T. Pohja, S. Launiainen, P. Hari, H. Mannila, M. Kulmala
Abstract. Atmospheric aerosol particle formation is frequently observed throughout the atmosphere, but despite various attempts of explanation, the processes behind it remain unclear. In this study...
Makkonen, R., Asmi, A., Korhonen, H., Kokkola, H., Järvenoja, S., Räisänen, P., ...
The global aerosol-climate model ECHAM5-HAM was modified to improve the representation of new particle formation in the boundary layer. Activation-type nucleation mechanism was introduced to produce...
Results of the first air ion spectrometer calibration and intercomparison workshop (2009)
E. Asmi, M. Sipilä, H. E. Manninen, J. Vanhanen, K. Lehtipalo, S. Gagné, ...
The Air Ion Spectrometer (AIS) measures mobility and size distributions of atmospheric ions. The Neutral cluster and Air Ion Spectrometer (NAIS) can additionally measure neutral particles. The number...
Negatively charged nanoparticles produced by splashing of water (2009)
H. Tammet, U. Hõrrak, M. Kulmala
The production of splashing-generated balloelectric intermediate ions was studied by means of mobility spectrometry in the atmosphere during the rain and in a laboratory experiment simulating the...
S. Buenrostro Mazon, I. Riipinen, D. M. Schultz, M. Valtanen, M. Dal Maso, L. Sogacheva, ...
Studies of secondary aerosol-particle formation depend on identifying days in which new particle formation occurs and, by comparing them to days with no signs of particle formation, identifying the...
Airborne measurements of nucleation mode particles II: boreal forest nucleation events (2009)
C. D. O'Dowd, Y. J. Yoon, W. Junkermann, P. Aalto, M. Kulmala, H. Lihavainen, ...
Airborne measurements of nucleation mode aerosol concentrations during nucleation events over the boreal forest of southern Finland are reported. Three case studies are analyzed in an attempt to...
R. Makkonen, A. Asmi, H. Korhonen, H. Kokkola, S. Järvenoja, P. Räisänen, ...
The global aerosol-climate model ECHAM5-HAM was modified to improve the representation of new particle formation in the boundary layer. Activation-type nucleation mechanism was introduced to produce...
Homogeneous vs. heterogeneous nucleation in water-dicarboxylic acid systems (2009)
A. I. Hienola, H. Vehkamäki, I. Riipinen, M. Kulmala
Binary heterogeneous nucleation of water-succinic/glutaric/malonic/adipic acid on nanometer-sized particles is investigated within the frame of classical heterogeneous nucleation theory. Homogeneous...
M. Kulmala, A. Asmi, H. K. Lappalainen, K. S. Carslaw, U. Pöschl, U. Baltensperger, ...
The European Aerosol Cloud Climate and Air Quality Interactions project EUCAARI is an EU Research Framework 6 integrated project focusing on understanding the interactions of climate and air...
Aerosol dynamics simulations on the connection of sulphuric acid and new particle formation (2009)
H. Vuollekoski, J. Leppä, I. Riipinen, H. Korhonen, ...
We have performed a series of simulations with an aerosol dynamics box model to study the connection between new particle formation and sulphuric acid concentration. For nucleation either activation...
I. Riipinen, H. E. Manninen, T. Yli-Juuti, M. Boy, M. Sipilä, M. Ehn, ...
Measurements on the composition of nanometer-sized atmospheric particles are the key to understand which vapors participate in the secondary aerosol formation processes. Knowledge on these processes...
M. Kulmala, A. Asmi, H. K. Lappalainen, K. S. Carslaw, U. Pöschl, U. Baltensperger, ...
No abstract available.
H. E. Manninen, T. Nieminen, I. Riipinen, T. Yli-Juuti, S. Gagné, E. Asmi, ...
Despite the fact that frequent aerosol formation has been observed in various locations in the atmosphere, the overall magnitude of the new particle formation as a particle source is still unclear....
K. Lehtipalo, M. Sipilä, I. Riipinen, T. Nieminen, M. Kulmala
We measured the size distribution of atmospheric neutral and charged clusters and particles down to mobility diameter around 1.5 nm by applying pulse-height CPC technique at SMEAR II station in...
T. Hussein, H. Junninen, P. Tunved, A. Kristensson, M. Dal Maso, I. Riipinen, ...
We investigated the time span and spatial scale of regional new particle formation (NPF) events in Finland and Southern Sweden using measured particle number size distributions at five background...
T. M. Ruuskanen, R. Taipale, J. Rinne, M. K. Kajos, H. Hakola, M. Kulmala
Atmospheric concentrations of volatile organic compounds (VOCs) vary diurnally, seasonally and annually. Therefore continuous long-term measurements are needed to properly describe the atmospheric...
T. Hussein, H. Junninen, P. Tunved, A. Kristensson, M. Dal Maso, I. Riipinen, ...
We investigated the time-span and spatial-scale of regional new particle formation (NPF) events in Finland and Southern Sweden using measured particle number size distributions at five background...
Ambient new particle formation parameter indicates potential rise in future events (2009)
B. Bonn, M. Boy, M. Kulmala, A. Groth, K. Trawny, S. Borchert, ...
Atmospheric new particle formation is a general phenomenon observed over coniferous forests. So far nucleation is described as a function of gaseous sulfuric acid concentration only, which is unable...
N. Kivekäs, J. Sun, M. Zhan, A. Hyvärinen, M. Komppula, ...
Particle number size distributions in size range 12–570nm were measured continuously at Mount Waliguan, a remote mountain-top station in inland China. The station is located at the altitude of 3816...
H. E. Manninen, T. Nieminen, I. Riipinen, T. Yli-Juuti, S. Gagné, E. Asmi, ...
Despite the fact that frequent aerosol formation has been observed in various locations in the atmosphere, the overall magnitude of the new particle formation as a particle source is still unclear....
H. K. Lappalainen, S. Sevanto, J. Bäck, T. M. Ruuskanen, P. Kolari, R. Taipale, ...
Atmospheric concentrations of methanol, acetaldehyde, acetone, isoprene and monoterpenes were measured using a PTR-MS (proton transfer reaction mass spectrometry) in a boreal forest site in...
Atmospheric aerosols in the earth system: a review of interactions and feedbacks (2009)
K. S. Carslaw, O. Boucher, D. V. Spracklen, G. W. Mann, S. Woodward, ...
The natural environment is a major source of atmospheric aerosols, including dust, secondary organic material from terrestrial biogenic emissions, carbonaceous particles from wildfires, and sulphate...
New particle formation and growth at a remote, sub-tropical coastal location (2009)
R. L. Modini, Z. D. Ristovski, G. R. Johnson, C. He, N. Surawski, L. Morawska, ...
A month-long intensive measurement campaign was conducted in March/April 2007 at Agnes Water, a remote coastal site just south of the Great Barrier Reef on the east coast of Australia. Particle and...
G. Eerdekens, N. Yassaa, V. Sinha, P. P. Aalto, V. Fiedler, H. Aufmhoff, ...
In this study we present measurements of selected trace gases and aerosol made in a boreal forest during the BACCI-QUEST IV intensive field campaign in Hyytiälä, Finland in April 2005. Several...
Cold oceans enhance terrestrial new-particle formation in near-coastal forests (2009)
T. Suni, L. Sogacheva, J. Lauros, H. Hakola, J. Bäck, T. Kurtén, ...
The world's forests produce atmospheric aerosol by emitting volatile organic compounds (VOC) which, after being oxidized in the atmosphere, readily condense on the omnipresent nanometer-sized...
Annual particle flux observations over a heterogeneous urban area (2009)
L. Järvi, Ü. Rannik, I. Mammarella, A. Sogachev, P. P. Aalto, P. Keronen, ...
Long-term eddy covariance (EC) particle number flux measurements for the size range 6 nm to 5 μm were performed at the SMEAR III station over urban area in Helsinki, Finland. Heterogeneous urban...
H. Kuuluvainen, J. Kannosto, A. Virtanen, J. M. Mäkelä, M. Kulmala, P. Aalto, ...
We investigate the suitability of ELPI for condensation sink and ion sink measurements. The aim is to find the simple calibration factors by which the measured ELPI currents can be converted to...
H. K. Lappalainen, S. Sevanto, J. Bäck, T. M. Ruuskanen, P. Kolari, R. Taipale, ...
Atmospheric concentrations of methanol, acetaldehyde, acetone, isoprene and monoterpenes were measured using PTR-MS (proton transfer reaction mass spectrometry) in a boreal forest site in Hyytiälä,...
N. Kivekäs, J. Sun, M. Zhan, A. Hyvärinen, M. Komppula, ...
Particle number size distributions in size range 12–570 nm were measured continuously at Mount Waliguan, a remote mountain-top station in inland China. The station is located at the altitude of...
The role of sulphates and organic vapours in new particle formation in a eucalypt forest (2009)
Z. D. Ristovski, T. Suni, M. Kulmala, M. Boy, N. K. Meyer, J. Duplissy, ...
The influence of biogenic particle formation on climate is a well recognized phenomenon. To understand the mechanisms underlying the biogenic particle formation, determining the chemical composition...
Airborne measurements of nucleation mode particles II: boreal forest nucleation events. (2009)
O'Dowd, C.D., Yoon, Y.J., Junkermann, W., Aalto, P., Kulmala, M., Lihavainen, H., ...
Atmospheric Chemistry and Physics, 9(2009) S.937-44
Sulfuric acid and OH concentrations in a boreal forest site (2009)
T. Petäjä, R. L. Mauldin, III, E. Kosciuch, J. McGrath, T. Nieminen, P. Paasonen, ...
As demonstrated in a number of investigations, gaseous sulfuric acid plays a central role in atmospheric aerosol formation. Using chemical ionization mass spectrometer the gas-phase sulfuric acid and...
New particle formation and growth at a remote, sub-tropical coastal location (2009)
R. L. Modini, Z. D. Ristovski, G. R. Johnson, C. He, N. Surawski, L. Morawska, ...
A month-long intensive measurement campaign was conducted in March/April 2007 at Agnes Water, a remote coastal site just south of the Great Barrier Reef on the east coast of Australia. Particle and...
Annual particle flux observations over a heterogeneous urban area (2009)
L. Järvi, Ü. Rannik, I. Mammarella, A. Sogachev, P. P. Aalto, P. Keronen, ...
Long-term eddy covariance particle number flux measurements for the diameter range 6 nm to 5 μm were performed at the SMEAR III station over an urban area in Helsinki, Finland. The heterogeneity of...
B. Bonn, M. Boy, M. Kulmala, A. Groth, K. Trawny, S. Borchert, ...
Atmospheric new particle formation is a general phenomenon observed over coniferous forests. So far nucleation is either parameterised as a function of gaseous sulphuric acid concentration only,...
New particle formation from the oxidation of direct emissions of pine seedlings (2009)
L. Q. Hao, P. Yli-Pirilä, P. Tiitta, S. Romakkaniemi, P. Vaattovaara, M. K. Kajos, ...
Measurements of particle formation following the gas phase oxidation of volatile organic compounds (VOCs) emitted by Scots pine (<i>Pinus sylvestris</i> L.) seedlings are reported....
Results from the CERN pilot CLOUD experiment (2009)
J. Duplissy, M. B. Enghoff, K. L. Aplin, F. Arnold, H. Aufmhoff, M. Avngaard, ...
During a 4-week run in October–November 2006, a pilot experiment was performed at the CERN Proton Synchrotron in preparation for the CLOUD<sup>1</sup> experiment, whose aim is to study...
Atmospheric sub-3 nm particles at high altitudes (2009)
S. Mirme, A. Mirme, A. Minikin, A. Petzold, U. Hõrrak, ...
Formation of new atmospheric aerosol particles is known to occur almost all over the world and the importance of these particles to climate and air quality has been recognized. Recently, it was found...
M. Kulmala, I. Riipinen, T. Nieminen, M. Hulkkonen, L. Sogacheva, H. E. Manninen, ...
Aerosol particles affect the Earth's radiative balance by directly scattering and absorbing solar radiation and, indirectly, through their activation into cloud droplets. Both effects are known with...
T. Raatikainen, P. Vaattovaara, P. Tiitta, P. Miettinen, J. Rautiainen, M. Ehn, ...
An Aerodyne quadrupole aerosol mass spectrometer (Q-AMS) was deployed in Hyytiälä, a forested rural measurement site in southern Finland, during a 2-week measurement campaign in spring 2005. Q-AMS...
Aerosol dynamics simulations on the connection of sulphuric acid and new particle formation (2008)
Vuollekoski, H., Leppä, J., Riipinen, I., Korhonen, H., ...
We have performed a series of simulations with an aerosol dynamics box model to study the connection between new particle formation and sulphuric acid concentration. For nucleation either activation...
Makkonen, R., Asmi, A., Korhonen, H., Kokkola, H., Järvenoja, S., Räisänen, P., ...
The global aerosol-climate model ECHAM5-HAM was modified to improve the representation of new particle formation in the boundary layer. Activation-type nucleation mechanism was introduced to produce...
Berndt, T., Stratmann, F., Bräsel, S., Heintzenberg, J., Laaksonen, A., Kulmala, M.
Mechanistic investigations of atmospheric H2SO4 particle formation have been performed in a laboratory study taking either H2SO4 from a liquid reservoir or using the gas-phase reaction of OH radicals...
Laaksonen, A., Kulmala, M., Berndt, T., Stratmann, F., Mikkonen, S., Ruuskanen, A., ...
Atmospheric new particle formation is generally thought to occur due to homogeneous or ion-induced nucleation of sulphuric acid. We compare ambient nucleation rates with laboratory data from...
Taipale, R., Ruuskanen, T. M., Rinne, J., Kajos, M. K., Hakola, H., Pohja, T., ...
Proton transfer reaction mass spectrometry (PTR-MS) is a technique for online measurements of atmospheric concentrations, or volume mixing ratios, of volatile organic compounds (VOCs). The aim of...
Timonen, H., Saarikoski, S., Tolonen-Kivimäki, O., Aurela, M., Saarnio, K., Petäjä, T., ...
This paper represents the results of one year long measurement period of the size distributions of water-soluble organic carbon (WSOC), inorganic ions and gravimetric mass of particulate matter....
Kurtén, T., Loukonen, V., Vehkamäki, H., Kulmala, M.
We have studied the structure and formation thermodynamics of dimer clusters containing H2SO4 or HSO4? together with ammonia and seven different amines possibly present in the atmosphere, using the...
Mode resolved density of atmospheric aerosol particles (2008)
Kannosto, J., Lemmetty, M., Virtanen, A., Mäkelä, J. M., Keskinen, J., Junninen, H., ...
In this study, we investigate the mode resolved density of ultrafine atmospheric particles measured in boreal forest environment. The method used here enables us to find the distinct density...
Laakso, L., Laakso, H., Aalto, P. P., Keronen, P., Petäjä, T., Nieminen, T., ...
We have analyzed one year (July 2006?July 2007) of measurement data from a relatively clean background site located in dry savannah in South Africa. The annual-median trace gas concentrations were...
The role of ammonia in sulfuric acid ion induced nucleation (2008)
Ortega, I. K., Kurtén, T., Vehkamäki, H., Kulmala, M.
We have developed a new multi-step strategy for quantum chemical calculations on atmospherically relevant cluster structures that makes calculation for large clusters affordable with a good...
Airborne measurements of nucleation mode particles II: boreal forest nucleation events (2008)
O'Dowd, C. D., Yoon, Y. J., Junkerman, W., Aalto, P., Kulmala, M., Lihavainen, H., ...
Airborne measurements of nucleation mode aerosol concentrations during nucleation events over the boreal forest of southern Finland are reported. Three case studies are analysis in an attempt to...
Applicability of condensation particle counters to measure atmospheric clusters (2008)
Sipilä, M., Lehtipalo, K., Kulmala, M., Petäjä, T., Junninen, H., Aalto, P. P., ...
The ambient and laboratory molecular and ion clusters were investigated. Here we present data on the ambient concentrations of both charged and uncharged molecular clusters as well as the performance...
The role of ammonia in sulfuric acid ion induced nucleation (2008)
Ortega, I. K., Kurtén, T., Vehkamäki, H., Kulmala, M.
We have developed a new multi-step strategy for quantum chemical calculations on atmospherically relevant cluster structures that makes calculation for large clusters affordable with a good...
The role of VOC oxidation products in continental new particle formation (2008)
Laaksonen, A., Kulmala, M., O'Dowd, C. D., Joutsensaari, J., Vaattovaara, P., Mikkonen, S., ...
Aerosol physical and chemical properties and trace gas concentrations were measured during the QUEST field campaign in March?April 2003, in Hyytiälä, Finland. Our aim was to understand the role of...
SALSA ? a Sectional Aerosol module for Large Scale Applications (2008)
Kokkola, H., Korhonen, H., Lehtinen, K. E. J., Makkonen, R., Asmi, A., Järvenoja, S., ...
The sectional aerosol module SALSA is introduced. The model has been designed to be implemented in large scale climate models, which require both accuracy and computational efficiency. We have used...
New particle formation in the Front Range of the Colorado Rocky Mountains (2008)
Boy, M., Karl, T., Turnipseed, A., Mauldin, R. L., Kosciuch, E., Greenberg, J., ...
New particle formation is of interest because of its influence on the properties of aerosol population, and due to the possible contribution of newly formed particles to cloud condensation nuclei....
Järvi, L., Junninen, H., Karppinen, A., Hillamo, R., Virkkula, A., Mäkelä, T., ...
Variations in black carbon (BC) concentrations over different timescales, including annual, weekly and diurnal changes, were studied during ten years in Helsinki, Finland. Measurements were made in...
Variation and balance of positive air ion concentrations in a boreal forest (2008)
Hõrrak, U., Aalto, P. P., Salm, J., Komsaare, K., Tammet, H., Mäkelä, J. M., ...
Air ions are characterized on the basis of measurements carried out in a boreal forest at the Hyytiälä SMEAR station, Finland, during the BIOFOR III campaign in spring 1999. The air ions were...
Suni, T., Kulmala, M., Hirsikko, A., Bergman, T., Laakso, L., Aalto, P. P., ...
