I. Riipinen

Classifying previously undefined days from eleven years of aerosol-particle-size distribution data from the SMEAR II station, Hyytiälä, Finland (2009)

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...

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...

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...

Applying the Condensation Particle Counter Battery (CPCB) to study the water-affinity of freshly-formed 2–9 nm particles in boreal forest (2009)

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...

Charged and total particle formation and growth rates during EUCAARI 2007 campaign in Hyytiälä (2009)

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....

Analysis of atmospheric neutral and charged molecular clusters in boreal forest using pulse-height CPC (2009)

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...

Time span and spatial scale of regional new particle formation events over Finland and Southern Sweden (2009)

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...

Time-span and spatial-scale of regional new particle formation events over Finland and Southern Sweden (2009)

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...

Charged and total particle formation and growth rates during EUCAARI 2007 campaign in Hyytiälä (2009)

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....

Atmospheric data over a solar cycle: no connection between galactic cosmic rays and new particle formation (2009)

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...

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...

SO2 oxidation products other than H2SO4 as a trigger of new particle formation ? Part 2: Comparison of ambient and laboratory measurements, and atmospheric implications (2008)

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...

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...

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...

SO2 oxidation products other than H2SO4 as a trigger of new particle formation ? Part 2: Comparison of ambient and laboratory measurements, and atmospheric implications (2008)

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...

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...

Applicability of condensation particle counters to measure atmospheric clusters (2008)

Sipilä, M., Lehtipalo, K., Kulmala, M., Petäjä, T., Junninen, H., Aalto, P. P., ...

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...

SO₂ oxidation products other than H₂SO₄ as a trigger of new particle formation. Part 2: Comparison of ambient and laboratory measurements, and atmospheric implications (2008)

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...

SO2 oxidation products other than H2SO4 as a trigger of new particle formation. Part 2: Comparison of ambient and laboratory measurements, and atmospheric implications (2008)

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...

SO₂ oxidation products other than H₂SO₄ as a trigger of new particle formation – Part 2: Comparison of ambient and laboratory measurements, and atmospheric implications (2008)

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...

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...

Classifying previously undefined days from eleven years of aerosol-particle-size distribution data from the SMEAR II station, Hyytiälä, Finland (2008)

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...

Applying the CPCB setup to study the hygroscopicity and composition of freshly-formed 2–9 nm particles in boreal forest (2008)

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...

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...

Analysis of atmospheric neutral and charged molecular clusters in boreal forest using pulse-height CPC (2008)

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...

SO2 oxidation products other than H2SO4 as a trigger of new particle formation – Part 2: Comparison of ambient and laboratory measurements, and atmospheric implications (2008)

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...

Identification and classification of the formation of intermediate ions measured in boreal forest (2007)

A. Hirsikko, T. Bergman, L. Laakso, M. Dal Maso, I. Riipinen, U. Hõrrak, ...

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...

Connections between atmospheric sulphuric acid and new particle formation during QUEST III–IV campaigns in Heidelberg and Hyytiälä (2007)

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...

Connections between atmospheric sulphuric acid and new particle formation during QUEST III–IV campaigns in Heidelberg and Hyytiälä (2007)

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...

Connections between atmospheric sulphuric acid and new particle formation during QUEST III-IV campaigns in Heidelberg and Hyytiälä (2007)

Riipinen, I., Sihto, S. L., Kulmala, M., Arnold, F., Dal Maso, M., Birmili, W., ...

Connections between atmospheric sulphuric acid and new particle formation during QUEST III?IV campaigns in Heidelberg and Hyytiälä (2007)

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...

Identification and classification of the formation of intermediate ions measured in boreal forest (2007)

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...

Connections between atmospheric sulphuric acid and new particle formation during QUEST III?IV campaigns in Heidelberg and Hyytiälä (2007)

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...

Identification and classification of the formation of intermediate ions measured in boreal forest (2007)

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...

Atmospheric sulphuric acid and aerosol formation: implications from atmospheric measurements for nucleation and early growth mechanisms (2006)

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...

Atmospheric sulfuric acid and aerosol formation: implications from atmospheric measurements for nucleation and early growth mechanisms. (2006)

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...

Connections between atmospheric sulphuric acid and new particle formation during QUEST III?IV campaigns in Heidelberg and Hyytiälä (2006)

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...

Identification and classification of the formation of intermediate ions measured in boreal forest (2006)

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...

Atmospheric sulphuric acid and aerosol formation: implications from atmospheric measurements for nucleation and early growth mechanisms (2006)

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...

Atmospheric sulphuric acid and aerosol formation: implications from atmospheric measurements for nucleation and early growth mechanisms (2006)

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...

Connections between atmospheric sulphuric acid and new particle formation during QUEST III?IV campaigns in Heidelberg and Hyytiälä (2006)

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...

Identification and classification of the formation of intermediate ions measured in boreal forest (2006)

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...

Atmospheric sulphuric acid and aerosol formation: implications from atmospheric measurements for nucleation and early growth mechanisms (2006)

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...

Atmospheric sulphuric acid and aerosol formation: implications from atmospheric measurements for nucleation and early growth mechanisms (2006)

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...

Atmospheric sulphuric acid and aerosol formation: implications from atmospheric measurements for nucleation and early growth mechanisms (2006)

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...

Initial steps of aerosol growth (2004)

M. Kulmala, L. Laakso, I. Riipinen, M. Dal Maso, T. Anttila, ...

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...

Initial steps of aerosol growth (2004)

Kulmala, O., 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...

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...

Initial steps of aerosol growth (2004)

Kulmala, O., 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...

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...

Initial steps of aerosol growth (2004)

O. Kulmala, L. Laakso, I. Riipinen, M. Dal Maso, T. Anttila, ...

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...