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...
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...
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 L.</i>) seedlings are reported....
A. Hamed, W. Birmili, J. Joutsensaari, S. Mikkonen, A. Asmi, B. Wehner, ...
In anthropogenically influenced atmospheres, sulphur dioxide (SO2) is the main precursor of gaseous sulphuric acid (H2SO4), which in turn forms new aerosol particles (diameter <10 nm) through...
T. Anttila, P. Vaattovaara, M. Komppula, H. Lihavainen, ...
In situ measurements of aerosol water uptake and activation of aerosols into cloud droplets provide information on how aerosols influence the microphysical properties of clouds. Here we present a...
A. Hamed, W. Birmili, J. Joutsensaari, S. Mikkonen, A. Asmi, B. Wehner, ...
In anthropogenically influenced atmospheres, sulphur dioxide (SO<sub>2</sub>) is the main precursor of gaseous sulphuric acid (H<sub>2</sub>SO<sub>4</sub>), which...
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...
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...
S. V. Henriksson, E. Arjas, M. Laine, J. Tamminen, A. Laaksonen
In their paper from 2006, Annan and Hargreaves present an estimate for the uncertainty of climate sensitivity obtained by using Bayes' theorem to combine information from different sources. In this...
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...
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...
Kokkola, H., Vesterinen, M., Anttila, T., Laaksonen, A., Lehtinen, K. E. J.
In this paper, we consider the cloud drop activation of aerosol particles consisting of water soluble material and an insoluble core. Based on the Köhler theory, we derive analytical equations for...
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...
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...
Kokkola, H., Vesterinen, M., Anttila, T., Laaksonen, A., Lehtinen, K. E. J.
In this paper, we consider the cloud drop activation of aerosol particles consisting of water soluble material and an insoluble core. Based on the Köhler theory, we derive analytical equations for...
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., ...
H. Kokkola, M. Vesterinen, T. Anttila, A. Laaksonen
In this paper, we consider the cloud drop activation of aerosol particles consisting of water soluble material and an insoluble core. Based on the Köhler theory, we derive analytical equations for...
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...
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...
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...
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...
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...
T. Anttila, P. Vaattovaara, M. Komppula, H. Lihavainen, ...
In situ measurements of aerosol water uptake and activation of aerosols into cloud droplets provide information on how aerosols influence the microphysical properties of clouds. Here we present a...
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...
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
A.P. Lyubartsev, O.K. Førrisdahl, A. Laaksonen
Solvation free energy for methane, dissolved both in pure water, water/methane mixture (14 mole % methane) and in aqueous NaCl solution, is calculated using the expanded ensemble molecular dynamics...
M. Ehn, T. Petäjä, H. Aufmhoff, P. Aalto, K. Hämeri, F. Arnold, ...
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...
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...
Nucleation and growth of new particles in Po Valley, Italy (2007)
A. Hamed, J. Joutsensaari, S. Mikkonen, L. Sogacheva, M. Dal Maso, M. Kulmala, ...
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...
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...
L. Sogacheva, A. Hamed, M. C. Facchini, M. Kulmala, A. Laaksonen
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...
I. Riipinen, M. Kulmala, F. Arnold, M. Dal Maso, W. Birmili, ...
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...
Ehn, M., Petaja, T., Aufmhoff, H., Aalto, P., Hameri, K., Arnold, F., ...
Kokkola, H., Vesterinen, M., Anttila, T., Laaksonen, A., Lehtinen, K. E. J.
In this paper, we consider the cloud drop activation of aerosol particles consisting of water soluble material and an insoluble core. Based on the Köhler theory, we derive analytical equations for...
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...
Cloud droplet activation of wettable insoluble compounds has been studied theoretically by assuming droplet growth to happen through multilayer adsorption. The idea is to include an adsorption...
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...
Cloud droplet activation of wettable insoluble compounds has been studied theoretically by assuming that droplet growth happens through multilayer adsorption. The idea is to include an adsorption...