Biogenic aerosol formation is likely to contribute significantly to the global aerosol load. In recent years, new-particle formation has been observed in various ecosystems around the world but...
Aerosol dynamics simulations on the connection of sulphuric acid and new particle formation (2008)
Vuollekoski, H., Leppä, J., Riipinen, I., Korhonen, H., ...
We have performed a series of simulations with an aerosol dynamics box model to study the connection between new particle formation and sulphuric acid concentration. For nucleation either activation...
Makkonen, R., Asmi, A., Korhonen, H., Kokkola, H., Järvenoja, S., Räisänen, P., ...
The global aerosol-climate model ECHAM5-HAM was modified to improve the representation of new particle formation in the boundary layer. Activation-type nucleation mechanism was introduced to produce...
Berndt, T., Stratmann, F., Bräsel, S., Heintzenberg, J., Laaksonen, A., Kulmala, M.
Mechanistic investigations of atmospheric H2SO4 particle formation have been performed in a laboratory study taking either H2SO4 from a liquid reservoir or using the gas-phase reaction of OH radicals...
Laaksonen, A., Kulmala, M., Berndt, T., Stratmann, F., Mikkonen, S., Ruuskanen, A., ...
Atmospheric new particle formation is generally thought to occur due to homogeneous or ion-induced nucleation of sulphuric acid. We compare ambient nucleation rates with laboratory data from...
Taipale, R., Ruuskanen, T. M., Rinne, J., Kajos, M. K., Hakola, H., Pohja, T., ...
Proton transfer reaction mass spectrometry (PTR-MS) is a technique for online measurements of atmospheric concentrations, or volume mixing ratios, of volatile organic compounds (VOCs). The aim of...
Timonen, H., Saarikoski, S., Tolonen-Kivimäki, O., Aurela, M., Saarnio, K., Petäjä, T., ...
This paper represents the results of one year long measurement period of the size distributions of water-soluble organic carbon (WSOC), inorganic ions and gravimetric mass of particulate matter....
Kurtén, T., Loukonen, V., Vehkamäki, H., Kulmala, M.
We have studied the structure and formation thermodynamics of dimer clusters containing H2SO4 or HSO4? together with ammonia and seven different amines possibly present in the atmosphere, using the...
Mode resolved density of atmospheric aerosol particles (2008)
Kannosto, J., Lemmetty, M., Virtanen, A., Mäkelä, J. M., Keskinen, J., Junninen, H., ...
In this study, we investigate the mode resolved density of ultrafine atmospheric particles measured in boreal forest environment. The method used here enables us to find the distinct density...
Laakso, L., Laakso, H., Aalto, P. P., Keronen, P., Petäjä, T., Nieminen, T., ...
We have analyzed one year (July 2006?July 2007) of measurement data from a relatively clean background site located in dry savannah in South Africa. The annual-median trace gas concentrations were...
The role of ammonia in sulfuric acid ion induced nucleation (2008)
Ortega, I. K., Kurtén, T., Vehkamäki, H., Kulmala, M.
We have developed a new multi-step strategy for quantum chemical calculations on atmospherically relevant cluster structures that makes calculation for large clusters affordable with a good...
Airborne measurements of nucleation mode particles II: boreal forest nucleation events (2008)
O'Dowd, C. D., Yoon, Y. J., Junkerman, W., Aalto, P., Kulmala, M., Lihavainen, H., ...
Airborne measurements of nucleation mode aerosol concentrations during nucleation events over the boreal forest of southern Finland are reported. Three case studies are analysis in an attempt to...
Applicability of condensation particle counters to measure atmospheric clusters (2008)
Sipilä, M., Lehtipalo, K., Kulmala, M., Petäjä, T., Junninen, H., Aalto, P. P., ...
The ambient and laboratory molecular and ion clusters were investigated. Here we present data on the ambient concentrations of both charged and uncharged molecular clusters as well as the performance...
The role of ammonia in sulfuric acid ion induced nucleation (2008)
Ortega, I. K., Kurtén, T., Vehkamäki, H., Kulmala, M.
We have developed a new multi-step strategy for quantum chemical calculations on atmospherically relevant cluster structures that makes calculation for large clusters affordable with a good...
The role of VOC oxidation products in continental new particle formation (2008)
Laaksonen, A., Kulmala, M., O'Dowd, C. D., Joutsensaari, J., Vaattovaara, P., Mikkonen, S., ...
Aerosol physical and chemical properties and trace gas concentrations were measured during the QUEST field campaign in March?April 2003, in Hyytiälä, Finland. Our aim was to understand the role of...
SALSA ? a Sectional Aerosol module for Large Scale Applications (2008)
Kokkola, H., Korhonen, H., Lehtinen, K. E. J., Makkonen, R., Asmi, A., Järvenoja, S., ...
The sectional aerosol module SALSA is introduced. The model has been designed to be implemented in large scale climate models, which require both accuracy and computational efficiency. We have used...
New particle formation in the Front Range of the Colorado Rocky Mountains (2008)
Boy, M., Karl, T., Turnipseed, A., Mauldin, R. L., Kosciuch, E., Greenberg, J., ...
New particle formation is of interest because of its influence on the properties of aerosol population, and due to the possible contribution of newly formed particles to cloud condensation nuclei....
Järvi, L., Junninen, H., Karppinen, A., Hillamo, R., Virkkula, A., Mäkelä, T., ...
Variations in black carbon (BC) concentrations over different timescales, including annual, weekly and diurnal changes, were studied during ten years in Helsinki, Finland. Measurements were made in...
Variation and balance of positive air ion concentrations in a boreal forest (2008)
Hõrrak, U., Aalto, P. P., Salm, J., Komsaare, K., Tammet, H., Mäkelä, J. M., ...
Air ions are characterized on the basis of measurements carried out in a boreal forest at the Hyytiälä SMEAR station, Finland, during the BIOFOR III campaign in spring 1999. The air ions were...
Suni, T., Kulmala, M., Hirsikko, A., Bergman, T., Laakso, L., Aalto, P. P., ...
Biogenic aerosol formation is likely to contribute significantly to the global aerosol load. In recent years, new-particle formation has been observed in various ecosystems around the world but...
The role of VOC oxidation products in continental new particle formation (2008)
Laaksonen, A., Kulmala, M., O'Dowd, C. D., Joutsensaari, J., Vaattovaara, P., Mikkonen, S., ...
Flood or drought: How do aerosols affect precipitation? (2008)
Rosenfeld, D., Lohmann, U., Raga, G. B., O'Dowd, C. D., Kulmala, M., Fuzzi, S., ...
Applicability of condensation particle counters to measure atmospheric clusters (2008)
Sipilä, M., Lehtipalo, K., Kulmala, M., Petäjä, T., Junninen, H., Aalto, P. P., ...
T. Suni, M. Kulmala, A. Hirsikko, T. Bergman, L. Laakso, P. P. Aalto, ...
Biogenic aerosol formation is likely to contribute significantly to the global aerosol load. In recent years, new-particle formation has been observed in various ecosystems around the world but...
Variation and balance of positive air ion concentrations in a boreal forest (2008)
U. Hõrrak, P. P. Aalto, J. Salm, K. Komsaare, H. Tammet, J. M. Mäkelä, ...
Air ions are characterized on the basis of measurements carried out in a boreal forest at the Hyytiälä SMEAR station, Finland, during the BIOFOR III campaign in spring 1999. The air ions were...
L. Järvi, H. Junninen, A. Karppinen, R. Hillamo, A. Virkkula, T. Mäkelä, ...
Variations in black carbon (BC) concentrations over different timescales, including annual, weekly and diurnal changes, were studied during ten years in Helsinki, Finland. Measurements were made in...
New particle formation in the Front Range of the Colorado Rocky Mountains (2008)
M. Boy, T. Karl, A. Turnipseed, R. L. Mauldin, E. Kosciuch, J. Greenberg, ...
New particle formation is of interest because of its influence on the properties of aerosol population, and due to the possible contribution of newly formed particles to cloud condensation nuclei....
SALSA ─ a Sectional Aerosol module for Large Scale Applications (2008)
H. Kokkola, H. Korhonen, R. Makkonen, A. Asmi, S. Järvenoja, ...
The sectional aerosol module SALSA is introduced. The model has been designed to be implemented in large scale climate models, which require both accuracy and computational efficiency. We have used...
The role of VOC oxidation products in continental new particle formation (2008)
A. Laaksonen, M. Kulmala, C. D. O'Dowd, J. Joutsensaari, P. Vaattovaara, S. Mikkonen, ...
Aerosol physical and chemical properties and trace gas concentrations were measured during the QUEST field campaign in March–April 2003, in Hyytiälä, Finland. Our aim was to understand the...
The role of ammonia in sulfuric acid ion induced nucleation (2008)
I. K. Ortega, T. Kurtén, H. Vehkamäki, M. Kulmala
We have developed a new multi-step strategy for quantum chemical calculations on atmospherically relevant cluster structures that makes calculation for large clusters affordable with a good...
Applicability of condensation particle counters to measure atmospheric clusters (2008)
M. Sipilä, K. Lehtipalo, M. Kulmala, T. Petäjä, H. Junninen, P. P. Aalto, ...
This study presents an evaluation of a pulse height condensation particle counter (PH-CPC) and an expansion condensation particle counter (E-CPC) in terms of measuring ambient and...
T. Kurtén, V. Loukonen, H. Vehkamäki, M. Kulmala
We have studied the structure and formation thermodynamics of dimer clusters containing H<sub>2</sub>SO<sub>4</sub> or...
L. Laakso, H. Laakso, P. P. Aalto, P. Keronen, T. Petäjä, T. Nieminen, ...
We have analyzed one year (July 2006–July 2007) of measurement data from a relatively clean background site located in dry savannah in South Africa. The annual-median trace gas concentrations were...
L. H. Young, D. R. Benson, F. R. Kameel, J. R. Pierce, H. Junninen, M. Kulmala, ...
Binary homogeneous nucleation (BHN) of sulphuric acid and water (H2SO4/H2O) is one of the most important atmospheric nucleation processes, but laboratory observations of this nucleation process are...
Mode resolved density of atmospheric aerosol particles (2008)
J. Kannosto, A. Virtanen, M. Lemmetty, J. M. Mäkelä, J. Keskinen, H. Junninen, ...
In this study, we investigate the mode resolved density of ultrafine atmospheric particles measured in boreal forest environment. The method used here enables us to find the distinct density...
H. Timonen, S. Saarikoski, O. Tolonen-Kivimäki, M. Aurela, K. Saarnio, T. Petäjä, ...
This paper represents the results of one year long measurement period of the size distributions of water-soluble organic carbon (WSOC), inorganic ions and gravimetric mass of particulate matter....
T. Berndt, F. Stratmann, S. Bräsel, J. Heintzenberg, A. Laaksonen, M. Kulmala
Mechanistic investigations of atmospheric H<sub>2</sub>SO<sub>4</sub> particle formation have been performed in a laboratory study taking either...
R. Taipale, T. M. Ruuskanen, J. Rinne, M. K. Kajos, H. Hakola, T. Pohja, ...
Proton transfer reaction mass spectrometry (PTR-MS) is a technique for online measurements of atmospheric concentrations, or volume mixing ratios, of volatile organic compounds (VOCs). This paper...
H. Lihavainen, M. Komppula, J. Laakia, S. Saarikoski, ...
Physical and chemical properties of boundary layer clouds, together with relevant aerosol properties, were investigated during the first Pallas Cloud Experiment (First Pace) conducted in northern...
A. Laaksonen, M. Kulmala, T. Berndt, F. Stratmann, S. Mikkonen, A. Ruuskanen, ...
Atmospheric new particle formation is generally thought to occur due to homogeneous or ion-induced nucleation of sulphuric acid. We compare ambient nucleation rates with laboratory data from...
T. Berndt, F. Stratmann, S. Bräsel, J. Heintzenberg, A. Laaksonen, M. Kulmala
Mechanistic investigations of atmospheric H2SO4 particle formation have been performed in a laboratory study taking either H2SO4 from a liquid reservoir or using the gas-phase reaction of OH radicals...
R. Taipale, T. M. Ruuskanen, J. Rinne, M. K. Kajos, H. Hakola, T. Pohja, ...
Proton transfer reaction mass spectrometry (PTR-MS) is a technique for online measurements of atmospheric concentrations, or volume mixing ratios, of volatile organic compounds (VOCs). This paper...
A. Laaksonen, M. Kulmala, T. Berndt, F. Stratmann, S. Mikkonen, A. Ruuskanen, ...
Atmospheric new particle formation is generally thought to occur due to homogeneous or ion-induced nucleation of sulphuric acid. We compare ambient nucleation rates with laboratory data from...
Airborne measurements of nucleation mode particles II: boreal forest nucleation events (2008)
C. D. O'Dowd, Y. J. Yoon, W. Junkerman, P. Aalto, M. Kulmala, H. Lihavainen, ...
Airborne measurements of nucleation mode aerosol concentrations during nucleation events over the boreal forest of southern Finland are reported. Three case studies are analysis in an attempt to...
Applicability of condensation particle counters to measure atmospheric clusters (2008)
M. Sipilä, K. Lehtipalo, M. Kulmala, T. Petäjä, H. Junninen, P. P. Aalto, ...
The ambient and laboratory molecular and ion clusters were investigated. Here we present data on the ambient concentrations of both charged and uncharged molecular clusters as well as the performance...
The role of ammonia in sulfuric acid ion induced nucleation (2008)
I. K. Ortega, T. Kurtén, H. Vehkamäki, M. Kulmala
We have developed a new multi-step strategy for quantum chemical calculations on atmospherically relevant cluster structures that makes calculation for large clusters affordable with a good...
L. Laakso, H. Laakso, P. P. Aalto, P. Keronen, T. Petäjä, T. Nieminen, ...
We have analyzed one year (July 2006–July 2007) of measurement data from a relatively clean background site located in dry savannah in South Africa. The annual-median trace gas concentrations...
Mode resolved density of atmospheric aerosol particles (2008)
J. Kannosto, M. Lemmetty, A. Virtanen, J. M. Mäkelä, J. Keskinen, H. Junninen, ...
In this study, we investigate the mode resolved density of ultrafine atmospheric particles measured in boreal forest environment. The method used here enables us to find the distinct density...
T. Kurtén, V. Loukonen, H. Vehkamäki, M. Kulmala
We have studied the structure and formation thermodynamics of dimer clusters containing H<sub>2</sub>SO<sub>4</sub> or...
H. Timonen, S. Saarikoski, O. Tolonen-Kivimäki, M. Aurela, K. Saarnio, T. Petäjä, ...
This paper represents the results of one year long measurement period of the size distributions of water-soluble organic carbon (WSOC), inorganic ions and gravimetric mass of particulate matter....
R. Taipale, T. M. Ruuskanen, J. Rinne, M. K. Kajos, H. Hakola, T. Pohja, ...
Proton transfer reaction mass spectrometry (PTR-MS) is a technique for online measurements of atmospheric concentrations, or volume mixing ratios, of volatile organic compounds (VOCs). The aim of...
A. Laaksonen, M. Kulmala, T. Berndt, F. Stratmann, S. Mikkonen, A. Ruuskanen, ...
Atmospheric new particle formation is generally thought to occur due to homogeneous or ion-induced nucleation of sulphuric acid. We compare ambient nucleation rates with laboratory data from...
T. Berndt, F. Stratmann, S. Bräsel, J. Heintzenberg, A. Laaksonen, M. Kulmala
Mechanistic investigations of atmospheric H<sub>2</sub>SO<sub>4</sub> particle formation have been performed in a laboratory study taking either...
R. Makkonen, A. Asmi, H. Korhonen, H. Kokkola, S. Järvenoja, P. Räisänen, ...
The global aerosol-climate model ECHAM5-HAM was modified to improve the representation of new particle formation in the boundary layer. Activation-type nucleation mechanism was introduced to produce...
Aerosol dynamics simulations on the connection of sulphuric acid and new particle formation (2008)
H. Vuollekoski, J. Leppä, I. Riipinen, H. Korhonen, ...
We have performed a series of simulations with an aerosol dynamics box model to study the connection between new particle formation and sulphuric acid concentration. For nucleation either activation...
S. Buenrostro Mazon, I. Riipinen, D. M. Schultz, M. Valtanen, M. Dal Maso, L. Sogacheva, ...
Studies of secondary aerosol-particle formation depend on identifying days in which new particle formation occurs and, by comparing them to days with no signs of particle formation, identifying the...
H. Lihavainen, M. Komppula, J. Laakia, S. Saarikoski, ...
Physical and chemical properties of boundary layer clouds, together with relevant aerosol properties, were investigated during the first Pallas Cloud Experiment (First PaCE) conducted in northern...
I. Riipinen, H. E. Manninen, T. Yli-Juuti, M. Boy, M. Sipilä, M. Ehn, ...
Measurements on the composition of nanometer-sized atmospheric particles are the key to understand which vapors participate in the secondary aerosol formation processes. Knowledge on these processes...
Negatively charged nanoparticles produced by splashing of water (2008)
H. Tammet, U. Hõrrak, M. Kulmala
The production of splashing-generated balloelectric intermediate ions was studied by means of mobility spectrometry in the atmosphere during the rain and in a laboratory experiment simulating the...
Results of the first air ion spectrometer calibration and intercomparison workshop (2008)
E. Asmi, M. Sipilä, H. E. Manninen, J. Vanhanen, K. Lehtipalo, S. Gagné, ...
The air ion spectrometer (AIS) measures mobility and size distributions of atmospheric ions. The neutral air ion spectrometer (NAIS) can additionally measure neutral particles. The number of the...
Homogeneous vs. heterogeneous nucleation in water-dicarboxylic acid systems (2008)
A. I. Hienola, H. Vehkamäki, I. Riipinen, M. Kulmala
Binary heterogeneous nucleation of water-succinic/glutaric/malonic/adipic acid on nanometer-sized particles is investigated within the frame of classical heterogeneous nucleation theory. Homogeneous...
