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...
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. 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....
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...
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...
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...
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....
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...
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 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...
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...
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....
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...
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 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...
Applicability of condensation particle counters to measure atmospheric clusters (2008)
Sipilä, M., Lehtipalo, K., Kulmala, M., Petäjä, T., Junninen, H., Aalto, P. P., ...
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...
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...
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...
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....
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...
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...
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...
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....
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...
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...
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...
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...
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
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...
Non-volatile residuals of newly formed atmospheric particles in the boreal forest (2007)
M. Ehn, T. Petäjä, W. Birmili, H. Junninen, P. Aalto, M. Kulmala
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....
L. Laakso, S. Gagné, T. Petäjä, A. Hirsikko, P. P. Aalto, M. Kulmala, ...
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...
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....
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...
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...
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...
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....
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...
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...
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...
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...
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....
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...
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....
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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
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 were studied based on two different methods: 1) cluster ion and particle concentration measurements, 2) external radiation and radon...
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., ...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...