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...
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...
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...
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...
Kokkola, H., Vesterinen, M., Anttila, T., Laaksonen, A., Lehtinen, K. E. J.
In this paper, we consider the cloud drop activation of aerosol particles consisting of water soluble material and an insoluble core. Based on the Köhler theory, we derive analytical equations for...
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...
Cloud droplet activation of wettable insoluble compounds has been studied theoretically by assuming droplet growth to happen through multilayer adsorption. The idea is to include an adsorption...
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...
Cloud droplet activation of wettable insoluble compounds has been studied theoretically by assuming that droplet growth happens through multilayer adsorption. The idea is to include an adsorption...
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...
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...
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...
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...
Cloud droplet activation of wettable insoluble compounds has been studied theoretically by assuming that droplet growth happens through multilayer adsorption. The idea is to include an adsorption...
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...
Cloud droplet activation of wettable insoluble compounds has been studied theoretically by assuming droplet growth to happen through multilayer adsorption. The idea is to include an adsorption...
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...
H. Kokkola, M. Vesterinen, T. Anttila, A. Laaksonen
In this paper, we consider the cloud drop activation of aerosol particles consisting of water soluble material and an insoluble core. Based on the Köhler theory, we derive analytical equations for...
The influence of nitric acid on the cloud processing of aerosol particles (2006)
S. Romakkaniemi, H. Kokkola, A. Laaksonen
In this paper we present simulations of the effect of nitric acid (HNO3) on cloud processing of aerosol particles. Sulfuric acid (H2SO4) production and incloud coagulation are both affected by...
J. D. Allan, M. R. Alfarra, K. N. Bower, H. Coe, J. T. Jayne, D. R. Worsnop, ...
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...
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...
The effect of physical and chemical aerosol properties on warm cloud droplet activation (2006)
G. McFiggans, P. Artaxo, U. Baltensperger, H. Coe, M. C. Facchini, G. Feingold, ...
The effects of atmospheric aerosol on climate forcing may be very substantial but are quantified poorly at present; in particular, the effects of aerosols on cloud radiative properties, or the...
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. Vaattovaara, P. E. Huttunen, Y. J. Yoon, J. Joutsensaari, C. D. O'Dowd, ...
Newly-formed nanometer-sized particles have been observed at coastal and marine environments world wide. Organic species have so far not been detected in those newly-formed nucleation mode particles....
Using discriminant analysis as a nucleation event classification method (2006)
S. Mikkonen, A. Hamed, J. Joutsensaari, M. C. Facchini, A. Laaksonen
More than three years of measurements of aerosol size-distribution and different gas and meteorological parameters made in Po Valley, Italy were analysed for this study to examine which of the...
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...
The effect of physical and chemical aerosol properties on warm cloud droplet activation (2006)
McFiggans, G., Artaxo, P., Baltensperger, U., Coe, H., Facchini, M. C., Feingold, G., ...
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...
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...
Using discriminant analysis as a nucleation event classification method (2006)
Mikkonen, S., Lehtinen, K. E. J., Hamed, A., Joutsensaari, J., Facchini, M. C., Laaksonen, A.
More than three years of measurements of aerosol size-distribution and different gas and meteorological parameters made in Po Valley, Italy were analysed for this study to examine which of the...
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...
Vaattovaara, P., Huttunen, P. E., Yoon, Y. J., Joutsensaari, J., Lehtinen, K. E. J., O'Dowd, C. D., ...
Newly-formed nanometer-sized particles have been observed at coastal and marine environments worldwide. Interestingly, organic species have so far not been detected in those newly-formed nucleation...
On the hygroscopic growth of ammoniated sulfate particles of non-stoichiometric composition (2006)
Kokkola, H., Joutsensaari, J., Hyppönen, N., Lehtinen, K. E. J., Laaksonen, A.