M. Rinaldi, M. C. Facchini, S. Decesari, C. Carbone, E. Finessi, M. Mircea, ...
In order to achieve a better understanding of the modifications of the physical and chemical properties of marine aerosol particles during transport from offshore to the coast, size distribution and...
M. Kulmala, A. Asmi, H. K. Lappalainen, K. S. Carslaw, U. Pöschl, U. Baltensperger, ...
The European Aerosol Cloud Climate and Air Quality Interactions project EUCAARI is an EU Research Framework 6 integrated project focusing on understanding the interactions of climate and air...
Sulfuric acid and OH concentrations in a boreal forest site (2008)
T. Petäjä, R. L. Mauldin, III, E. Kosciuch, J. McGrath, T. Nieminen, M. Boy, ...
As demonstrated in a number of investigations, gaseous sulfuric acid plays a central role in atmospheric aerosol formation. Using chemical ionization mass spectrometer the gas-phase sulfuric acid and...
K. Lehtipalo, M. Sipilä, I. Riipinen, T. Nieminen, M. Kulmala
We measured the size distribution of atmospheric neutral and charged clusters and particles down to mobility diameter around 1.5 nm by applying pulse-height CPC technique at SMEAR II station in...
R. Taipale, T. M. Ruuskanen, J. Rinne, M. K. Kajos, H. Hakola, T. Pohja, ...
Proton transfer reaction mass spectrometry (PTR-MS) is a technique for online measurements of atmospheric concentrations, or volume mixing ratios, of volatile organic compounds (VOCs). The aim of...
A. Laaksonen, M. Kulmala, T. Berndt, F. Stratmann, S. Mikkonen, A. Ruuskanen, ...
Atmospheric new particle formation is generally thought to occur due to homogeneous or ion-induced nucleation of sulphuric acid. We compare ambient nucleation rates with laboratory data from...
T. Berndt, F. Stratmann, S. Bräsel, J. Heintzenberg, A. Laaksonen, M. Kulmala
Mechanistic investigations of atmospheric H2SO4 particle formation have been performed in a laboratory study taking either H2SO4 from a liquid reservoir or using the gas-phase reaction of OH radicals...
Airborne measurements of nucleation mode particles II: boreal forest nucleation events. (2008)
O'Dowd, C.D., Yoon, Y.J., Junkermann, W., Aalto, P., Kulmala, M., Lihavainen, H., ...
Atmospheric Chemistry and Physics Discussions, 8(2008) S.2821-48
The role of VOC oxidation products in continental new particle formation. (2008)
Laaksonen, A., Kulmala, M., O'Dowd, C.D., Joutsensaari, J., Vaattovaara, P., Mikkonen, S., ...
Atmospheric Chemistry and Physics, 8(2008) S.2657-65
Hussein, T., Kukkonen, J., Korhonen, H., Pohjola, M., Pirjola, L., Wraith, Darren, ...
This study presents an evaluation and modeling exercise of the size fractionated aerosol particle number concentrations measured nearby a major road in Helsinki during 23 August–19 September 2003...
Ehn, Mikael, Petäjä, T., Aufmhoff, Heinfried, Aalto, Pasi, Hämeri, K., Arnold, Frank, ...
The hygroscopic growth of aerosol particles present in a boreal forest was measured at a relative humidity of 88%. Simultaneously the gas phase concentration of sulfuric acid, a very hygroscopic...
Riipinen, I., Kulmala, M., Arnold, Frank, Dal Maso, M., Birmili, W., ...
This study investigates the connections between atmospheric sulphuric acid and new particle formation during QUEST III and BACCI/QUEST IV campaigns. The campaigns have been conducted in Heidelberg...
T. Petäjä, M. Dal Maso, H. Junninen, I. K. Koponen, T. Hussein, ...
The properties of atmospheric aerosol particles in Marseille and Athens were investigated. The studies were performed in Marseille, France, during July 2002 and in Athens, Greece, during June 2003....
T. Kurtén, L. Torpo, M. R. Sundberg, H. Vehkamäki, M. Kulmala
We study the ammonia addition reactions of H2SO4·NH3 molecular clusters containing up to four ammonia and two sulfuric acid molecules using the ab initio method RI-MP2 (Resolution of Identity...
Ehn, M., Petaja, T., Aufmhoff, H., Aalto, P., Hameri, K., Arnold, F., ...
SALSA ? a Sectional Aerosol module for Large Scale Applications (2007)
Kokkola, H., Korhonen, H., Lehtinen, K. E. J., Makkonen, R., Asmi, A., Järvenoja, S., ...
The sectional aerosol module SALSA is introduced. The model has been designed to be implemented in large scale climate models, which require both accuracy and computational efficiency. We have used...
New particle formation in the front range of the Colorado Rocky Mountains (2007)
Boy, M., Karl, T., Turnipseed, A., Mauldin, R. L., Kosciuch, E., Greenberg, J., ...
New particle formation is of interest because of its influence on the properties of aerosol population, and due to the possible contribution of newly formed particles to cloud condensation nuclei....
Black carbon concentration trends in Helsinki during 1996?2005 (2007)
Järvi, L., Junninen, H., Karppinen, A., Hillamo, R., Virkkula, A., Mäkelä, T., ...
The black carbon (BC) concentration trends were studied during ten years in Helsinki, Finland. Measurements were made in three campaigns between 1996 and 2005 at an urban area locating two kilometres...
Suni, T., Kulmala, M., Hirsikko, A., Bergman, T., Laakso, L., Aalto, P. P., ...
Biogenic aerosol formation is likely to contribute significantly to the global aerosol load. In recent years, new-particle formation (NPF) has been observed in various ecosystems around the world but...
Characterization of positive air ions in boreal forest air at the Hyytiälä SMEAR station (2007)
Hõrrak, U., Aalto, P. P., Salm, J., Komsaare, K., Tammet, H., Mäkelä, J. M., ...
The behavior of the concentration of positive small (or cluster) air ions and naturally charged nanometer aerosol particles (aerosol ions) has been studied on the basis of measurements carried out in...
The role of VOC oxidation products in continental new particle formation (2007)
Laaksonen, A., Kulmala, M., O'Dowd, C. D., Joutsensaari, J., Vaattovaara, P., Mikkonen, S., ...
Aerosol physical and chemical properties and trace gas concentrations were measured during the QUEST field campaign in March?April, 2003, in Hyytiälä, Finland. Our aim was to understand the role of...
Contribution of mixing in the ABL to new particle formation based on some observations (2007)
Lauros, J., Nilsson, E. D., Dal Maso, M., Kulmala, M.
The connection between new particle formation and micro- and mesoscale meteorology was studied based on measurements at SMEAR II station in Southern Finland. We analyzed turbulent conditions...
Chemical composition of atmospheric aerosols between Moscow and Vladivostok (2007)
Kuokka, S., Teinilä, K., Saarnio, K., Aurela, M., Sillanpää, M., Hillamo, R., ...
The TROICA-9 expedition (Trans-Siberian Observations Into the Chemistry of the Atmosphere) was carried out at the Trans-Siberian railway between Moscow and Vladivostok in October 2005. Measurements...
Hussein, T., Kukkonen, J., Korhonen, H., Pohjola, M., Pirjola, L., Wraith, D., ...
This study presents an evaluation and modeling of the size fractionated aerosol number concentrations that were measured near a major road of Itäväylä in Helsinki, during 23 August ? 19 September...
Bonn, B., Korhonen, H., Petäjä, T., Boy, M., Kulmala, M.
This study focusses on the description of the nucleation process observed during the ozone reaction of the biogenic monoterpene ?-pinene in smog chambers. Therefore, a detailed aerosol dynamics model...
Kurtén, T., Torpo, L., Sundberg, M. R., Vehkamäki, H., Kulmala, M.
We study the ammonia addition reactions of H2SO4·NH3 molecular clusters containing up to four ammonia and two sulfuric acid molecules using the ab initio method RI-MP2 (Resolution of Identity 2nd...
Hydrocarbon fluxes above a Scots pine forest canopy: Measurements and modeling (2007)
Rinne, J., Taipale, R., Markkanen, T., Ruuskanen, T. M., Hellén, H., Kajos, M. K., ...
We measured the fluxes of several hydrocarbon species above a Scots pine (Pinus sylvestris) stand using disjunct eddy covariance technique with proton transfer reaction ? mass spectrometry. The...
Damski, J., Thölix, L., Backman, L., Kaurola, J., Taalas, P., Austin, J., ...
A Global 40-year simulation from 1980 to 2019 was performed with the FinROSE chemistry-transport model based on the use of coupled chemistry GCM-data. The main focus of our analysis is on...
Ruuskanen, T. M., Kaasik, M., Aalto, P. P., Hõrrak, U., Vana, M., Mårtensson, M., ...
The LAPBIAT measurement campaign took place in the SMEAR I measurement station located in Eastern Lapland in the spring of 2003 between 26 April and 11 May. In this paper we describe the measurement...
Kuokka, S., Teinilä, K., Saarnio, K., Aurela, M., Sillanpää, M., Hillamo, R., ...
The TROICA-9 expedition (Trans-Siberian Observations Into the Chemistry of the Atmosphere) was carried out at the Trans-Siberian railway between Moscow and Vladivostok in October 2005. Measurements...
Contribution of mixing in the ABL to new particle formation based on observations (2007)
Lauros, J., Nilsson, E. D., Dal Maso, M., Kulmala, M.
The connection between new particle formation and micro- and mesoscale meteorology was studied based on measurements at SMEAR II station in Southern Finland. We analyzed turbulent conditions...
Hussein, T., Kukkonen, J., Korhonen, H., Pohjola, M., Pirjola, L., Wraith, D., ...
This study presents an evaluation and modeling exercise of the size fractionated aerosol particle number concentrations measured nearby a major road in Helsinki during 23 August?19 September 2003 and...
Ruuskanen, T. M., Kaasik, M., Aalto, P. P., Hõrrak, U., Vana, M., Mårtensson, M., ...
The LAPBIAT measurement campaign took place in the Värriö SMEAR I measurement station located in Eastern Lapland in the spring of 2003 between 26 April and 11 May. In this paper we describe the...
Hydrocarbon fluxes above a Scots pine forest canopy: measurements and modeling (2007)
Rinne, J., Taipale, R., Markkanen, T., Ruuskanen, T. M., Hellén, H., Kajos, M. K., ...
We measured the fluxes of several hydrocarbon species above a Scots pine (Pinus sylvestris) stand using disjunct eddy covariance technique with proton transfer reaction ? mass spectrometry. The...
Ambient sesquiterpene concentration and its link to air ion measurements (2007)
Bonn, B., Hirsikko, A., Hakola, H., Kurtén, T., Laakso, L., Boy, M., ...
Ambient air ion size distributions have been measured continuously at the Finnish boreal forest site in Hyytiälä since spring 2003. In general, these measurements show a maximum of air ions below...
Kurtén, T., Torpo, L., Sundberg, M. R., Vehkamäki, H., Kulmala, M.
We study the ammonia addition reactions of H2SO4·NH3 molecular clusters containing up to four ammonia and two sulfuric acid molecules using the ab initio method RI-MP2 (Resolution of Identity 2nd...
Waterfalls as sources of small charged aerosol particles (2007)
Laakso, L., Hirsikko, A., Grönholm, T., Kulmala, M., Luts, A.
In this study, we measured the mobility distributions of cluster and intermediate ions with an ion spectrometer near a waterfall. We observed that the concentration of negative 1.5?10 nm ions was...
Damski, J., Thölix, L., Backman, L., Kaurola, J., Taalas, P., Austin, J., ...
A global 40-year simulation from 1980 to 2019 was performed with the FinROSE chemistry-transport model based on the use of coupled chemistry GCM-data. The main focus of our analysis is on...
Riipinen, I., Kulmala, M., Arnold, F., Dal Maso, M., Birmili, W., ...
This study investigates the connections between atmospheric sulphuric acid and new particle formation during QUEST III and BACCI/QUEST IV campaigns. The campaigns have been conducted in Heidelberg...
Haapanala, S., Rinne, J., Hakola, H., Hellén, H., Laakso, L., Lihavainen, H., ...
Boundary layer concentrations of several volatile organic compounds (VOC) were measured during two campaigns in springs of 2003 and 2006. The measurements were conducted over boreal landscapes near...
Airborne measurements of nucleation mode particles I: coastal nucleation and growth rates (2007)
O'Dowd, C. D., Yoon, Y. J., Junkerman, W., Aalto, P., Kulmala, M., Lihavainen, H., ...
A light aircraft was equipped with a bank of Condensation Particle Counters (CPCs) (50% cut from 3?5.4?9.6 nm) and a nano-Scanning Mobility Particle Sizer (nSMPS) and deployed along the west coast of...
Laakso, L., Gagné, S., Petäjä, T., Hirsikko, A., Aalto, P. P., Kulmala, M., ...
The importance of ion-induced nucleation in the lower atmosphere has been discussed for a long time. In this article we describe a new instrumental setup ? Ion-DMPS ? which can be used to detect...
Sogacheva, L., Hamed, A., Facchini, M. C., Kulmala, M., Laaksonen, A.
In this paper, we study the transport of air masses to San Pietro Capofiume (SPC) in Po Valley, Italy, by means of back trajectories analysis. Our main aim is to investigate whether air masses...
Non-volatile residuals of newly formed atmospheric particles in the boreal forest (2007)
Ehn, M., Petäjä, T., Birmili, W., Junninen, H., Aalto, P., Kulmala, M.
The volatility of sub-micrometer atmospheric aerosol particles was studied in a rural background environment in Finland using a combination of a heating tube and a scanning mobility particle sizer....
Nucleation and growth of new particles in Po Valley, Italy (2007)
Hamed, A., Joutsensaari, J., Mikkonen, S., Sogacheva, L., Dal Maso, M., Kulmala, M., ...
Aerosol number distribution measurements are reported at San Pietro Capofiume (SPC) station (44°39' N, 11°37' E) for the time period 2002?2005. The station is located in Po Valley, the largest...
Technical Note: The heterogeneous Zeldovich factor (2007)
Vehkamäki, H., Määttänen, A., Lauri, A., Napari, I., Kulmala, M.
In this technical note we present the exact form of the Zeldovich factor for heterogeneous nucleation on spherical pre-existing particles. We study the error caused by planar pre-existing surface...
Ehn, M., Petäjä, T., Aufmhoff, H., Aalto, P., Hämeri, K., Arnold, F., ...
The hygroscopic growth of aerosol particles present in a boreal forest was measured at a relative humidity of 88%. Simultaneously the gas phase concentration of sulfuric acid, a very hygroscopic...
Hirsikko, A., Bergman, T., Laakso, L., Dal Maso, M., Riipinen, I., Hõrrak, U., ...
We have measured the size distributions of air ions (0.42?7.5 nm in diameter) with the Balanced Scanning Mobility Analyzer in boreal forest, in Southern Finland since spring 2003. The size range...
SALSA ? a Sectional Aerosol module for Large Scale Applications (2007)
Kokkola, H., Korhonen, H., Lehtinen, K. E. J., Makkonen, R., Asmi, A., Järvenoja, S., ...
The sectional aerosol module SALSA is introduced. The model has been designed to be implemented in large scale climate models, which require both accuracy and computational efficiency. We have used...
New particle formation in the front range of the Colorado Rocky Mountains (2007)
Boy, M., Karl, T., Turnipseed, A., Mauldin, R. L., Kosciuch, E., Greenberg, J., ...
New particle formation is of interest because of its influence on the properties of aerosol population, and due to the possible contribution of newly formed particles to cloud condensation nuclei....
Black carbon concentration trends in Helsinki during 1996?2005 (2007)
Järvi, L., Junninen, H., Karppinen, A., Hillamo, R., Virkkula, A., Mäkelä, T., ...
The black carbon (BC) concentration trends were studied during ten years in Helsinki, Finland. Measurements were made in three campaigns between 1996 and 2005 at an urban area locating two kilometres...
Suni, T., Kulmala, M., Hirsikko, A., Bergman, T., Laakso, L., Aalto, P. P., ...
Biogenic aerosol formation is likely to contribute significantly to the global aerosol load. In recent years, new-particle formation (NPF) has been observed in various ecosystems around the world but...
Characterization of positive air ions in boreal forest air at the Hyytiälä SMEAR station (2007)
Hõrrak, U., Aalto, P. P., Salm, J., Komsaare, K., Tammet, H., Mäkelä, J. M., ...
The behavior of the concentration of positive small (or cluster) air ions and naturally charged nanometer aerosol particles (aerosol ions) has been studied on the basis of measurements carried out in...
The role of VOC oxidation products in continental new particle formation (2007)
Laaksonen, A., Kulmala, M., O'Dowd, C. D., Joutsensaari, J., Vaattovaara, P., Mikkonen, S., ...
Aerosol physical and chemical properties and trace gas concentrations were measured during the QUEST field campaign in March?April, 2003, in Hyytiälä, Finland. Our aim was to understand the role of...
Contribution of mixing in the ABL to new particle formation based on some observations (2007)
Lauros, J., Nilsson, E. D., Dal Maso, M., Kulmala, M.
The connection between new particle formation and micro- and mesoscale meteorology was studied based on measurements at SMEAR II station in Southern Finland. We analyzed turbulent conditions...
Chemical composition of atmospheric aerosols between Moscow and Vladivostok (2007)
Kuokka, S., Teinilä, K., Saarnio, K., Aurela, M., Sillanpää, M., Hillamo, R., ...
The TROICA-9 expedition (Trans-Siberian Observations Into the Chemistry of the Atmosphere) was carried out at the Trans-Siberian railway between Moscow and Vladivostok in October 2005. Measurements...
Hussein, T., Kukkonen, J., Korhonen, H., Pohjola, M., Pirjola, L., Wraith, D., ...
This study presents an evaluation and modeling of the size fractionated aerosol number concentrations that were measured near a major road of Itäväylä in Helsinki, during 23 August ? 19 September...
Bonn, B., Korhonen, H., Petäjä, T., Boy, M., Kulmala, M.
This study focusses on the description of the nucleation process observed during the ozone reaction of the biogenic monoterpene ?-pinene in smog chambers. Therefore, a detailed aerosol dynamics model...