The hygroscopic growth of ammoniated sulfate particles was studied by measurements and model calculations for particles with varying ammonium-to-sulfate ratio. In the measurements, the...
Using discriminant analysis as a nucleation event classification method (2006)
Mikkonen, S., Lehtinen, K. E. J., Hamed, A., Joutsensaari, J., Facchini, M. C., Laaksonen, A.
More than three years of measurements of aerosol size-distribution and different gas and meteorological parameters made in Po Valley, Italy were analysed for this study to examine which of the...
Vaattovaara, P., Huttunen, P. E., Yoon, Y. J., Joutsensaari, J., Lehtinen, K. E. J., O'Dowd, C. D., ...
Newly-formed nanometer-sized particles have been observed at coastal and marine environments world wide. Organic species have so far not been detected in those newly-formed nucleation mode particles....
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...
The effect of physical and chemical aerosol properties on warm cloud droplet activation (2006)
Mcfiggans, G., Artaxo, P., Baltensperger, U., Coe, H., Facchini, M. C., Feingold, G., ...
The effects of atmospheric aerosol on climate forcing may be very substantial but are quantified poorly at present; in particular, the effects of aerosols on cloud radiative properties, or the...
The influence of nitric acid on the cloud processing of aerosol particles (2006)
Romakkaniemi, S., Kokkola, H., Lehtinen, K. E. J., Laaksonen, A.
In this paper we present simulations of the effect of nitric acid (HNO3) on cloud processing of aerosol particles. Sulfuric acid (H2SO4) production and incloud coagulation are both affected by...
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...
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...
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...
Using discriminant analysis as a nucleation event classification method (2006)
Mikkonen, S., Lehtinen, K. E. J., Hamed, A., Joutsensaari, J., Facchini, M. C., Laaksonen, A.
More than three years of measurements of aerosol size-distribution and different gas and meteorological parameters made in Po Valley, Italy were analysed for this study to examine which of the...
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...
Vaattovaara, P., Huttunen, P. E., Yoon, Y. J., Joutsensaari, J., Lehtinen, K. E. J., O'Dowd, C. D., ...
Newly-formed nanometer-sized particles have been observed at coastal and marine environments worldwide. Interestingly, organic species have so far not been detected in those newly-formed nucleation...
On the hygroscopic growth of ammoniated sulfate particles of non-stoichiometric composition (2006)
Kokkola, H., Joutsensaari, J., Hyppönen, N., Lehtinen, K. E. J., Laaksonen, A.
The hygroscopic growth of ammoniated sulfate particles was studied by measurements and model calculations for particles with varying ammonium-to-sulfate ratio. In the measurements, the...
Using discriminant analysis as a nucleation event classification method (2006)
Mikkonen, S., Lehtinen, K. E. J., Hamed, A., Joutsensaari, J., Facchini, M. C., Laaksonen, A.
More than three years of measurements of aerosol size-distribution and different gas and meteorological parameters made in Po Valley, Italy were analysed for this study to examine which of the...
Vaattovaara, P., Huttunen, P. E., Yoon, Y. J., Joutsensaari, J., Lehtinen, K. E. J., O'Dowd, C. D., ...
Newly-formed nanometer-sized particles have been observed at coastal and marine environments world wide. Organic species have so far not been detected in those newly-formed nucleation mode particles....
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...
The effect of physical and chemical aerosol properties on warm cloud droplet activation (2006)
Mcfiggans, G., Artaxo, P., Baltensperger, U., Coe, H., Facchini, M. C., Feingold, G., ...
The effects of atmospheric aerosol on climate forcing may be very substantial but are quantified poorly at present; in particular, the effects of aerosols on cloud radiative properties, or the...
The influence of nitric acid on the cloud processing of aerosol particles (2006)
Romakkaniemi, S., Kokkola, H., Lehtinen, K. E. J., Laaksonen, A.
In this paper we present simulations of the effect of nitric acid (HNO3) on cloud processing of aerosol particles. Sulfuric acid (H2SO4) production and incloud coagulation are both affected by...
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...
On the hygroscopic growth of ammoniated sulfate particles of non-stoichiometric composition (2006)
H. Kokkola, J. Joutsensaari, N. Hyppönen, A. Laaksonen
The hygroscopic growth of ammoniated sulfate particles was studied by measurements and model calculations for particles with varying ammonium-to-sulfate ratio. In the measurements, the...
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...
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...
Nanoparticle formation by ozonolysis of inducible plant volatiles (2005)
J. Joutsensaari, M. Loivamäki, T. Vuorinen, P. Miettinen, J. K. Holopainen, ...
We present the first laboratory experiments of aerosol formation from oxidation of volatile organic species emitted by living plants, a process which for half a century has been known to take place...
In this work, existing and modified activity coefficient models are examined in order to assess their capabilities to describe the properties of aqueous solution droplets relevant in the atmosphere....
A method for detecting the presence of organic fraction in nucleation mode sized particles (2005)
P. Vaattovaara, M. Räsänen, T. Kühn, J. Joutsensaari, A. Laaksonen
New particle formation and growth has a very important role in many climate processes. However, the overall knowlegde of the chemical composition of atmospheric nucleation mode (particle diameter, d
Commentary on cloud modelling and the mass accommodation coefficient of water (2005)
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, this...
Effects of SO2 oxidation on ambient aerosol growth in water and ethanol vapours (2005)
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...
Parameterization of the nitric acid effect on CCN activation (2005)
S. Romakkaniemi, H. Kokkola, A. Laaksonen
In this paper we present a parameterization of the nitric acid effect on cloud droplet formation. The new parameterization is intended to be used in large scale models in order to obtain regional and...
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...
The influence of nitric acid on the cloud processing of aerosol particles (2005)
Romakkaniemi, S., Kokkola, H., Lehtinen, K. E. J., Laaksonen, A.
In this paper we present simulations of the effect of nitric acid (HNO3) on cloud processing of aerosol particles. Sulfuric acid (H2SO4) production and incloud coagulation are both affected by...
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...
The effect of physical and chemical aerosol properties on warm cloud droplet activation (2005)
Mcfiggans, G., Artaxo, P., Baltensperger, U., Coe, H., Facchini, M. C., Feingold, G., ...
The effects of atmospheric aerosol on climate forcing may be very substantial but are quantified poorly at present; in particular, the effects of aerosols on cloud radiative properties, or the...
Raatikainen, T., Laaksonen, A.
In this work, existing and modified activity coefficient models are examined in order to assess their capabilities to describe the properties of aqueous solution droplets relevant in the atmosphere....
A method for detecting the presence of organic fraction in nucleation mode sized particles (2005)
Vaattovaara, P., Räsänen, M., Kühn, T., Joutsensaari, J., Laaksonen, A.
New particle formation and growth has a very important role in many climate processes. However, the overall knowlegde of the chemical composition of atmospheric nucleation mode (particle diameter, d
Nanoparticle formation by ozonolysis of inducible plant volatiles (2005)
Joutsensaari, J., Loivamäki, M., Vuorinen, T., Miettinen, P., Holopainen, J. K., ...
We present the first laboratory experiments of aerosol formation from oxidation of volatile organic species emitted by living plants, a process which for half a century has been known to take place...
A method for detecting the presence of organic fraction in nucleation mode sized particles (2005)
Vaattovaara, P., Räsänen, M., Kühn, T., Joutsensaari, J., Laaksonen, A.
New particle formation and growth has a very important role in many climate processes. However, the overall knowlegde of the chemical composition of atmospheric nucleation mode (particle diameter, d
Raatikainen, T., Laaksonen, A.
In this work, existing and modified activity coefficient models are examined in order to assess their capabilities to describe the properties of aqueous solution droplets relevant in the atmosphere....