Kurtén, T., Torpo, L., Sundberg, M. R., Vehkamäki, H., Kulmala, M.
We study the ammonia addition reactions of H2SO4·NH3 molecular clusters containing up to four ammonia and two sulfuric acid molecules using the ab initio method RI-MP2 (Resolution of Identity 2nd...
Hydrocarbon fluxes above a Scots pine forest canopy: Measurements and modeling (2007)
Rinne, J., Taipale, R., Markkanen, T., Ruuskanen, T. M., Hellén, H., Kajos, M. K., ...
We measured the fluxes of several hydrocarbon species above a Scots pine (Pinus sylvestris) stand using disjunct eddy covariance technique with proton transfer reaction ? mass spectrometry. The...
Damski, J., Thölix, L., Backman, L., Kaurola, J., Taalas, P., Austin, J., ...
A Global 40-year simulation from 1980 to 2019 was performed with the FinROSE chemistry-transport model based on the use of coupled chemistry GCM-data. The main focus of our analysis is on...
Ruuskanen, T. M., Kaasik, M., Aalto, P. P., Hõrrak, U., Vana, M., Mårtensson, M., ...
The LAPBIAT measurement campaign took place in the SMEAR I measurement station located in Eastern Lapland in the spring of 2003 between 26 April and 11 May. In this paper we describe the measurement...
Kuokka, S., Teinilä, K., Saarnio, K., Aurela, M., Sillanpää, M., Hillamo, R., ...
The TROICA-9 expedition (Trans-Siberian Observations Into the Chemistry of the Atmosphere) was carried out at the Trans-Siberian railway between Moscow and Vladivostok in October 2005. Measurements...
Contribution of mixing in the ABL to new particle formation based on observations (2007)
Lauros, J., Nilsson, E. D., Dal Maso, M., Kulmala, M.
The connection between new particle formation and micro- and mesoscale meteorology was studied based on measurements at SMEAR II station in Southern Finland. We analyzed turbulent conditions...
Hussein, T., Kukkonen, J., Korhonen, H., Pohjola, M., Pirjola, L., Wraith, D., ...
This study presents an evaluation and modeling exercise of the size fractionated aerosol particle number concentrations measured nearby a major road in Helsinki during 23 August?19 September 2003 and...
Ruuskanen, T. M., Kaasik, M., Aalto, P. P., Hõrrak, U., Vana, M., Mårtensson, M., ...
The LAPBIAT measurement campaign took place in the Värriö SMEAR I measurement station located in Eastern Lapland in the spring of 2003 between 26 April and 11 May. In this paper we describe the...
Hydrocarbon fluxes above a Scots pine forest canopy: measurements and modeling (2007)
Rinne, J., Taipale, R., Markkanen, T., Ruuskanen, T. M., Hellén, H., Kajos, M. K., ...
We measured the fluxes of several hydrocarbon species above a Scots pine (Pinus sylvestris) stand using disjunct eddy covariance technique with proton transfer reaction ? mass spectrometry. The...
Ambient sesquiterpene concentration and its link to air ion measurements (2007)
Bonn, B., Hirsikko, A., Hakola, H., Kurtén, T., Laakso, L., Boy, M., ...
Ambient air ion size distributions have been measured continuously at the Finnish boreal forest site in Hyytiälä since spring 2003. In general, these measurements show a maximum of air ions below...
Kurtén, T., Torpo, L., Sundberg, M. R., Vehkamäki, H., Kulmala, M.
We study the ammonia addition reactions of H2SO4·NH3 molecular clusters containing up to four ammonia and two sulfuric acid molecules using the ab initio method RI-MP2 (Resolution of Identity 2nd...
Waterfalls as sources of small charged aerosol particles (2007)
Laakso, L., Hirsikko, A., Grönholm, T., Kulmala, M., Luts, A.
In this study, we measured the mobility distributions of cluster and intermediate ions with an ion spectrometer near a waterfall. We observed that the concentration of negative 1.5?10 nm ions was...
Damski, J., Thölix, L., Backman, L., Kaurola, J., Taalas, P., Austin, J., ...
A global 40-year simulation from 1980 to 2019 was performed with the FinROSE chemistry-transport model based on the use of coupled chemistry GCM-data. The main focus of our analysis is on...
Riipinen, I., Kulmala, M., Arnold, F., Dal Maso, M., Birmili, W., ...
This study investigates the connections between atmospheric sulphuric acid and new particle formation during QUEST III and BACCI/QUEST IV campaigns. The campaigns have been conducted in Heidelberg...
Haapanala, S., Rinne, J., Hakola, H., Hellén, H., Laakso, L., Lihavainen, H., ...
Boundary layer concentrations of several volatile organic compounds (VOC) were measured during two campaigns in springs of 2003 and 2006. The measurements were conducted over boreal landscapes near...
Airborne measurements of nucleation mode particles I: coastal nucleation and growth rates (2007)
O'Dowd, C. D., Yoon, Y. J., Junkerman, W., Aalto, P., Kulmala, M., Lihavainen, H., ...
A light aircraft was equipped with a bank of Condensation Particle Counters (CPCs) (50% cut from 3?5.4?9.6 nm) and a nano-Scanning Mobility Particle Sizer (nSMPS) and deployed along the west coast of...
Laakso, L., Gagné, S., Petäjä, T., Hirsikko, A., Aalto, P. P., Kulmala, M., ...
The importance of ion-induced nucleation in the lower atmosphere has been discussed for a long time. In this article we describe a new instrumental setup ? Ion-DMPS ? which can be used to detect...
Sogacheva, L., Hamed, A., Facchini, M. C., Kulmala, M., Laaksonen, A.
In this paper, we study the transport of air masses to San Pietro Capofiume (SPC) in Po Valley, Italy, by means of back trajectories analysis. Our main aim is to investigate whether air masses...
Non-volatile residuals of newly formed atmospheric particles in the boreal forest (2007)
Ehn, M., Petäjä, T., Birmili, W., Junninen, H., Aalto, P., Kulmala, M.
The volatility of sub-micrometer atmospheric aerosol particles was studied in a rural background environment in Finland using a combination of a heating tube and a scanning mobility particle sizer....
Nucleation and growth of new particles in Po Valley, Italy (2007)
Hamed, A., Joutsensaari, J., Mikkonen, S., Sogacheva, L., Dal Maso, M., Kulmala, M., ...
Aerosol number distribution measurements are reported at San Pietro Capofiume (SPC) station (44°39' N, 11°37' E) for the time period 2002?2005. The station is located in Po Valley, the largest...
Technical Note: The heterogeneous Zeldovich factor (2007)
Vehkamäki, H., Määttänen, A., Lauri, A., Napari, I., Kulmala, M.
In this technical note we present the exact form of the Zeldovich factor for heterogeneous nucleation on spherical pre-existing particles. We study the error caused by planar pre-existing surface...
Ehn, M., Petäjä, T., Aufmhoff, H., Aalto, P., Hämeri, K., Arnold, F., ...
The hygroscopic growth of aerosol particles present in a boreal forest was measured at a relative humidity of 88%. Simultaneously the gas phase concentration of sulfuric acid, a very hygroscopic...
Hirsikko, A., Bergman, T., Laakso, L., Dal Maso, M., Riipinen, I., Hõrrak, U., ...
We have measured the size distributions of air ions (0.42?7.5 nm in diameter) with the Balanced Scanning Mobility Analyzer in boreal forest, in Southern Finland since spring 2003. The size range...
Hussein, T., Kukkonen, J., Korhonen, H., Pohjola, M., Pirjola, L., Wraith, Darren, ...
This study presents an evaluation and modeling exercise of the size fractionated aerosol particle number concentrations measured nearby a major road in Helsinki during 23 August–19 September 2003...
Petäjä, T., Dal Maso, M., Junninen, H., Koponen, I. K., Hussein, T., ...
The properties of atmospheric aerosol particles in Marseille and Athens were investigated. The studies were performed in Marseille, France, during July 2002 and in Athens, Greece, during June 2003....
Petäjä, T., Dal Maso, M., Junninen, H., Koponen, I. K., Hussein, T., ...
The properties of atmospheric aerosol particles in Marseille and Athens were investigated. The studies were performed in Marseille, France, during July 2002 and in Athens, Greece, during June 2003....
Hussein, T., Kukkonen, J., Korhonen, H., Pohjola, M., Pirjola, L., Wraith, Darren, ...
This study presents an evaluation and modeling exercise of the size fractionated aerosol particle number concentrations measured nearby a major road in Helsinki during 23 August–19 September 2003...
Hussein, T., Kukkonen, J., Korhonen, H., Pohjola, M., Pirjola, L., Wraith, Darren, ...
This study presents an evaluation and modeling exercise of the size fractionated aerosol particle number concentrations measured nearby a major road in Helsinki during 23 August–19 September 2003...
Hussein, T., Kukkonen, J., Korhonen, H., Pohjola, M., Pirjola, L., Wraith, Darren, ...
This study presents an evaluation and modeling exercise of the size fractionated aerosol particle number concentrations measured nearby a major road in Helsinki during 23 August–19 September 2003...
Hussein, T., Kukkonen, J., Korhonen, H., Pohjola, M., Pirjola, L., Wraith, Darren, ...
This study presents an evaluation and modeling exercise of the size fractionated aerosol particle number concentrations measured nearby a major road in Helsinki during 23 August-19 September 2003 and...
Ambient sesquiterpene concentration and its link to air ion measurements (2007)
B. Bonn, A. Hirsikko, H. Hakola, T. Kurtén, L. Laakso, M. Boy, ...
Ambient air ion size distributions have been measured continuously at the Finnish boreal forest site in Hyytiälä since spring 2003. In general, these measurements show a maximum of air ions below...
Hydrocarbon fluxes above a Scots pine forest canopy: measurements and modeling (2007)
J. Rinne, R. Taipale, T. Markkanen, T. M. Ruuskanen, H. Hellén, M. K. Kajos, ...
We measured the fluxes of several hydrocarbon species above a Scots pine (<I>Pinus sylvestris</I>) stand using disjunct eddy covariance technique with proton transfer reaction –...
T. M. Ruuskanen, M. Kaasik, P. P. Aalto, U. Hõrrak, M. Vana, M. Mårtensson, ...
The LAPBIAT measurement campaign took place in the Värriö SMEAR I measurement station located in Eastern Lapland in the spring of 2003 between 26 April and 11 May. In this paper we describe the...
T. Hussein, J. Kukkonen, H. Korhonen, M. Pohjola, L. Pirjola, D. Wraith, ...
This study presents an evaluation and modeling exercise of the size fractionated aerosol particle number concentrations measured nearby a major road in Helsinki during 23 August–19 September...
Contribution of mixing in the ABL to new particle formation based on observations (2007)
J. Lauros, E. D. Nilsson, M. Dal Maso, M. Kulmala
The connection between new particle formation and micro- and mesoscale meteorology was studied based on measurements at SMEAR II station in Southern Finland. We analyzed turbulent conditions...
S. Kuokka, K. Teinilä, K. Saarnio, M. Aurela, M. Sillanpää, R. Hillamo, ...
The TROICA-9 expedition (Trans-Siberian Observations Into the Chemistry of the Atmosphere) was carried out at the Trans-Siberian railway between Moscow and Vladivostok in October 2005. Measurements...
T. M. Ruuskanen, M. Kaasik, P. P. Aalto, U. Hõrrak, M. Vana, M. Mårtensson, ...
The LAPBIAT measurement campaign took place in the SMEAR I measurement station located in Eastern Lapland in the spring of 2003 between 26 April and 11 May. In this paper we describe the measurement...
J. Damski, L. Thölix, L. Backman, J. Kaurola, P. Taalas, J. Austin, ...
A Global 40-year simulation from 1980 to 2019 was performed with the FinROSE chemistry-transport model based on the use of coupled chemistry GCM-data. The main focus of our analysis is on...
Hydrocarbon fluxes above a Scots pine forest canopy: Measurements and modeling (2007)
J. Rinne, R. Taipale, T. Markkanen, T. M. Ruuskanen, H. Hellén, M. K. Kajos, ...
We measured the fluxes of several hydrocarbon species above a Scots pine (<it>Pinus sylvestris</it>) stand using disjunct eddy covariance technique with proton transfer reaction –...
T. Kurtén, L. Torpo, M. R. Sundberg, H. Vehkamäki, M. Kulmala
We study the ammonia addition reactions of H2SO4·NH3 molecular clusters containing up to four ammonia and two sulfuric acid molecules using the ab initio method RI-MP2 (Resolution of Identity...
B. Bonn, H. Korhonen, T. Petäjä, M. Boy, M. Kulmala
This study focusses on the description of the nucleation process observed during the ozone reaction of the biogenic monoterpene α-pinene in smog chambers. Therefore, a detailed aerosol dynamics...
T. Hussein, J. Kukkonen, H. Korhonen, M. Pohjola, L. Pirjola, D. Wraith, ...
This study presents an evaluation and modeling of the size fractionated aerosol number concentrations that were measured near a major road of Itäväylä in Helsinki, during 23 August – 19...
Chemical composition of atmospheric aerosols between Moscow and Vladivostok (2007)
S. Kuokka, K. Teinilä, K. Saarnio, M. Aurela, M. Sillanpää, R. Hillamo, ...
The TROICA-9 expedition (Trans-Siberian Observations Into the Chemistry of the Atmosphere) was carried out at the Trans-Siberian railway between Moscow and Vladivostok in October 2005. Measurements...
Contribution of mixing in the ABL to new particle formation based on some observations (2007)
J. Lauros, E. D. Nilsson, M. Dal Maso, M. Kulmala
The connection between new particle formation and micro- and mesoscale meteorology was studied based on measurements at SMEAR II station in Southern Finland. We analyzed turbulent conditions...
The role of VOC oxidation products in continental new particle formation (2007)
A. Laaksonen, M. Kulmala, C. D. O'Dowd, J. Joutsensaari, P. Vaattovaara, S. Mikkonen, ...
Aerosol physical and chemical properties and trace gas concentrations were measured during the QUEST field campaign in March–April, 2003, in Hyytiälä, Finland. Our aim was to understand the...
Characterization of positive air ions in boreal forest air at the Hyytiälä SMEAR station (2007)
U. Hõrrak, P. P. Aalto, J. Salm, K. Komsaare, H. Tammet, J. M. Mäkelä, ...
The behavior of the concentration of positive small (or cluster) air ions and naturally charged nanometer aerosol particles (aerosol ions) has been studied on the basis of measurements carried out in...
T. Suni, M. Kulmala, A. Hirsikko, T. Bergman, L. Laakso, P. P. Aalto, ...
Biogenic aerosol formation is likely to contribute significantly to the global aerosol load. In recent years, new-particle formation (NPF) has been observed in various ecosystems around the world but...
Black carbon concentration trends in Helsinki during 1996–2005 (2007)
L. Järvi, H. Junninen, A. Karppinen, R. Hillamo, A. Virkkula, T. Mäkelä, ...
The black carbon (BC) concentration trends were studied during ten years in Helsinki, Finland. Measurements were made in three campaigns between 1996 and 2005 at an urban area locating two kilometres...
New particle formation in the front range of the Colorado Rocky Mountains (2007)
M. Boy, T. Karl, A. Turnipseed, R. L. Mauldin, E. Kosciuch, J. Greenberg, ...
New particle formation is of interest because of its influence on the properties of aerosol population, and due to the possible contribution of newly formed particles to cloud condensation nuclei....
SALSA – a Sectional Aerosol module for Large Scale Applications (2007)
H. Kokkola, H. Korhonen, R. Makkonen, A. Asmi, S. Järvenoja, ...
The sectional aerosol module SALSA is introduced. The model has been designed to be implemented in large scale climate models, which require both accuracy and computational efficiency. We have used...
Suni, Tanja, Ristovski, Zoran, Morawska, Lidia, Guenther, Alex, Turnipseed, Andrew, Sogacheva, Larisa, ...
We measured the characteristics and dynamics of atmospheric ions, aerosol particles, and their precursors in an intensive field campaign in a Eucalypt forest in Tumbarumba, South-East Australia, in...
Hussein, T., Kukkonen, J., Korhonen, H., Pohjola, M., Pirjola, L., Wraith, Darren, ...
This study presents an evaluation and modeling exercise of the size fractionated aerosol particle number concentrations measured nearby a major road in Helsinki during 23 August–19 September 2003...
Airborne measurements of nucleation mode particles I: coastal nucleation and growth rates. (2007)
O'Dowd, C.D., Yoon, Y.J., Junkermann, W., Aalto, P., Kulmala, M., Lihavainen, H., ...
Atmospheric Chemistry and Physics, 7(2007) S.1491-1501
Airborne measurements of nucleation mode particles I: coastal nucleation and growth rates. (2007)
O'Dowd, C.D., Yoon, Y.J., Junkermann, W., Aalto, P., Kulmala, M., Lihavainen, H., ...
Atmospheric Chemistry and Physics, 7(2007) S.1491-1501
Suni, Tanja, Ristovski, Zoran, Morawska, Lidia, Guenther, Alex, Turnipseed, Andrew, Sogacheva, Larisa, ...
We measured the characteristics and dynamics of atmospheric ions, aerosol particles, and their precursors in an intensive field campaign in a Eucalypt forest in Tumbarumba, South-East Australia, in...
Hussein, T., Kukkonen, J., Korhonen, H., Pohjola, M., Pirjola, L., Wraith, Darren, ...
This study presents an evaluation and modeling exercise of the size fractionated aerosol particle number concentrations measured nearby a major road in Helsinki during 23 August–19 September 2003...
Sihto, L.H., Kulmala, M., Kerminen, V.M., Dal Maso, M., Petäjä, T., Riipinen, I., ...
We have investigated the formation and early growth of atmospheric secondary aerosol particles building on atmospheric measurements. The measurements were part of the QUEST 2 campaign which took...
Virkkula, A., Teinilä, K., Hillamo, R., Saarikoski, S., Aurela, M., ...
Aerosol chemical composition was measured over the Atlantic Ocean in November?December 1999 and at the Finnish Antarctic research station Aboa in January 2000. The concentrations of all anthropogenic...