Nanoparticle formation by ozonolysis of inducible plant volatiles (2005)
Joutsensaari, J., Loivamäki, M., Vuorinen, T., Miettinen, P., Holopainen, J. K., ...
We present the first laboratory experiments of aerosol formation from oxidation of volatile organic species emitted by living plants, a process which for half a century has been known to take place...
Parameterization of the nitric acid effect on CCN activation (2005)
Romakkaniemi, S., Kokkola, H., Laaksonen, A.
In this paper we present a parameterization of the nitric acid effect on cloud droplet formation. The new parameterization is intended to be used in large scale models in order to obtain regional and...
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...
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...
The influence of nitric acid on the cloud processing of aerosol particles (2005)
Romakkaniemi, S., Kokkola, H., Lehtinen, K. E. J., Laaksonen, A.
In this paper we present simulations of the effect of nitric acid (HNO3) on cloud processing of aerosol particles. Sulfuric acid (H2SO4) production and incloud coagulation are both affected by...
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...
The effect of physical and chemical aerosol properties on warm cloud droplet activation (2005)
Mcfiggans, G., Artaxo, P., Baltensperger, U., Coe, H., Facchini, M. C., Feingold, G., ...
The effects of atmospheric aerosol on climate forcing may be very substantial but are quantified poorly at present; in particular, the effects of aerosols on cloud radiative properties, or the...
Raatikainen, T., Laaksonen, A.
In this work, existing and modified activity coefficient models are examined in order to assess their capabilities to describe the properties of aqueous solution droplets relevant in the atmosphere....
A method for detecting the presence of organic fraction in nucleation mode sized particles (2005)
Vaattovaara, P., Räsänen, M., Kühn, T., Joutsensaari, J., Laaksonen, A.
New particle formation and growth has a very important role in many climate processes. However, the overall knowlegde of the chemical composition of atmospheric nucleation mode (particle diameter, d
Nanoparticle formation by ozonolysis of inducible plant volatiles (2005)
Joutsensaari, J., Loivamäki, M., Vuorinen, T., Miettinen, P., Holopainen, J. K., ...
We present the first laboratory experiments of aerosol formation from oxidation of volatile organic species emitted by living plants, a process which for half a century has been known to take place...
A method for detecting the presence of organic fraction in nucleation mode sized particles (2005)
Vaattovaara, P., Räsänen, M., Kühn, T., Joutsensaari, J., Laaksonen, A.
New particle formation and growth has a very important role in many climate processes. However, the overall knowlegde of the chemical composition of atmospheric nucleation mode (particle diameter, d
Raatikainen, T., Laaksonen, A.
In this work, existing and modified activity coefficient models are examined in order to assess their capabilities to describe the properties of aqueous solution droplets relevant in the atmosphere....
Nanoparticle formation by ozonolysis of inducible plant volatiles (2005)
Joutsensaari, J., Loivamäki, M., Vuorinen, T., Miettinen, P., Holopainen, J. K., ...
We present the first laboratory experiments of aerosol formation from oxidation of volatile organic species emitted by living plants, a process which for half a century has been known to take place...
Parameterization of the nitric acid effect on CCN activation (2005)
Romakkaniemi, S., Kokkola, H., Laaksonen, A.
In this paper we present a parameterization of the nitric acid effect on cloud droplet formation. The new parameterization is intended to be used in large scale models in order to obtain regional and...
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...
Nanoparticle formation by ozonolysis of inducible plant volatiles (2005)
J. Joutsensaari, M. Loivamäki, T. Vuorinen, P. Miettinen, J. K. Holopainen, ...
We present the first laboratory experiments of aerosol formation from oxidation of volatile organic species emitted by living plants, a process which for half a century has been known to take place...