Ambient sesquiterpene concentration and its link to air ion measurements (2006)
Bonn, B., Hirsikko, A., Hakola, H., Kurtén, T., Laakso, L., Boy, M., ...
Ambient air ion size distributions have been measured continuously at the Finnish boreal forest site in Hyytiälä since spring 2003. In general, these measurements show a maximum of air ions below...
Sogacheva, L., Hamed, A., Facchini, M. C., Kulmala, M., Laaksonen, A.
In this paper, we study the transport of air mass to San Pietro Capofiume (SPC) in Po Valley, Italy, by means of back trajectory analysis. Our main aim is to investigate whether air masses originate...
Riipinen, I., Kulmala, M., Arnold, F., Dal Maso, M., Birmili, W., ...
This study investigates the connections between atmospheric sulphuric acid and new particle formation during QUEST III and BACCI/QUEST IV campaigns. The campaigns have been conducted in Heidelberg...
Haapanala, S., Rinne, J., Hakola, H., Hellén, H., Laakso, L., Lihavainen, H., ...
Boundary layer concenrations of several volatile organic compounds (VOC) were measured during two campaigns in springs of 2003 and 2006. Measurements were conducted over boreal forests near SMEAR II...
New atmospheric particles with diameters of 3?10 nm and their subsequent growth to cloud condensation nucleus have been observed at various places in the European boundary layer. These events have...
Non-volatile residuals of newly formed atmospheric particles in the boreal forest (2006)
Ehn, M., Petäjä, T., Birmili, W., Junninen, H., Aalto, P., Kulmala, M.
The volatility of sub-micrometer atmospheric aerosol particles was studied in a rural background environment in Finland using a combination of a heating tube and a scanning mobility particle sizer....
Ehn, M., Petäjä, T., Aufmhoff, H., Aalto, P., Hämeri, K., Arnold, F., ...
Freshly formed atmospheric aerosol particles are neither large enough to efficiently scatter incoming solar radiation nor able to act as cloud condensation nuclei. As the particles grow larger, their...
Nucleation and growth of new particles in Po Valley, Italy (2006)
Hamed, A., Joutsensaari, J., Mikkonen, S., Sogacheva, L., Dal Maso, M., Kulmala, M., ...
Aerosol number distribution measurements are reported at San Pietro Capofiume (SPC) station (44°39' N, 11°37' E) for the time period 2002?2005. The station is located in Po Valley, the largest...
Waterfalls as sources of small charged aerosol particles (2006)
Laakso, L., Hirsikko, A., Grönholm, T., Kulmala, M., Luts, A.
In this study, we measured (to our knowledge, for the first time) the mobility distributions of cluster and intermediate ions with an ion spectrometer near a waterfall. We observed that the...
Hirsikko, A., Bergman, T., Laakso, L., Dal Maso, M., Riipinen, I., Hõrrak, U., ...
We have measured the size distributions of air ions (0.42?7.5 nm in diameter) with the Balanced Scanning Mobility Analyzer in boreal forest, in Southern Finland since spring 2003. The size range...
Technical note: The heterogeneous Zeldovich factor (2006)
Lauri, A., Napari, I., Kulmala, M.
In this technical note we present the exact form of the Zeldovich factor for heterogeneous nucleation on spherical pre-existing particles. We study the error caused by planar pre-existing surface...
Airborne measurements of nucleation mode particles I: coastal nucleation and growth rates (2006)
O'Dowd, C. D., Yoon, Y. J., Junkerman, W., Aalto, P., Kulmala, M., Lihavainen, H., ...
A light aircraft was equipped with a bank of Condensation Particle Counters (CPCs) (50% cut from 3?5.4?9.6 nm) and a nano-Scanning Mobility Particle Sizer (nSMPS) and deployed along the west coast of...
Spracklen, D. V., Carslaw, K. S., Kulmala, M., Mann, G. W.
The contribution of boundary layer nucleation events to total particle concentrations on the global scale has been studied by including a new particle formation mechanism in a global aerosol...
Niemi, J. V., Saarikoski, S., Tervahattu, H., Mäkelä, T., Hillamo, R., Vehkamäki, H., ...
Aerosol samples were collected at a rural background site in southern Finland in May 2004. The elemental composition, morphology and mixing state of individual aerosol particles in three size...
Laakso, L., Gagné, S., Petäjä, T., Hirsikko, A., Aalto, P. P., Kulmala, M., ...
The importance of ion-induced nucleation in the lower atmosphere has been discussed for a long time. In this article we describe a new instrumental setup ? Ion-DMPS ? which can be used to detect...
Räisänen, P., Bogdan, A., Sassen, K., Kulmala, M., Molina, M. J.
Recent laboratory experiments showed that at conditions resembling those near the tropopause region, small quasi-spherical ice particles can be coated by a liquid H2SO4/H2O over-layer formed after...
Kulmala, M., Dal Maso, M., Petäjä, T., Riipinen, I., ...
We have investigated the formation and early growth of atmospheric secondary aerosol particles building on atmospheric measurements. The measurements were part of the QUEST 2 campaign which took...
MALTE ? Model to predict new aerosol formation in the lower troposphere (2006)
Boy, M., Hellmuth, O., Korhonen, H., Nilsson, E. D., Revelle, D., Turnipseed, A., ...
The manuscript presents a detailed description of the meteorological and chemical code of Malte ? a model to predict new aerosol formation in the lower troposphere. The aerosol dynamics are achieved...
Tammet, H., Hõrrak, U., Laakso, L., Kulmala, M.
A new theoretical model includes dry deposition of ions onto the forest canopy and takes into account different parameters of positive and negative ions. Explicit algebraic solution of the air ion...
Foliage surface ozone deposition: a role for surface moisture? (2006)
Altimir, N., Kolari, P., Vesala, T., Bäck, J., Suni, T., ...
This paper addresses the potential role of surface wetness in ozone deposition to plant foliage. We studied Scots pine foliage in field conditions at the SMEARII field measurement station in Finland....
Foliage surface ozone deposition: a role for surface moisture? (2006)
Altimir, N., Kolari, P., Vesala, T., Bäck, J., Suni, T., ...
This paper addresses the potential role of surface wetness in ozone deposition to plant foliage. We studied Scots pine foliage in field conditions at the SMEARII field measurement station in Finland....
Seasonal variation of mono- and sesquiterpene emission rates of Scots pine (2006)
Hakola, H., Tarvainen, V., Bäck, J., Ranta, H., Bonn, B., Rinne, J., ...
The seasonal variation of mono-and sesquiterpene emission rates of Scots pine was measured from April to October in 2004. The emission rates were measured daily in the afternoons with the exception...
Spracklen, D. V., Carslaw, K. S., Kulmala, M., Mann, G. W.
The contribution of boundary layer (BL) nucleation events to total particle concentrations on the global scale has been studied by including a new particle formation mechanism in a global aerosol...
Niemi, J. V., Saarikoski, S., Tervahattu, H., Mäkelä, T., Hillamo, R., Vehkamäki, H., ...
Aerosol samples were collected at a rural background site in southern Finland in May 2004 during pollution episode (PM1~16 µg m?3, backward air mass trajectories from south-east), intermediate...
Räisänen, P., Bogdan, A., Sassen, K., Kulmala, M., Molina, M. J.
Recent laboratory experiments showed that at conditions resembling those near the tropopause region, small ice particles can be coated by a liquid H2SO4/H2O over-layer formed after the freezing of...
MALTE ? model to predict new aerosol formation in the lower troposphere (2006)
Boy, M., Hellmuth, O., Korhonen, H., Nilsson, E. D., Revelle, D., Turnipseed, A., ...
The manuscript presents a detailed description of the meteorological and chemical code of Malte ? a model to predict new aerosol formation in the lower troposphere. The aerosol dynamics are achieved...
Kulmala, M., Dal Maso, M., Petäjä, T., Riipinen, I., ...
We have investigated the formation and early growth of atmospheric secondary aerosol particles building on atmospheric measurements. The measurements were part of the QUEST 2 campaign which took...
Virkkula, A., Teinilä, K., Hillamo, R., Saarikoski, S., Aurela, M., ...
Aerosol chemical composition was measured over the Atlantic Ocean in November?December 1999 and at the Finnish Antarctic research station Aboa in January 2000. The concentrations of all anthropogenic...
Tammet, H., Hõrrak, U., Laakso, L., Kulmala, M.
A new mathematical model describing air ion balance was developed and tested. It has improved approximations and includes dry deposition of ions onto the forest canopy. The model leads to an explicit...
Komppula, M., Korhonen, H., Lihavainen, H., Kulmala, M., ...
This study covers four years of aerosol number size distribution data from Pallas and Värriö sites 250 km apart from each other in Northern Finland and compares new particle formation events...
Fuzzi, S., Andreae, M. O., Huebert, B. J., Kulmala, M., Bond, T. C., Boy, M., ...
In spite of impressive advances in recent years, our present understanding of organic aerosol (OA) composition, physical and chemical properties, sources and transformation characteristics is still...
Measurements of optical properties of atmospheric aerosols in Northern Finland (2006)
Aaltonen, V., Lihavainen, H., Komppula, M., Hatakka, J., Eneroth, K., ...
Three years of continuous measurements of aerosol optical properties and simultaneous aerosol number size distribution measurements at Pallas GAW station, a remote subarctic site in the northern...
Kulmala, M., Lehtinen, K. E. J., Laaksonen, A.
According to atmospheric observations new particle formation seems to be a function of sulphuric acid concentration to the power from one to two. The nucleation theorem then predicts that the...
Allan, J. D., Alfarra, M. R., Bower, K. N., Coe, H., Jayne, J. T., Worsnop, D. R., ...
The study of the growth of nucleation-mode particles is important, as this prevents their loss through diffusion and allows them to reach sizes where they may become effective cloud condensation...
Virkkula, A., Teinilä, K., Hillamo, R., Saarikoski, S., Aurela, M., ...
Aerosol chemical composition was measured over the Atlantic Ocean in November?December 1999 and at the Finnish Antarctic research station Aboa in January 2000. The concentrations of all anthropogenic...
Ambient sesquiterpene concentration and its link to air ion measurements (2006)
Bonn, B., Hirsikko, A., Hakola, H., Kurtén, T., Laakso, L., Boy, M., ...
Ambient air ion size distributions have been measured continuously at the Finnish boreal forest site in Hyytiälä since spring 2003. In general, these measurements show a maximum of air ions below...
Sogacheva, L., Hamed, A., Facchini, M. C., Kulmala, M., Laaksonen, A.
In this paper, we study the transport of air mass to San Pietro Capofiume (SPC) in Po Valley, Italy, by means of back trajectory analysis. Our main aim is to investigate whether air masses originate...
Riipinen, I., Kulmala, M., Arnold, F., Dal Maso, M., Birmili, W., ...
This study investigates the connections between atmospheric sulphuric acid and new particle formation during QUEST III and BACCI/QUEST IV campaigns. The campaigns have been conducted in Heidelberg...
Haapanala, S., Rinne, J., Hakola, H., Hellén, H., Laakso, L., Lihavainen, H., ...
Boundary layer concenrations of several volatile organic compounds (VOC) were measured during two campaigns in springs of 2003 and 2006. Measurements were conducted over boreal forests near SMEAR II...
New atmospheric particles with diameters of 3?10 nm and their subsequent growth to cloud condensation nucleus have been observed at various places in the European boundary layer. These events have...
Non-volatile residuals of newly formed atmospheric particles in the boreal forest (2006)
Ehn, M., Petäjä, T., Birmili, W., Junninen, H., Aalto, P., Kulmala, M.
The volatility of sub-micrometer atmospheric aerosol particles was studied in a rural background environment in Finland using a combination of a heating tube and a scanning mobility particle sizer....
Ehn, M., Petäjä, T., Aufmhoff, H., Aalto, P., Hämeri, K., Arnold, F., ...
Freshly formed atmospheric aerosol particles are neither large enough to efficiently scatter incoming solar radiation nor able to act as cloud condensation nuclei. As the particles grow larger, their...
Nucleation and growth of new particles in Po Valley, Italy (2006)
Hamed, A., Joutsensaari, J., Mikkonen, S., Sogacheva, L., Dal Maso, M., Kulmala, M., ...
Aerosol number distribution measurements are reported at San Pietro Capofiume (SPC) station (44°39' N, 11°37' E) for the time period 2002?2005. The station is located in Po Valley, the largest...
Waterfalls as sources of small charged aerosol particles (2006)
Laakso, L., Hirsikko, A., Grönholm, T., Kulmala, M., Luts, A.
In this study, we measured (to our knowledge, for the first time) the mobility distributions of cluster and intermediate ions with an ion spectrometer near a waterfall. We observed that the...
Hirsikko, A., Bergman, T., Laakso, L., Dal Maso, M., Riipinen, I., Hõrrak, U., ...
We have measured the size distributions of air ions (0.42?7.5 nm in diameter) with the Balanced Scanning Mobility Analyzer in boreal forest, in Southern Finland since spring 2003. The size range...
Technical note: The heterogeneous Zeldovich factor (2006)
Lauri, A., Napari, I., Kulmala, M.
In this technical note we present the exact form of the Zeldovich factor for heterogeneous nucleation on spherical pre-existing particles. We study the error caused by planar pre-existing surface...
Airborne measurements of nucleation mode particles I: coastal nucleation and growth rates (2006)
O'Dowd, C. D., Yoon, Y. J., Junkerman, W., Aalto, P., Kulmala, M., Lihavainen, H., ...
A light aircraft was equipped with a bank of Condensation Particle Counters (CPCs) (50% cut from 3?5.4?9.6 nm) and a nano-Scanning Mobility Particle Sizer (nSMPS) and deployed along the west coast of...
Spracklen, D. V., Carslaw, K. S., Kulmala, M., Mann, G. W.
The contribution of boundary layer nucleation events to total particle concentrations on the global scale has been studied by including a new particle formation mechanism in a global aerosol...
Niemi, J. V., Saarikoski, S., Tervahattu, H., Mäkelä, T., Hillamo, R., Vehkamäki, H., ...
Aerosol samples were collected at a rural background site in southern Finland in May 2004. The elemental composition, morphology and mixing state of individual aerosol particles in three size...
Laakso, L., Gagné, S., Petäjä, T., Hirsikko, A., Aalto, P. P., Kulmala, M., ...
The importance of ion-induced nucleation in the lower atmosphere has been discussed for a long time. In this article we describe a new instrumental setup ? Ion-DMPS ? which can be used to detect...
Räisänen, P., Bogdan, A., Sassen, K., Kulmala, M., Molina, M. J.
Recent laboratory experiments showed that at conditions resembling those near the tropopause region, small quasi-spherical ice particles can be coated by a liquid H2SO4/H2O over-layer formed after...
Kulmala, M., Dal Maso, M., Petäjä, T., Riipinen, I., ...
We have investigated the formation and early growth of atmospheric secondary aerosol particles building on atmospheric measurements. The measurements were part of the QUEST 2 campaign which took...
MALTE ? Model to predict new aerosol formation in the lower troposphere (2006)
Boy, M., Hellmuth, O., Korhonen, H., Nilsson, E. D., Revelle, D., Turnipseed, A., ...
The manuscript presents a detailed description of the meteorological and chemical code of Malte ? a model to predict new aerosol formation in the lower troposphere. The aerosol dynamics are achieved...
Tammet, H., Hõrrak, U., Laakso, L., Kulmala, M.
A new theoretical model includes dry deposition of ions onto the forest canopy and takes into account different parameters of positive and negative ions. Explicit algebraic solution of the air ion...
Foliage surface ozone deposition: a role for surface moisture? (2006)
Altimir, N., Kolari, P., Vesala, T., Bäck, J., Suni, T., ...
This paper addresses the potential role of surface wetness in ozone deposition to plant foliage. We studied Scots pine foliage in field conditions at the SMEARII field measurement station in Finland....
Foliage surface ozone deposition: a role for surface moisture? (2006)
Altimir, N., Kolari, P., Vesala, T., Bäck, J., Suni, T., ...
This paper addresses the potential role of surface wetness in ozone deposition to plant foliage. We studied Scots pine foliage in field conditions at the SMEARII field measurement station in Finland....
Seasonal variation of mono- and sesquiterpene emission rates of Scots pine (2006)
Hakola, H., Tarvainen, V., Bäck, J., Ranta, H., Bonn, B., Rinne, J., ...
The seasonal variation of mono-and sesquiterpene emission rates of Scots pine was measured from April to October in 2004. The emission rates were measured daily in the afternoons with the exception...
Spracklen, D. V., Carslaw, K. S., Kulmala, M., Mann, G. W.
The contribution of boundary layer (BL) nucleation events to total particle concentrations on the global scale has been studied by including a new particle formation mechanism in a global aerosol...
Niemi, J. V., Saarikoski, S., Tervahattu, H., Mäkelä, T., Hillamo, R., Vehkamäki, H., ...
Aerosol samples were collected at a rural background site in southern Finland in May 2004 during pollution episode (PM1~16 µg m?3, backward air mass trajectories from south-east), intermediate...
Räisänen, P., Bogdan, A., Sassen, K., Kulmala, M., Molina, M. J.
Recent laboratory experiments showed that at conditions resembling those near the tropopause region, small ice particles can be coated by a liquid H2SO4/H2O over-layer formed after the freezing of...
MALTE ? model to predict new aerosol formation in the lower troposphere (2006)
Boy, M., Hellmuth, O., Korhonen, H., Nilsson, E. D., Revelle, D., Turnipseed, A., ...
The manuscript presents a detailed description of the meteorological and chemical code of Malte ? a model to predict new aerosol formation in the lower troposphere. The aerosol dynamics are achieved...
Kulmala, M., Dal Maso, M., Petäjä, T., Riipinen, I., ...
We have investigated the formation and early growth of atmospheric secondary aerosol particles building on atmospheric measurements. The measurements were part of the QUEST 2 campaign which took...
Virkkula, A., Teinilä, K., Hillamo, R., Saarikoski, S., Aurela, M., ...
Aerosol chemical composition was measured over the Atlantic Ocean in November?December 1999 and at the Finnish Antarctic research station Aboa in January 2000. The concentrations of all anthropogenic...