A method for detecting the presence of organic fraction in nucleation mode sized particles (2005)
P. Vaattovaara, M. Räsänen, T. Kühn, J. Joutsensaari, A. Laaksonen
New particle formation and growth has a very important role in many climate processes. However, the overall knowlegde of the chemical composition of atmospheric nucleation mode (particle diameter,...
In this work, existing and modified activity coefficient models are examined in order to assess their capabilities to describe the properties of aqueous solution droplets relevant in the atmosphere....
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...
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
Cloud condensation nucleus production from nucleation events at a highly polluted region. (2005)
Laaksonen, A., Hamed, A., Joutsensaari, J., Hiltunen, L., Cavalli, F., Junkermann, W., ...
Geophysical Research Letters, 32(2005), L06812, doi:10.1029/2004GL022092
Modelling the formation of organic particles in the atmosphere (2004)
T. Anttila, M. Kulmala, A. Laaksonen, C. D. O'Dowd
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...
The role of surfactants in Köhler theory reconsidered (2004)
R. Sorjamaa, B. Svenningsson, T. Raatikainen, S. Henning, M. Bilde, A. Laaksonen
Atmospheric aerosol particles typically consist of inorganic salts and organic material. The inorganic compounds as well as their hygroscopic properties are well defined, but the effect of organic...
Growth of upper tropospheric aerosols due to uptake of HNO3 (2004)
S. Romakkaniemi, H. Kokkola, A. Petzold, A. Laaksonen
The effect of nitric acid on the equilibrium size distributions of upper tropospheric aerosols is calculated as a function of relative humidity. It is shown that HNO3 concentrations above a few...
M. Boy, T. Petäjä, M. Dal Maso, Ü. Rannik, J. Rinne, P. Aalto, ...
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...
Boy, M., Petäjä, T., Dal Maso, M., Rannik, Ü., Rinne, J., Aalto, P., ...
Parameterization of the nitric acid effect on CCN activation (2004)
Romakkaniemi, S., Kokkola, H., Laaksonen, A.
In this paper we present a parameterization of the nitric acid effect on cloud droplet formation. The new parameterization is intended to be used in large scale models in order to obtain regional and...
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...
The role of surfactants in Köhler theory reconsidered (2004)
Sorjamaa, R., Raatikainen, T., Laaksonen, A.
Atmospheric aerosol particles typically consist of inorganic salts and organic material. The inorganic compounds as well as their hygroscopic properties are well defined, but the effect of organic...
Growth of upper tropospheric aerosols due to uptake of HNO3 (2004)
Romakkaniemi, S., Kokkola, H., Petzold, A., Laaksonen, A.
The effect of nitric acid on the equilibrium size distributions of upper tropospheric aerosols is calculated as a function of relative humidity. It is shown that HNO3 concentrations above a few...
The role of surfactants in Köhler theory reconsidered (2004)
Sorjamaa, R., Svenningsson, B., Raatikainen, T., Henning, S., Bilde, M., Laaksonen, A.
Atmospheric aerosol particles typically consist of inorganic salts and organic material. The inorganic compounds as well as their hygroscopic properties are well defined, but the effect of organic...
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...
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...
Growth of upper tropospheric aerosols due to uptake of HNO3 (2004)
Romakkaniemi, S., Kokkola, H., Petzold, A., Laaksonen, A.
The effect of nitric acid on the equilibrium size distributions of upper tropospheric aerosols is calculated as a function of relative humidity. It is shown that HNO3 concentrations above a few...
Parameterization of the nitric acid effect on CCN activation (2004)
Romakkaniemi, S., Kokkola, H., Laaksonen, A.
In this paper we present a parameterization of the nitric acid effect on cloud droplet formation. The new parameterization is intended to be used in large scale models in order to obtain regional and...
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...
The role of surfactants in Köhler theory reconsidered (2004)
Sorjamaa, R., Raatikainen, T., Laaksonen, A.
Atmospheric aerosol particles typically consist of inorganic salts and organic material. The inorganic compounds as well as their hygroscopic properties are well defined, but the effect of organic...