Tammet, H., Hõrrak, U., Laakso, L., Kulmala, M.
A new mathematical model describing air ion balance was developed and tested. It has improved approximations and includes dry deposition of ions onto the forest canopy. The model leads to an explicit...
Komppula, M., Korhonen, H., Lihavainen, H., Kulmala, M., ...
This study covers four years of aerosol number size distribution data from Pallas and Värriö sites 250 km apart from each other in Northern Finland and compares new particle formation events...
Fuzzi, S., Andreae, M. O., Huebert, B. J., Kulmala, M., Bond, T. C., Boy, M., ...
In spite of impressive advances in recent years, our present understanding of organic aerosol (OA) composition, physical and chemical properties, sources and transformation characteristics is still...
Measurements of optical properties of atmospheric aerosols in Northern Finland (2006)
Aaltonen, V., Lihavainen, H., Komppula, M., Hatakka, J., Eneroth, K., ...
Three years of continuous measurements of aerosol optical properties and simultaneous aerosol number size distribution measurements at Pallas GAW station, a remote subarctic site in the northern...
Kulmala, M., Lehtinen, K. E. J., Laaksonen, A.
According to atmospheric observations new particle formation seems to be a function of sulphuric acid concentration to the power from one to two. The nucleation theorem then predicts that the...
Allan, J. D., Alfarra, M. R., Bower, K. N., Coe, H., Jayne, J. T., Worsnop, D. R., ...
The study of the growth of nucleation-mode particles is important, as this prevents their loss through diffusion and allows them to reach sizes where they may become effective cloud condensation...
Petäjä, T., Dal Maso, M., Junninen, H., Koponen, I. K., Hussein, T., ...
The properties of atmospheric aerosol particles in Marseille and Athens were investigated. The studies were performed in Marseille, France during July 2002 and in Athens Greece during June 2003. The...
Petäjä, T., Dal Maso, M., Junninen, H., Koponen, I. K., Hussein, T., ...
The properties of atmospheric aerosol particles in Marseille and Athens were investigated. The studies were performed in Marseille, France during July 2002 and in Athens Greece during June 2003. The...
Foliage surface ozone deposition: a role for surface moisture? (2006)
N. Altimir, P. Kolari, T. Vesala, J. Bäck, T. Suni, ...
This paper addresses the potential role of surface wetness in ozone deposition to plant foliage. We studied Scots pine foliage in field conditions at the SMEARII field measurement station in Finland....
A. Virkkula, K. Teinilä, R. Hillamo, S. Saarikoski, M. Aurela, ...
Aerosol chemical composition was measured over the Atlantic Ocean in November–December 1999 and at the Finnish Antarctic research station Aboa in January 2000. The concentrations of all...
MALTE – Model to predict new aerosol formation in the lower troposphere (2006)
M. Boy, O. Hellmuth, H. Korhonen, E. D. Nilsson, D. ReVelle, A. Turnipseed, ...
The manuscript presents a detailed description of the meteorological and chemical code of Malte – a model to predict new aerosol formation in the lower troposphere. The aerosol dynamics are...
M. Kulmala, M. Dal Maso, T. Petäjä, I. Riipinen, ...
We have investigated the formation and early growth of atmospheric secondary aerosol particles building on atmospheric measurements. The measurements were part of the QUEST 2 campaign which took...
P. Räisänen, A. Bogdan, K. Sassen, M. Kulmala, M. J. Molina
Recent laboratory experiments showed that at conditions resembling those near the tropopause region, small quasi-spherical ice particles can be coated by a liquid...
L. Sogacheva, A. Hamed, M. C. Facchini, M. Kulmala, A. Laaksonen
In this paper, we study the transport of air mass to San Pietro Capofiume (SPC) in Po Valley, Italy, by means of back trajectory analysis. Our main aim is to investigate whether air masses originate...
Ambient sesquiterpene concentration and its link to air ion measurements (2006)
B. Bonn, A. Hirsikko, H. Hakola, T. Kurtén, L. Laakso, M. Boy, ...
Ambient air ion size distributions have been measured continuously at the Finnish boreal forest site in Hyytiälä since spring 2003. In general, these measurements show a maximum of air ions below...
MALTE – Model to predict new aerosol formation in the lower troposphere (2006)
M. Boy, O. Hellmuth, H. Korhonen, E. D. Nilsson, D. ReVelle, A. Turnipseed, ...
The manuscript presents a detailed description of the meteorological and chemical code of Malte – a model to predict new aerosol formation in the lower troposphere. The aerosol dynamics are...
P. Räisänen, A. Bogdan, K. Sassen, M. Kulmala, M. J. Molina
Recent laboratory experiments showed that at conditions resembling those near the tropopause region, small quasi-spherical ice particles can be coated by a liquid H2SO4/H2O over-layer formed after...
Fiedler, V., Dal Maso, M., Boy, M., Aufmhoff, H., Hoffmann, J., Schuck, T., ...
Atmospheric gaseous sulphuric acid was measured and its influence on particle formation and growth was investigated building on aerosol data. The measurements were part of the EU-project QUEST and...
Komppula, M., Korhonen, H., Lihavainen, H., Kulmala, M., ...
This study covers four years of aerosol number size distribution data from Pallas and Värriö sites 250 km apart from each other in Northern Finland and compares new particle formation events...
Fuzzi, S., Andreae, M. O., Huebert, B. J., Kulmala, M., Bond, T. C., Boy, M., ...
In spite of impressive advances in recent years, our present understanding of organic aerosol (OA) composition, physical and chemical properties, sources and transformation characteristics is still...
Measurements of optical properties of atmospheric aerosols in Northern Finland (2005)
Aaltonen, V., Lihavainen, H., Komppula, M., Hatakka, J., Eneroth, K., ...
Three years of continuous measurements of aerosol optical properties and simultaneous aerosol number size distribution measurements at Pallas GAW station, a remote subarctic site in the northern...
Why formation rate of 3 nm particles depends linearly on sulphuric acid concentration? (2005)
Kulmala, M., Lehtinen, K. E. J., Laaksonen, A.
According to atmospheric observations new particle formation seems to be a function of sulphuric acid concentration to the power from one to two. The nucleation theorem then predicts that the...
Allan, J. D., Alfarra, M. R., Bower, K. N., Coe, H., Jayne, J. T., Worsnop, D. R., ...
The study of the growth of nucleation-mode particles is important, as this prevents their loss through diffusion and allows them to reach sizes where they may become effective cloud condensation...
A look at aerosol formation using data mining techniques (2005)
Hyvönen, S., Junninen, H., Laakso, L., Dal Maso, M., Grönholm, T., Bonn, B., ...
Atmospheric aerosol particle formation is frequently observed throughout the atmosphere, but despite various attempts of explanation, the processes behind it remain unclear. In this study data mining...
Korhonen, H., Lehtinen, K. E. J., Kulmala, M.
We investigate the influence of low size resolution, typical to sectional aerosol models in large scale applications, on cloud droplet activation and cloud processing of aerosol particles. A...
Kourtchev, I., Ruuskanen, T., Maenhaut, W., Kulmala, M., Claeys, M.
Oxidation products of isoprene including 2-methyltetrols (2-methylthreitol and 2-methylerythritol), 2-methylglyceric acid and triol derivatives of isoprene (2-methyl-1,3,4-trihydroxy-1-butene (cis...
Characterization of air ions in boreal forest air during BIOFOR III campaign (2005)
Hõrrak, U., Aalto, P. P., Salm, J., Mäkelä, J. M., Laakso, L., Laakso, L., ...
The behavior of the concentration of positive small (or cluster) air ions and naturally charged nanometer aerosol particles (aerosol ions) has been studied on the basis of measurements carried out in...
Niemi, J. V., Tervahattu, H., Vehkamäki, H., Martikainen, J., Laakso, L., Kulmala, M., ...
We studied the sources, compositions and size distributions of aerosol particles during long-range transport (LRT) PM2.5 episodes occurred on 12?15 August, 26?28 August and 5?6 September 2002 in...
Fiedler, V., Dal Maso, M., Boy, M., Aufmhoff, H., Hoffmann, J., Schuck, T., ...
Atmospheric gaseous sulphuric acid was measured and its influence on particle formation and growth was investigated building on aerosol data. The measurements were part of the EU-project QUEST and...
Seasonal variation of mono- and sesquiterpene emission rates of Scots pine (2005)
Hakola, H., Tarvainen, V., Bäck, J., Ranta, H., Bonn, B., Rinne, J., ...
The seasonal variation of mono-and sesquiterpene emission rates of Scots pine was measured from April to October in 2004. The emission rates were measured daily in the afternoons with the exception...
A look at aerosol formation using data mining techniques (2005)
Hyvönen, S., Junninen, H., Laakso, L., Dal Maso, M., Grönholm, T., Bonn, B., ...
Atmospheric aerosol particle formation is frequently observed throughout the atmosphere, but despite various attempts of explanation, the processes behind it remain unclear. In this study data mining...
Kourtchev, I., Ruuskanen, T., Maenhaut, W., Kulmala, M., Claeys, M.
Oxidation products of isoprene including 2-methyltetrols (2-methylthreitol and 2-methylerythritol), 2-methylglyceric acid and triol derivatives of isoprene (2-methyl-1,3,4-trihydroxy-1-butene (cis...
CCN activation and cloud processing in sectional aerosol models with low size resolution (2005)
Korhonen, H., Lehtinen, K. E. J., Kulmala, M.
We investigate the influence of low size resolution, typical to sectional aerosol models in large scale applications, on cloud droplet activation and cloud processing of aerosol particles. A...
Niemi, J. V., Tervahattu, H., Vehkamäki, H., Martikainen, J., Laakso, L., Kulmala, M., ...
We studied the sources, compositions and size distributions of aerosol particles during long-range transport (LRT) PM2.5 episodes which occurred on 12?15 August, 26?28 August and 5?6 September 2002...
Fiedler, V., Dal Maso, M., Boy, M., Aufmhoff, H., Hoffmann, J., Schuck, T., ...
Atmospheric gaseous sulphuric acid was measured and its influence on particle formation and growth was investigated building on aerosol data. The measurements were part of the EU-project QUEST and...
Temperature and light dependence of the VOC emissions of Scots pine (2005)
Tarvainen, V., Hakola, H., Hellén, H., Bäck, J., Hari, P., Kulmala, M.
The volatile organic compound (VOC) emission rates of Scots pine (Pinus sylvestris L.) were measured from trees growing in a natural forest environment at two locations in Finland. The observed total...
Sulphuric acid closure and contribution to nucleation mode particle growth (2005)
Boy, M., Kulmala, M., Ruuskanen, T. M., Pihlatie, M., Reissell, A., Aalto, P. P., ...
Sulphuric acid concentrations were measured and calculated based on pseudo steady state model with corresponding measurements of CO, NOx, O3, SO2, methane and non-methane hydrocarbon (NMHC)...
Effects of SO2 oxidation on ambient aerosol growth in water and ethanol vapours (2005)
Petäjä, T., Hämeri, K., Vaattovaara, P., Joutsensaari, J., Junkermann, W., ...
Hygroscopicity (i.e. water vapour affinity) of atmospheric aerosol particles is one of the key factors in defining their impacts on climate. Condensation of sulphuric acid onto less hygroscopic...
Commentary on cloud modelling and the mass accommodation coefficient of water (2005)
Laaksonen, A., Vesala, T., Kulmala, M., Winkler, P. M., Wagner, P. E.
The mass accommodation coefficient of water is a quantity for which different experimental techniques have yielded conflicting values in the range 0.04-1. From the viewpoint of cloud modelling, this...
Kulmala, M., Petäjä, T., Mönkkönen, P., Koponen, I. K., Dal Maso, M., Aalto, P. P., ...
The growth properties of nucleation mode particles were investigated. The variation of source rates of condensable vapors in different locations and environmental conditions was analyzed. The...
Sellegri, K., Hanke, M., Umann, B., Arnold, F., Kulmala, M.
Biogenic VOCs are important in the growth and possibly also in the early stages of formation of atmospheric aerosol particles. In this work, we present 10 min-time resolution measurements of organic...
Mönkkönen, P., Koponen, I. K., Lehtinen, K. E. J., Hämeri, K., Uma, R., Kulmala, M.
Diurnal variation of number size distribution (particle size 3-800nm) and modal parameters (geometric standard deviation, geometric mean diameter and modal aerosol particle concentration) in a highly...
Komppula, M., Korhonen, H., Lihavainen, H., Kulmala, M., ...
This study covers four years of aerosol number size distribution data from Pallas and Värriö sites 250 km apart from each other in Northern Finland and compares new particle formation events...
Fuzzi, S., Andreae, M. O., Huebert, B. J., Kulmala, M., Bond, T. C., Boy, M., ...
In spite of impressive advances in recent years, our present understanding of organic aerosol (OA) composition, physical and chemical properties, sources and transformation characteristics is still...
Measurements of optical properties of atmospheric aerosols in Northern Finland (2005)
Aaltonen, V., Lihavainen, H., Komppula, M., Hatakka, J., Eneroth, K., ...
Three years of continuous measurements of aerosol optical properties and simultaneous aerosol number size distribution measurements at Pallas GAW station, a remote subarctic site in the northern...
Why formation rate of 3 nm particles depends linearly on sulphuric acid concentration? (2005)
Kulmala, M., Lehtinen, K. E. J., Laaksonen, A.
According to atmospheric observations new particle formation seems to be a function of sulphuric acid concentration to the power from one to two. The nucleation theorem then predicts that the...
Allan, J. D., Alfarra, M. R., Bower, K. N., Coe, H., Jayne, J. T., Worsnop, D. R., ...
The study of the growth of nucleation-mode particles is important, as this prevents their loss through diffusion and allows them to reach sizes where they may become effective cloud condensation...
A look at aerosol formation using data mining techniques (2005)
Hyvönen, S., Junninen, H., Laakso, L., Dal Maso, M., Grönholm, T., Bonn, B., ...
Atmospheric aerosol particle formation is frequently observed throughout the atmosphere, but despite various attempts of explanation, the processes behind it remain unclear. In this study data mining...
Korhonen, H., Lehtinen, K. E. J., Kulmala, M.
We investigate the influence of low size resolution, typical to sectional aerosol models in large scale applications, on cloud droplet activation and cloud processing of aerosol particles. A...
Kourtchev, I., Ruuskanen, T., Maenhaut, W., Kulmala, M., Claeys, M.
Oxidation products of isoprene including 2-methyltetrols (2-methylthreitol and 2-methylerythritol), 2-methylglyceric acid and triol derivatives of isoprene (2-methyl-1,3,4-trihydroxy-1-butene (cis...
Characterization of air ions in boreal forest air during BIOFOR III campaign (2005)
Hõrrak, U., Aalto, P. P., Salm, J., Mäkelä, J. M., Laakso, L., Laakso, L., ...
The behavior of the concentration of positive small (or cluster) air ions and naturally charged nanometer aerosol particles (aerosol ions) has been studied on the basis of measurements carried out in...
Niemi, J. V., Tervahattu, H., Vehkamäki, H., Martikainen, J., Laakso, L., Kulmala, M., ...
We studied the sources, compositions and size distributions of aerosol particles during long-range transport (LRT) PM2.5 episodes occurred on 12?15 August, 26?28 August and 5?6 September 2002 in...
Fiedler, V., Dal Maso, M., Boy, M., Aufmhoff, H., Hoffmann, J., Schuck, T., ...
Atmospheric gaseous sulphuric acid was measured and its influence on particle formation and growth was investigated building on aerosol data. The measurements were part of the EU-project QUEST and...
Seasonal variation of mono- and sesquiterpene emission rates of Scots pine (2005)
Hakola, H., Tarvainen, V., Bäck, J., Ranta, H., Bonn, B., Rinne, J., ...
The seasonal variation of mono-and sesquiterpene emission rates of Scots pine was measured from April to October in 2004. The emission rates were measured daily in the afternoons with the exception...
A look at aerosol formation using data mining techniques (2005)
Hyvönen, S., Junninen, H., Laakso, L., Dal Maso, M., Grönholm, T., Bonn, B., ...
Atmospheric aerosol particle formation is frequently observed throughout the atmosphere, but despite various attempts of explanation, the processes behind it remain unclear. In this study data mining...
Kourtchev, I., Ruuskanen, T., Maenhaut, W., Kulmala, M., Claeys, M.
Oxidation products of isoprene including 2-methyltetrols (2-methylthreitol and 2-methylerythritol), 2-methylglyceric acid and triol derivatives of isoprene (2-methyl-1,3,4-trihydroxy-1-butene (cis...
CCN activation and cloud processing in sectional aerosol models with low size resolution (2005)
Korhonen, H., Lehtinen, K. E. J., Kulmala, M.
We investigate the influence of low size resolution, typical to sectional aerosol models in large scale applications, on cloud droplet activation and cloud processing of aerosol particles. A...
Niemi, J. V., Tervahattu, H., Vehkamäki, H., Martikainen, J., Laakso, L., Kulmala, M., ...
We studied the sources, compositions and size distributions of aerosol particles during long-range transport (LRT) PM2.5 episodes which occurred on 12?15 August, 26?28 August and 5?6 September 2002...
Fiedler, V., Dal Maso, M., Boy, M., Aufmhoff, H., Hoffmann, J., Schuck, T., ...
Atmospheric gaseous sulphuric acid was measured and its influence on particle formation and growth was investigated building on aerosol data. The measurements were part of the EU-project QUEST and...
Temperature and light dependence of the VOC emissions of Scots pine (2005)
Tarvainen, V., Hakola, H., Hellén, H., Bäck, J., Hari, P., Kulmala, M.
The volatile organic compound (VOC) emission rates of Scots pine (Pinus sylvestris L.) were measured from trees growing in a natural forest environment at two locations in Finland. The observed total...
Sulphuric acid closure and contribution to nucleation mode particle growth (2005)
Boy, M., Kulmala, M., Ruuskanen, T. M., Pihlatie, M., Reissell, A., Aalto, P. P., ...
Sulphuric acid concentrations were measured and calculated based on pseudo steady state model with corresponding measurements of CO, NOx, O3, SO2, methane and non-methane hydrocarbon (NMHC)...
Effects of SO2 oxidation on ambient aerosol growth in water and ethanol vapours (2005)
Petäjä, T., Hämeri, K., Vaattovaara, P., Joutsensaari, J., Junkermann, W., ...
Hygroscopicity (i.e. water vapour affinity) of atmospheric aerosol particles is one of the key factors in defining their impacts on climate. Condensation of sulphuric acid onto less hygroscopic...
Commentary on cloud modelling and the mass accommodation coefficient of water (2005)
Laaksonen, A., Vesala, T., Kulmala, M., Winkler, P. M., Wagner, P. E.
The mass accommodation coefficient of water is a quantity for which different experimental techniques have yielded conflicting values in the range 0.04-1. From the viewpoint of cloud modelling, this...
Kulmala, M., Petäjä, T., Mönkkönen, P., Koponen, I. K., Dal Maso, M., Aalto, P. P., ...
The growth properties of nucleation mode particles were investigated. The variation of source rates of condensable vapors in different locations and environmental conditions was analyzed. The...
Sellegri, K., Hanke, M., Umann, B., Arnold, F., Kulmala, M.
Biogenic VOCs are important in the growth and possibly also in the early stages of formation of atmospheric aerosol particles. In this work, we present 10 min-time resolution measurements of organic...
Mönkkönen, P., Koponen, I. K., Lehtinen, K. E. J., Hämeri, K., Uma, R., Kulmala, M.
Diurnal variation of number size distribution (particle size 3-800nm) and modal parameters (geometric standard deviation, geometric mean diameter and modal aerosol particle concentration) in a highly...
Atmospheric Chemistry and Physics Discussions (2005)
S. Hyvönen, H. Junninen, L. Laakso, M. Dal Maso, T. Grönholm, B. Bonn, ...
www.atmos-chem-phys.org/acpd/5/7577/
Seasonal variation of mono- and sesquiterpene emission rates of Scots pine (2005)
H. Hakola, V. Tarvainen, J. Bäck, H. Ranta, B. Bonn, J. Rinne, ...
The seasonal variation of mono-and sesquiterpene emission rates of Scots pine was measured from April to October in 2004. The emission rates were measured daily in the afternoons with the exception...
V. Fiedler, M. Dal Maso, M. Boy, H. Aufmhoff, J. Hoffmann, T. Schuck, ...
Atmospheric gaseous sulphuric acid was measured and its influence on particle formation and growth was investigated building on aerosol data. The measurements were part of the EU-project QUEST and...
J. V. Niemi, H. Tervahattu, H. Vehkamäki, J. Martikainen, L. Laakso, M. Kulmala, ...
We studied the sources, compositions and size distributions of aerosol particles during long-range transport (LRT) PM<sub>2.5</sub> episodes occurred on 12–15 August, 26–28...
Characterization of air ions in boreal forest air during BIOFOR III campaign (2005)
U. Hõrrak, P. P. Aalto, J. Salm, J. M. Mäkelä, L. Laakso, L. Laakso, ...
The behavior of the concentration of positive small (or cluster) air ions and naturally charged nanometer aerosol particles (aerosol ions) has been studied on the basis of measurements carried out in...
I. Kourtchev, T. Ruuskanen, W. Maenhaut, M. Kulmala, M. Claeys
Oxidation products of isoprene including 2-methyltetrols (2-methylthreitol and 2-methylerythritol), 2-methylglyceric acid and triol derivatives of isoprene (2-methyl-1,3,4-trihydroxy-1-butene (cis...
Why formation rate of 3 nm particles depends linearly on sulphuric acid concentration? (2005)
According to atmospheric observations new particle formation seems to be a function of sulphuric acid concentration to the power from one to two. The nucleation theorem then predicts that the...
Measurements of optical properties of atmospheric aerosols in Northern Finland (2005)
V. Aaltonen, H. Lihavainen, M. Komppula, J. Hatakka, K. Eneroth, ...
Three years of continuous measurements of aerosol optical properties and simultaneous aerosol number size distribution measurements at Pallas GAW station, a remote subarctic site in the northern...
S. Fuzzi, M. O. Andreae, B. J. Huebert, M. Kulmala, T. C. Bond, M. Boy, ...
In spite of impressive advances in recent years, our present understanding of organic aerosol (OA) composition, physical and chemical properties, sources and transformation characteristics is still...
M. Komppula, H. Korhonen, H. Lihavainen, M. Kulmala, ...
This study covers four years of aerosol number size distribution data from Pallas and Värriö sites 250 km apart from each other in Northern Finland and compares new particle formation...
Niemi, J. V., Tervahattu, H., Vehkamäki, H., Martikainen, J., Laakso, L., Kulmala, M., ...
We studied the sources, compositions and size distributions of aerosol particles during long-range transport (LRT) PM2.5 episodes which occurred on 12–15 August, 26– 28 August and 5–6 September...
Fatty acids on continental sulfate aerosol particles (2005)
Tervahattu, H., Juhanoja, J., Vaida, V., Tuck, A. F., Niemi, J. V., Kupiainen, K., ...
Published 2005 American Geophysical Union. Reproduced by permission of American Geophysical Union.
Niemi, J. V., Tervahattu, H., Virkkula, A., Hillamo, D., Teinilä, K., Koponen, I. K., ...
Aerosol samples were collected in the Atlantic marine boundary layer between the English Channel and Antarctica during November–December 1999. The composition of coarse (aerodynamic diameter 1–3...
Effects of SO2 oxidation on ambient aerosol growth in water and ethanol vapours. (2005)
Petäjä, T., Kerminen, V.M., Hämeri, K., Vaattovaara, P., Junkermann, W., Laaksonen, A., ...
Atmospheric Chemistry and Physics, 5(2005) S.767-779
Boy, M., Petäjä, T., Dal Maso, M., Rannik, Ü., Rinne, J., Aalto, P., ...
Kinetic nucleation and ions in boreal particle formation events (2004)
Laakso, L., Anttila, T., Lehtinen, K., Aalto, P., Kulmala, M., Horrak, U., ...
Tunved, P., Korhonen, H., Ström, J., Lehtinen, K. E. J., Kulmala, M.
The evolution of the aerosol size distribution during transport between Aspvreten (58.8° N, 17.4° E) and Värriö (67.46° N, 29.35° E) was studied using a pseudo-Lagrangian approach. Aerosol...
Effects of SO2 oxidation on ambient aerosol growth in water and ethanol vapours (2004)
Petäjä, T., Hämeri, K., Vaattovaara, P., Joutsensaari, J., Junkermann, W., ...
Hygroscopicity (i.e. water vapour affinity) of atmospheric aerosol particles is one of the key factors in defining their impacts on climate. Condensation of sulphuric acid onto less hygroscopic...
On cloud modelling and the mass accommodation coefficient of water (2004)
Laaksonen, A., Vesala, T., Kulmala, M., Winkler, P. M., Wagner, P. E.
The mass accommodation coefficient of water is a quantity for which different experimental techniques have yielded conflicting values in the range 0.04?1. From the viewpoint of cloud modelling, this...
Kulmala, M., Petäjä, T., Mönkkönen, P., Koponen, I. K., Dal Maso, M., Aalto, P. P., ...
The growth properties of nucleation mode particles were investigated. The variation of source rates of condensable vapors in different locations and environmental conditions was analyzed. The...
Temperature and light dependence of the VOC emissions of Scots pine (2004)
Tarvainen, V., Hakola, H., Hellén, H., Bäck, J., Hari, P., Kulmala, M.
The volatile organic compound (VOC) emission rates of Scots pine (Pinus sylvestris L.) were measured from trees growing in a natural forest environment at two locations in Finland. The emission rate...
Sulphuric acid closure and contribution to nucleation mode particle growth (2004)
Boy, M., Kulmala, M., Ruuskanen, T. M., Pihlatie, M., Reissell, A., Aalto, P. P., ...
Sulphuric acid concentrations were measured and calculated based on pseudo steady state model with corresponding measurements of CO, NOx, O3, SO2, methane and non-methane hydrocarbon (NMHC)...
Mönkkönen, P., Koponen, I. K., Lehtinen, K. E. J., Hämeri, K., Uma, R., Kulmala, M.
Diurnal variation of number size distribution (particle size 3?800 nm) and modal parameters (geometric standard deviation, geometric mean diameter and modal aerosol particle concentration) in a...
Sellegri, K., Hanke, M., Umann, B., Arnold, F., Kulmala, M.
Biogenic VOCs are important in the growth and possibly also in the formation of atmospheric aerosol particles. In this work, we present 10 min-time resolution measurements of organic trace gases at...
Ion production rate in a boreal forest based on ion, particle and radiation measurements (2004)
Laakso, L., Petäjä, T., Lehtinen, K. E. J., Kulmala, M., Paatero, J., Hõrrak, U., ...
In this study the ion production rates in a boreal forest are studied based on two different methods: 1) cluster ion and particle concentration measurements, 2) external radiation and radon...
Kinetic nucleation and ions in boreal particle formation events (2004)
Laakso, L., Anttila, T., Lehtinen, K. E. J., Aalto, P. P., Kulmala, M., Hõrrak, U., ...
In order to gain a more comprehensive picture on different mechanisms behind atmospheric particle formation, measurement results from QUEST 2-campaign are analyzed with an aid of an aerosol dynamic...
Vehkamäki, H., Dal Maso, M., Hussein, T., Flanagan, R., Hyvärinen, A., Lauros, J., ...
We have identified 147 clear 8 nm diameter particle formation events at the SMEAR I station in Värriö, northern Finland during calendar years 1998?2002. The events have been classified in detail...
Multicomponent aerosol dynamics model UHMA: model development and validation (2004)
Korhonen, H., Lehtinen, K. E. J., Kulmala, M.
A size-segregated aerosol dynamics model UHMA (University of Helsinki Multicomponent Aerosol model) was developed for studies of multicomponent tropospheric aerosol particles. The model includes...
Initial steps of aerosol growth (2004)
Kulmala, M., Laakso, L., Lehtinen, K. E. J., Riipinen, I., Dal Maso, M., Anttila, T., ...
The formation and growth of atmospheric aerosols depend on several steps, namely nucleation, initial steps of growth and subsequent ? mainly condensational ? growth. This work focuses on the initial...
Kinetic nucleation and ions in boreal forest particle formation events (2004)
Laakso, L., Anttila, T., Lehtinen, K. E. J., Aalto, P. P., Kulmala, M., Hõrrak, U., ...
In order to gain a more comprehensive picture on different mechanisms behind atmospheric particle formation, measurement results from QUEST 2-campaign are analyzed with an aid of an aerosol dynamic...
Vehkamäki, H., Dal Maso, M., Hussein, T., Flanagan, R., Hyvärinen, A., Lauros, J., ...
During the calendar years 1998-2002, 147 clear 8nm diameter particle formation events have been identified at the SMEAR I station in Värriö, northern Finland. The events have been classified in...
Ion production rate in a boreal forest based on ion, particle and radiation measurements (2004)
Laakso, L., Petäjä, T., Lehtinen, K. E. J., Kulmala, M., Paatero, J., Hõrrak, U., ...
In this study the ion production rates in a boreal forest were studied based on two different methods: 1) cluster ion and particle concentration measurements, 2) external radiation and radon...
Modelling the formation of organic particles in the atmosphere (2004)
Anttila, T., Kulmala, M., Laaksonen, A., O'Dowd, C. D.
Particle formation resulting from activation of inorganic stable clusters by a supersaturated organic vapour was investigated using a numerical model. The applied aerosol dynamic model included a...
Multicomponent aerosol dynamics model UHMA: model development and validation (2004)
Korhonen, H., Lehtinen, K. E. J., Kulmala, M.
A size-segregated aerosol dynamics model UHMA (University of Helsinki Multicomponent Aerosol model) was developed for studies of multicomponent tropospheric aerosol particles. The model includes...
Boy, M., Petäjä, T., Dal Maso, M., Rannik, Ü., Rinne, J., Aalto, P., ...
As part of the OSOA (Origin and formation of Secondary Organic Aerosols) project, two intensive field campaigns were conducted in Melpitz, Germany and Hyytiälä, Finland. This paper gives an...
A new feedback mechanism linking forests, aerosols, and climate (2004)
Kulmala, M., Suni, T., Lehtinen, K. E. J., Dal Maso, M., Boy, M., Reissell, A., ...
The possible connections between the carbon balance of ecosystems and aerosol-cloud-climate interactions play a significant role in climate change studies. Carbon dioxide is a greenhouse gas, whereas...
Urban aerosol number size distributions (2004)
Hussein, T., Puustinen, A., Aalto, P. P., Mäkelä, J. M., Hämeri, K., Kulmala, M.
Aerosol number size distributions have been measured since 5 May 1997 in Helsinki, Finland. The presented aerosol data represents size distributions within the particle diameter size range 8-400nm...
Tunved, P., Korhonen, H., Ström, J., Lehtinen, K. E. J., Kulmala, M.
The evolution of the aerosol size distribution during transport between Aspvreten (58.8° N, 17.4° E) and Värriö (67.46° N, 29.35° E) was studied using a pseudo-Lagrangian approach. Aerosol...
Effects of SO2 oxidation on ambient aerosol growth in water and ethanol vapours (2004)
Petäjä, T., Hämeri, K., Vaattovaara, P., Joutsensaari, J., Junkermann, W., ...
Hygroscopicity (i.e. water vapour affinity) of atmospheric aerosol particles is one of the key factors in defining their impacts on climate. Condensation of sulphuric acid onto less hygroscopic...
On cloud modelling and the mass accommodation coefficient of water (2004)
Laaksonen, A., Vesala, T., Kulmala, M., Winkler, P. M., Wagner, P. E.
The mass accommodation coefficient of water is a quantity for which different experimental techniques have yielded conflicting values in the range 0.04?1. From the viewpoint of cloud modelling, this...
Kulmala, M., Petäjä, T., Mönkkönen, P., Koponen, I. K., Dal Maso, M., Aalto, P. P., ...
The growth properties of nucleation mode particles were investigated. The variation of source rates of condensable vapors in different locations and environmental conditions was analyzed. The...
Temperature and light dependence of the VOC emissions of Scots pine (2004)
Tarvainen, V., Hakola, H., Hellén, H., Bäck, J., Hari, P., Kulmala, M.
The volatile organic compound (VOC) emission rates of Scots pine (Pinus sylvestris L.) were measured from trees growing in a natural forest environment at two locations in Finland. The emission rate...
Sulphuric acid closure and contribution to nucleation mode particle growth (2004)
Boy, M., Kulmala, M., Ruuskanen, T. M., Pihlatie, M., Reissell, A., Aalto, P. P., ...
Sulphuric acid concentrations were measured and calculated based on pseudo steady state model with corresponding measurements of CO, NOx, O3, SO2, methane and non-methane hydrocarbon (NMHC)...
Mönkkönen, P., Koponen, I. K., Lehtinen, K. E. J., Hämeri, K., Uma, R., Kulmala, M.
Diurnal variation of number size distribution (particle size 3?800 nm) and modal parameters (geometric standard deviation, geometric mean diameter and modal aerosol particle concentration) in a...
Sellegri, K., Hanke, M., Umann, B., Arnold, F., Kulmala, M.
Biogenic VOCs are important in the growth and possibly also in the formation of atmospheric aerosol particles. In this work, we present 10 min-time resolution measurements of organic trace gases at...
Ion production rate in a boreal forest based on ion, particle and radiation measurements (2004)
Laakso, L., Petäjä, T., Lehtinen, K. E. J., Kulmala, M., Paatero, J., Hõrrak, U., ...
In this study the ion production rates in a boreal forest are studied based on two different methods: 1) cluster ion and particle concentration measurements, 2) external radiation and radon...
Kinetic nucleation and ions in boreal particle formation events (2004)
Laakso, L., Anttila, T., Lehtinen, K. E. J., Aalto, P. P., Kulmala, M., Hõrrak, U., ...
In order to gain a more comprehensive picture on different mechanisms behind atmospheric particle formation, measurement results from QUEST 2-campaign are analyzed with an aid of an aerosol dynamic...
Vehkamäki, H., Dal Maso, M., Hussein, T., Flanagan, R., Hyvärinen, A., Lauros, J., ...
We have identified 147 clear 8 nm diameter particle formation events at the SMEAR I station in Värriö, northern Finland during calendar years 1998?2002. The events have been classified in detail...
Multicomponent aerosol dynamics model UHMA: model development and validation (2004)
Korhonen, H., Lehtinen, K. E. J., Kulmala, M.
A size-segregated aerosol dynamics model UHMA (University of Helsinki Multicomponent Aerosol model) was developed for studies of multicomponent tropospheric aerosol particles. The model includes...
Initial steps of aerosol growth (2004)
Kulmala, M., Laakso, L., Lehtinen, K. E. J., Riipinen, I., Dal Maso, M., Anttila, T., ...
The formation and growth of atmospheric aerosols depend on several steps, namely nucleation, initial steps of growth and subsequent ? mainly condensational ? growth. This work focuses on the initial...
Kinetic nucleation and ions in boreal forest particle formation events (2004)
Laakso, L., Anttila, T., Lehtinen, K. E. J., Aalto, P. P., Kulmala, M., Hõrrak, U., ...
In order to gain a more comprehensive picture on different mechanisms behind atmospheric particle formation, measurement results from QUEST 2-campaign are analyzed with an aid of an aerosol dynamic...
Vehkamäki, H., Dal Maso, M., Hussein, T., Flanagan, R., Hyvärinen, A., Lauros, J., ...
During the calendar years 1998-2002, 147 clear 8nm diameter particle formation events have been identified at the SMEAR I station in Värriö, northern Finland. The events have been classified in...
Ion production rate in a boreal forest based on ion, particle and radiation measurements (2004)
Laakso, L., Petäjä, T., Lehtinen, K. E. J., Kulmala, M., Paatero, J., Hõrrak, U., ...
In this study the ion production rates in a boreal forest were studied based on two different methods: 1) cluster ion and particle concentration measurements, 2) external radiation and radon...