Growth of upper tropospheric aerosols due to uptake of HNO3 (2004)
Romakkaniemi, S., Kokkola, H., Petzold, A., Laaksonen, A.
The effect of nitric acid on the equilibrium size distributions of upper tropospheric aerosols is calculated as a function of relative humidity. It is shown that HNO3 concentrations above a few...
The role of surfactants in Köhler theory reconsidered (2004)
Sorjamaa, R., Svenningsson, B., Raatikainen, T., Henning, S., Bilde, M., Laaksonen, A.
Atmospheric aerosol particles typically consist of inorganic salts and organic material. The inorganic compounds as well as their hygroscopic properties are well defined, but the effect of organic...
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...
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...
Growth of upper tropospheric aerosols due to uptake of HNO3 (2004)
Romakkaniemi, S., Kokkola, H., Petzold, A., Laaksonen, A.
The effect of nitric acid on the equilibrium size distributions of upper tropospheric aerosols is calculated as a function of relative humidity. It is shown that HNO3 concentrations above a few...
Growth of upper tropospheric aerosols due to uptake of HNO3 (2004)
S. Romakkaniemi, H. Kokkola, A. Petzold, A. Laaksonen
The effect of nitric acid on the equilibrium size distributions of upper tropospheric aerosols is calculated as a function of relative humidity. It is shown that HNO3 concentrations above a few...
The role of surfactants in Köhler theory reconsidered (2004)
R. Sorjamaa, T. Raatikainen, A. Laaksonen
Atmospheric aerosol particles typically consist of inorganic salts and organic material. The inorganic compounds as well as their hygroscopic properties are well defined, but the effect of organic...
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...
Parameterization of the nitric acid effect on CCN activation (2004)
S. Romakkaniemi, H. Kokkola, A. Laaksonen
In this paper we present a parameterization of the nitric acid effect on cloud droplet formation. The new parameterization is intended to be used in large scale models in order to obtain regional and...
Lyubartsev, A. P., Karttunen, M., Vattulainen, I., Laaksonen, A.
We present a promising coarse-graining strategy for linking micro- and mesoscales of soft matter systems. The approach is based on effective pairwise interaction potentials obtained from detailed...
H. Kokkola, S. Romakkaniemi, A. Laaksonen
We consider the equilibrium behavior of a polydisperse aqueous droplet population as a function of relative humidity (RH) when a soluble trace gas, such as nitric acid, is present in the system. The...
On the formation of radiation fogs under heavily polluted conditions (2003)
H. Kokkola, S. Romakkaniemi, A. Laaksonen
We have studied the effect of gaseous pollutants on fog droplet growth in heavily polluted air using a model that describes time-dependent sulfate production in the liquid phase and thermodynamical...
Boy, M., Petäjä, T., Dal Maso, M., Rannik, Ü., Rinne, J., Aalto, P., ...
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,...
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...
Kokkola, H., Romakkaniemi, S., Laaksonen, A.
We consider the equilibrium behavior of a polydisperse aqueous droplet population as a function of relative humidity (RH) when a soluble trace gas, such as nitric acid, is present in the system. The...
On the formation of radiation fogs under heavily polluted conditions (2003)
Kokkola, H., Romakkaniemi, S., Laaksonen, A.
We have studied the effect of gaseous pollutants on fog droplet growth in heavily polluted air using a model that describes time-dependent sulfate production in the liquid phase and thermodynamical...
Kokkola, H., Romakkaniemi, S., Laaksonen, A.
We consider the equilibrium behavior of a polydisperse aqueous droplet population as a function of relative humidity (RH) when a soluble trace gas, such as nitric acid, is present in the system. The...
On the formation of radiation fogs under heavily polluted conditions (2003)
Kokkola, H., Romakkaniemi, S., Laaksonen, A.