Modelling the formation of organic particles in the atmosphere (2004)
Anttila, T., Kulmala, M., Laaksonen, A., O'Dowd, C. D.
Particle formation resulting from activation of inorganic stable clusters by a supersaturated organic vapour was investigated using a numerical model. The applied aerosol dynamic model included a...
Multicomponent aerosol dynamics model UHMA: model development and validation (2004)
Korhonen, H., Lehtinen, K. E. J., Kulmala, M.
A size-segregated aerosol dynamics model UHMA (University of Helsinki Multicomponent Aerosol model) was developed for studies of multicomponent tropospheric aerosol particles. The model includes...
Boy, M., Petäjä, T., Dal Maso, M., Rannik, Ü., Rinne, J., Aalto, P., ...
As part of the OSOA (Origin and formation of Secondary Organic Aerosols) project, two intensive field campaigns were conducted in Melpitz, Germany and Hyytiälä, Finland. This paper gives an...
A new feedback mechanism linking forests, aerosols, and climate (2004)
Kulmala, M., Suni, T., Lehtinen, K. E. J., Dal Maso, M., Boy, M., Reissell, A., ...
The possible connections between the carbon balance of ecosystems and aerosol-cloud-climate interactions play a significant role in climate change studies. Carbon dioxide is a greenhouse gas, whereas...
Urban aerosol number size distributions (2004)
Hussein, T., Puustinen, A., Aalto, P. P., Mäkelä, J. M., Hämeri, K., Kulmala, M.
Aerosol number size distributions have been measured since 5 May 1997 in Helsinki, Finland. The presented aerosol data represents size distributions within the particle diameter size range 8-400nm...
Multicomponent aerosol dynamics model UHMA: model development and validation (2004)
A size-segregated aerosol dynamics model UHMA (University of Helsinki Multicomponent Aerosol model) was developed for studies of multicomponent tropospheric aerosol particles. The model includes...
H. Vehkamäki, M. Dal Maso, T. Hussein, R. Flanagan, A. Hyvärinen, J. Lauros, ...
We have identified 147 clear 8 nm diameter particle formation events at the SMEAR I station in Värriö, northern Finland during calendar years 1998–2002. The events have been...
Kinetic nucleation and ions in boreal particle formation events (2004)
L. Laakso, T. Anttila, P. P. Aalto, M. Kulmala, U. Hõrrak, ...
In order to gain a more comprehensive picture on different mechanisms behind atmospheric particle formation, measurement results from QUEST 2-campaign are analyzed with an aid of an aerosol dynamic...
Ion production rate in a boreal forest based on ion, particle and radiation measurements (2004)
L. Laakso, T. Petäjä, M. Kulmala, J. Paatero, U. Hõrrak, ...
In this study the ion production rates in a boreal forest are studied based on two different methods: 1) cluster ion and particle concentration measurements, 2) external radiation and radon...
K. Sellegri, M. Hanke, B. Umann, F. Arnold, M. Kulmala
Biogenic VOCs are important in the growth and possibly also in the formation of atmospheric aerosol particles. In this work, we present 10 min-time resolution measurements of organic trace gases at...
P. Mönkkönen, I. K. Koponen, K. Hämeri, R. Uma, M. Kulmala
Diurnal variation of number size distribution (particle size 3–800 nm) and modal parameters (geometric standard deviation, geometric mean diameter and modal aerosol particle concentration) in a...
Sulphuric acid closure and contribution to nucleation mode particle growth (2004)
M. Boy, M. Kulmala, T. M. Ruuskanen, M. Pihlatie, A. Reissell, P. P. Aalto, ...
Sulphuric acid concentrations were measured and calculated based on pseudo steady state model with corresponding measurements of CO, NO<sub>x</sub>, O<sub>3</sub>,...
Temperature and light dependence of the VOC emissions of Scots pine (2004)
V. Tarvainen, H. Hakola, H. Hellén, J. Bäck, P. Hari, M. Kulmala
The volatile organic compound (VOC) emission rates of Scots pine (<I>Pinus sylvestris</I> L.) were measured from trees growing in a natural forest environment at two locations in...
M. Kulmala, T. Petäjä, P. Mönkkönen, I. K. Koponen, M. Dal Maso, P. P. Aalto, ...
The growth properties of nucleation mode particles were investigated. The variation of source rates of condensable vapors in different locations and environmental conditions was analyzed. The...
On cloud modelling and the mass accommodation coefficient of water (2004)
A. Laaksonen, T. Vesala, M. Kulmala, P. M. Winkler, P. E. Wagner
The mass accommodation coefficient of water is a quantity for which different experimental techniques have yielded conflicting values in the range 0.04–1. From the viewpoint of cloud modelling,...
Effects of SO2 oxidation on ambient aerosol growth in water and ethanol vapours (2004)
T. Petäjä, K. Hämeri, P. Vaattovaara, J. Joutsensaari, W. Junkermann, ...
Hygroscopicity (i.e. water vapour affinity) of atmospheric aerosol particles is one of the key factors in defining their impacts on climate. Condensation of sulphuric acid onto less hygroscopic...
P. Tunved, H. Korhonen, J. Ström, M. Kulmala
The evolution of the aerosol size distribution during transport between Aspvreten (58.8° N, 17.4° E) and Värriö (67.46° N, 29.35° E) was studied using a pseudo-Lagrangian...
Characterization and source identification of a fine particle episode in Finland (2004)
Niemi, J.V., Tervahattu, H., Vehkamäki, H., Kulmala, M., Koskentalo, T., Sillanpää, M., ...
http://www.elsevier.com/locate/issn/13522310
Characterization and source identification of a fine particle episode in Finland (2004)
Niemi, J. V., Tervahattu, H., Vehkamäki, H., Kulmala, M., Koskentalo, T., Sillanpää, M., ...
A strong long-range transported (LRT) fine particle (PM2.5) episode occurred from March 17–22, 2002 over large areas of Finland. Most of the LRT particle mass was in the submicrometre size...
Modelling the formation of organic particles in the atmosphere (2003)
Anttila, T., Kulmala, M., Laaksonen, A., O'Dowd, C.
A modelling study investigating the formation of organic particles from inorganic, thermodynamically stable clusters was carried out. A recently-developed theory, the so-called nano-Köhler theory,...
A new feedback mechanism linking forests, aerosols, and climate (2003)
Kulmala, M., Suni, T., Lehtinen, K. E. J., Dal Maso, M., Boy, M., Reissell, A., ...
Among significant issues in climate change studies are the possible connections between the carbon balance of ecosystems and aerosol-cloud-climate interactions. Carbon dioxide is a greenhouse gas,...
Urban aerosol number size distributions (2003)
Hussein, T., Puustinen, A., Aalto, P. P., Mäkelä, J. M., Hämeri, K., Kulmala, M.
Aerosol number size distributions were measured continuously in Helsinki, Finland from 5 May 1997 to 28 February 2003. The daily, monthly and annual patterns were investigated. The temporal variation...
Boy, M., Petäja, T., Dal Maso, M., Rannik, Ü., Rinne, J., Aalto, P., ...
As one part of the OSOA (Origin and formation of Secondary Organic Aerosols) project, two intensive field campaigns were conducted in Melpitz, Germany and Hyytiälä, Finland. This paper gives an...
One year boundary layer aerosol size distribution data from five Nordic background stations (2003)
Tunved, P., Kulmala, M., Aalto, P., Viisanen, Y., Karlsson, H., ...
Size distribution measurements performed at five different stations have been investigated during a one-year period between 01 June 2000 and 31 May 2001 with focus on diurnal, seasonal and...
One year boundary layer aerosol size distribution data from five nordic background stations (2003)
Tunved, P., Kulmala, M., Aalto, P., Viisanen, Y., Karlsson, H., ...
Size distribution measurements performed at five different stations have been investigated during a one-year period between 01 June 2000 and 31 May 2001 with focus on diurnal, seasonal and...
A model for particle formation and growth in the atmosphere with molecular resolution in size (2003)
Lehtinen, K. E. J., Kulmala, M.
The formation and growth of atmospheric aerosol particles is considered using an exact discrete method with molecular resolution in size space. The method is immune to numerical diffusion problems...
Modelling the formation of organic particles in the atmosphere (2003)
Anttila, T., Kulmala, M., Laaksonen, A., O'Dowd, C.
A modelling study investigating the formation of organic particles from inorganic, thermodynamically stable clusters was carried out. A recently-developed theory, the so-called nano-Köhler theory,...
A new feedback mechanism linking forests, aerosols, and climate (2003)
Kulmala, M., Suni, T., Lehtinen, K. E. J., Dal Maso, M., Boy, M., Reissell, A., ...
Among significant issues in climate change studies are the possible connections between the carbon balance of ecosystems and aerosol-cloud-climate interactions. Carbon dioxide is a greenhouse gas,...
Urban aerosol number size distributions (2003)
Hussein, T., Puustinen, A., Aalto, P. P., Mäkelä, J. M., Hämeri, K., Kulmala, M.
Aerosol number size distributions were measured continuously in Helsinki, Finland from 5 May 1997 to 28 February 2003. The daily, monthly and annual patterns were investigated. The temporal variation...
Boy, M., Petäja, T., Dal Maso, M., Rannik, Ü., Rinne, J., Aalto, P., ...
As one part of the OSOA (Origin and formation of Secondary Organic Aerosols) project, two intensive field campaigns were conducted in Melpitz, Germany and Hyytiälä, Finland. This paper gives an...
One year boundary layer aerosol size distribution data from five Nordic background stations (2003)
Tunved, P., Kulmala, M., Aalto, P., Viisanen, Y., Karlsson, H., ...
Size distribution measurements performed at five different stations have been investigated during a one-year period between 01 June 2000 and 31 May 2001 with focus on diurnal, seasonal and...
One year boundary layer aerosol size distribution data from five nordic background stations (2003)
Tunved, P., Kulmala, M., Aalto, P., Viisanen, Y., Karlsson, H., ...
Size distribution measurements performed at five different stations have been investigated during a one-year period between 01 June 2000 and 31 May 2001 with focus on diurnal, seasonal and...
A model for particle formation and growth in the atmosphere with molecular resolution in size (2003)
Lehtinen, K. E. J., Kulmala, M.
The formation and growth of atmospheric aerosol particles is considered using an exact discrete method with molecular resolution in size space. The method is immune to numerical diffusion problems...
Bogdan, A., Kulmala, M., MacKenzie, A. Robert, Laaksonen, A., Molina, M. J., Avramenko, A.
The study of nanometer-scale aqueous systems (finely divided aqueous systems (FDAS)) can be achieved using the absorption of vapors on fumed silica (SiO2) powder. Being a product of flame synthesis...
One year boundary layer aerosol size distribution data from five Nordic background stations (2003)
P. Tunved, M. Kulmala, P. Aalto, Y. Viisanen, H. Karlsson, ...
Size distribution measurements performed at five different stations have been investigated during a one-year period between 01 June 2000 and 31 May 2001 with focus on diurnal, seasonal and...
M. Boy, T. Petäja, M. Dal Maso, Ü. Rannik, J. Rinne, P. Aalto, ...
As one part of the OSOA (Origin and formation of Secondary Organic Aerosols) project, two intensive field campaigns were conducted in Melpitz, Germany and Hyytiälä, Finland. This paper gives an...
Urban aerosol number size distributions (2003)
T. Hussein, A. Puustinen, P. P. Aalto, J. M. Mäkelä, K. Hämeri, M. Kulmala
Aerosol number size distributions were measured continuously in Helsinki, Finland from 5 May 1997 to 28 February 2003. The daily, monthly and annual patterns were investigated. The temporal variation...
De Hartog, J. J., Hoek, G., Peters, A., Timonen, K. L., Ibald-Mulli, A., Brunekreef, B., ...
The ULTRA Study, a study investigating the association between fine and ultrafine particulate air pollution and cardiorespiratory health, was conducted during the winter of 1998–1999 in Amsterdam,...
Vehkamaki, H., Kulmala, M., Napari, I., Lehtinen, K. E. J., Timmreck, C., Noppel, M., ...
In this paper we present parameterized equations for calculation of sulfuric acid-water critical nucleus compositions, critical cluster radii and homogeneous nucleation rates for tropospheric and...
A model for particle formation and growth in the atmosphere with molecular resolution in size (2002)
Lehtinen, K. E. J., Kulmala, M.
The formation and growth of atmospheric aerosol particles is considered using an exact discrete method with molecular resolution in size space. The method is immune to numerical diffusion problems...
The relationship between nucleation events and spectral solar irradiance was analysed using two years of data collected at the Station for Measuring Forest Ecosystem-Atmosphere Relations (SMEAR II)...
The relationship between nucleation events and spectral solar irradiance was analysed using two years of data collected at the Station for Measuring Forest Ecosystem-Atmosphere Relations (SMEAR II)...
Field measurements of hygroscopic properties and state of mixing of nucleation mode particles (2002)
Väkevä, M., Kulmala, M., Stratmann, F., Hämeri, K.
An Ultrafine Tandem Differential Mobility Analyser (UF-TDMA) has been used in several field campaigns over the last few years. The investigations were focused on the origin and properties of...
The relationship between nucleation events and numerous physical and meteorological parameters was analysed using data collected at the Station for Measuring Forest Ecosystem-Atmosphere Relations...
A model for particle formation and growth in the atmosphere with molecular resolution in size (2002)
Lehtinen, K. E. J., Kulmala, M.
The formation and growth of atmospheric aerosol particles is considered using an exact discrete method with molecular resolution in size space. The method is immune to numerical diffusion problems...
The relationship between nucleation events and spectral solar irradiance was analysed using two years of data collected at the Station for Measuring Forest Ecosystem-Atmosphere Relations (SMEAR II)...
The relationship between nucleation events and spectral solar irradiance was analysed using two years of data collected at the Station for Measuring Forest Ecosystem-Atmosphere Relations (SMEAR II)...
Field measurements of hygroscopic properties and state of mixing of nucleation mode particles (2002)
Väkevä, M., Kulmala, M., Stratmann, F., Hämeri, K.
An Ultrafine Tandem Differential Mobility Analyser (UF-TDMA) has been used in several field campaigns over the last few years. The investigations were focused on the origin and properties of...
The relationship between nucleation events and numerous physical and meteorological parameters was analysed using data collected at the Station for Measuring Forest Ecosystem-Atmosphere Relations...
The relationship between nucleation events and spectral solar irradiance was analysed using two years of data collected at the Station for Measuring Forest Ecosystem-Atmosphere Relations (SMEAR II)...
A model for particle formation and growth in the atmosphere with molecular resolution in size (2002)
The formation and growth of atmospheric aerosol particles is considered using an exact discrete method with molecular resolution in size space. The method is immune to numerical diffusion problems...
Kulmala, M., Hameri, K., Aalto, P.P., Makela, J.M., Pirjola, L., Nilsson, E.D., ...
Aerosol formation and subsequent particle growth in ambient air have been frequently observed at a boreal forest site (SMEAR II station) in Southern Finland. The EU funded project BIOFOR (Biogenic...
Hygroscopic and ccn properties of aerosol-particles in boreal forests (2001)
Hameri, K., Vakeva, M., Aalto, P.P., Kulmala, M., Swietlicki, E., Zhou, J., ...
Field measurements of hygroscopic properties and state of mixing of nucleation mode particles (2001)
Väkevä, M., Kulmala, M., Stratmann, F., Hämeri, K.
An Ultrafine Tandem Differential Mobility Analyser (UF-TDMA) has been used in several field campaigns over the last few years. The investigations were focused on the origin and properties of...
The relationship between nucleation events and numerous physical and meteorological parameters was analysed using data collected at the Station for Measuring Forest Ecosystem-Atmosphere Relations...
Field measurements of hygroscopic properties and state of mixing of nucleation mode particles (2001)
Väkevä, M., Kulmala, M., Stratmann, F., Hämeri, K.
An Ultrafine Tandem Differential Mobility Analyser (UF-TDMA) has been used in several field campaigns over the last few years. The investigations were focused on the origin and properties of...
The relationship between nucleation events and numerous physical and meteorological parameters was analysed using data collected at the Station for Measuring Forest Ecosystem-Atmosphere Relations...
The relationship between nucleation events and numerous physical and meteorological parameters was analysed using data collected at the Station for Measuring Forest Ecosystem-Atmosphere Relations...
Field measurements of hygroscopic properties and state of mixing of nucleation mode particles (2001)
M. Väkevä, M. Kulmala, F. Stratmann, K. Hämeri
An Ultrafine Tandem Differential Mobility Analyser (UF-TDMA) has been used in several field campaigns over the last few years. The investigations were focused on the origin and properties of...
Soluble-Insoluble Transition in Binary Heterogeneous Nucleation (2001)
Kulmala, M., Ortner, R., Petersen, D., Vrtala, A., Wagner, P. E.
Ternary nucleation of H2SO4, NH3 and H2O (2000)
Kulmala, M., Korhonen, P., Laaksonen, A., Viisanen, Y., McGraw, R., Seinfeld, J. H.
A classical theory of the ternary homogeneous nucleation of sulfuric acid—ammonia—water is presented. For NH3 mixing ratios exceeding 1 ppt, the presence of ammonia enhances the binary (sulfuric...
ACE-2 HILLCLOUD. An overview of the ACE-2 ground-based cloud experiment. (2000)
Bower, B. K. N., Choularton, T. W., Gallagher, M. W., Beswick, K. M., Flynn, M. J., Allen, A. G., ...
The ACE‐2 HILLCLOUD experiment was carried out on the island of Tenerife in June–July 1997 to investigate the interaction of the boundary layer aerosol with a hill cap cloud forming over a ridge...
Indoor air aerosol model: transport indoors and deposition of fine and coarse particles (1989)
Raunemaa, Taisto, Kulmala, M., Saari, H., Olin, Markus
Journal of Aerosol Science Vol.11, 11 - 25
Atmospheric Chemistry and Physics Discussions (1143)
J. Damski, L. Thölix, L. Backman, J. Kaurola, P. Taalas, J. Austin, ...
A chemistry-transport model simulation of middle atmospheric ozone from 1980 to 2019 using coupled chemistry GCM winds and temperatures