We have studied the effect of gaseous pollutants on fog droplet growth in heavily polluted air using a model that describes time-dependent sulfate production in the liquid phase and thermodynamical...
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,...
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...
Kokkola, H., Romakkaniemi, S., Laaksonen, A.
We consider the equilibrium behavior of a polydisperse aqueous droplet population as a function of relative humidity (RH) when a soluble trace gas, such as nitric acid, is present in the system. The...
On the formation of radiation fogs under heavily polluted conditions (2003)
Kokkola, H., Romakkaniemi, S., Laaksonen, A.
We have studied the effect of gaseous pollutants on fog droplet growth in heavily polluted air using a model that describes time-dependent sulfate production in the liquid phase and thermodynamical...
Kokkola, H., Romakkaniemi, S., Laaksonen, A.
We consider the equilibrium behavior of a polydisperse aqueous droplet population as a function of relative humidity (RH) when a soluble trace gas, such as nitric acid, is present in the system. The...
On the formation of radiation fogs under heavily polluted conditions (2003)
Kokkola, H., Romakkaniemi, S., Laaksonen, A.
We have studied the effect of gaseous pollutants on fog droplet growth in heavily polluted air using a model that describes time-dependent sulfate production in the liquid phase and thermodynamical...
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...
H. Kokkola, S. Romakkaniemi, A. Laaksonen
We consider the equilibrium behavior of a polydisperse aqueous droplet population as a function of relative humidity (RH) when a soluble trace gas, such as nitric acid, is present in the system. The...
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...
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...
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...
J. Joutsensaari, P. Vaattovaara, M. Vesterinen, K. Hämeri, A. Laaksonen
A novel method to characterize the organic composition of aerosol particles has been developed. The method is based on organic vapor interaction with aerosol particles and it has been named an...
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...
Joutsensaari, J., Vaattovaara, P., Hämeri, K., Laaksonen, A.
A novel method to characterize the organic composition of aerosol particles has been developed. The method is based on organic vapor interaction with aerosol particles and it has been named an...
Joutsensaari, J., Vaattovaara, P., Vesterinen, M., Hämeri, K., Laaksonen, A.
A novel method to characterize the organic composition of aerosol particles has been developed. The method is based on organic vapor interaction with aerosol particles and it has been named an...
Joutsensaari, J., Vaattovaara, P., Hämeri, K., Laaksonen, A.
A novel method to characterize the organic composition of aerosol particles has been developed. The method is based on organic vapor interaction with aerosol particles and it has been named an...
Joutsensaari, J., Vaattovaara, P., Vesterinen, M., Hämeri, K., Laaksonen, A.
A novel method to characterize the organic composition of aerosol particles has been developed. The method is based on organic vapor interaction with aerosol particles and it has been named an...
J. Joutsensaari, P. Vaattovaara, K. Hämeri, A. Laaksonen
A novel method to characterize the organic composition of aerosol particles has been developed. The method is based on organic vapor interaction with aerosol particles and it has been named an...
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...
Addendum to the cloud proposal (2000)
Fastrup, B, Pedersen, E, Lillestol, E, Thorn, E, Bosteels, M, Gonidec, A, ...
A Study of the link between cosmic rays and clouds with a cloud chamber at the CERN PS (2000)
Fastrup, B, Pedersen, E, Lillestol, E, Thorn, E, Bosteels, M, Gonidec, A, ...
CLOUD: An Atmospheric research facility at CERN (2000)
Fastrup, B, Pedersen, E, Lillestol, E, Bosteels, M, Gonidec, A, Kirkby, J, ...
Calculations of Solvation Free Energies By Expanded Ensemble Method. (1996)
A.P. Lyubartsev, O.K. Førrisdahl, A. Laaksonen
The expanded ensemble method [J.Chem.Phys, 96,1776 (1992)] is applied to calculate solvation free energies for methane disolved in water at infinite dilution and at finite concentration and for...