Zobrazeno 1 - 10
of 247
pro vyhledávání: '"L. Ahonen"'
Autor:
M. Kulmala, S. Tuovinen, S. Mirme, P. Koemets, L. Ahonen, Y. Liu, H. Junninen, T. Petäjä, V.-M. Kerminen
Publikováno v:
Aerosol Research, Vol 2, Pp 291-301 (2024)
The Cluster Ion Counter (CIC) is a simple three-channel instrument designed to observe ions in the electrical mobility equivalent diameter range from 1.0 to 5 nm. With the three channels, we can observe concentrations of both ion clusters (sub-2 nm i
Externí odkaz:
https://doaj.org/article/a8bab96808f5450d84ec1e82caa063ad
Autor:
D. Aliaga, S. Tuovinen, T. Zhang, J. Lampilahti, X. Li, L. Ahonen, T. Kokkonen, T. Nieminen, S. Hakala, P. Paasonen, F. Bianchi, D. Worsnop, V.-M. Kerminen, M. Kulmala
Publikováno v:
Aerosol Research, Vol 1, Pp 81-92 (2023)
Here we introduce a new method, termed “nanoparticle ranking analysis”, for characterizing new particle formation (NPF) from atmospheric observations. Using daily variations of the particle number concentration at sizes immediately above the cont
Externí odkaz:
https://doaj.org/article/7d74321aabe84a77bb10c4c71308890e
Autor:
D. Castarède, Z. Brasseur, Y. Wu, Z. A. Kanji, M. Hartmann, L. Ahonen, M. Bilde, M. Kulmala, T. Petäjä, J. B. C. Pettersson, B. Sierau, O. Stetzer, F. Stratmann, B. Svenningsson, E. Swietlicki, Q. Thu Nguyen, J. Duplissy, E. S. Thomson
Publikováno v:
Atmospheric Measurement Techniques, Vol 16, Pp 3881-3899 (2023)
The Portable Ice Nucleation Chamber 2 (PINCii) is a newly developed continuous flow diffusion chamber (CFDC) for measuring ice nucleating particles (INPs). PINCii is a vertically oriented parallel-plate CFDC that has been engineered to improve upon t
Externí odkaz:
https://doaj.org/article/fab85ef467cf48f984f4dac64263d53e
Autor:
D. Alfaouri, M. Passananti, T. Zanca, L. Ahonen, J. Kangasluoma, J. Kubečka, N. Myllys, H. Vehkamäki
Publikováno v:
Atmospheric Measurement Techniques, Vol 15, Pp 11-19 (2022)
Sulfuric acid and dimethylamine vapours in the atmosphere can form molecular clusters, which participate in new particle formation events. In this work, we have produced, measured, and identified clusters of sulfuric acid and dimethylamine using an e
Externí odkaz:
https://doaj.org/article/bcaa73bf0d0c40afaa22b8695c90d854
Autor:
R. Baalbaki, M. Pikridas, T. Jokinen, T. Laurila, L. Dada, S. Bezantakos, L. Ahonen, K. Neitola, A. Maisser, E. Bimenyimana, A. Christodoulou, F. Unga, C. Savvides, K. Lehtipalo, J. Kangasluoma, G. Biskos, T. Petäjä, V.-M. Kerminen, J. Sciare, M. Kulmala
Publikováno v:
Atmospheric Chemistry and Physics, Vol 21, Pp 9223-9251 (2021)
To quantify the contribution of new particle formation (NPF) to ultrafine particle number and cloud condensation nuclei (CCN) budgets, one has to understand the mechanisms that govern NPF in different environments and its temporal extent. Here, we st
Externí odkaz:
https://doaj.org/article/3c77a3f0e4bd4dc3ad0843066db0f4d2
Autor:
J. Sulo, N. Sarnela, J. Kontkanen, L. Ahonen, P. Paasonen, T. Laurila, T. Jokinen, J. Kangasluoma, H. Junninen, M. Sipilä, T. Petäjä, M. Kulmala, K. Lehtipalo
Publikováno v:
Atmospheric Chemistry and Physics, Vol 21, Pp 695-715 (2021)
The knowledge of the dynamics of sub-3 nm particles in the atmosphere is crucial for our understanding of the first steps of atmospheric new particle formation. Therefore, accurate and stable long-term measurements of the smallest atmospheric particl
Externí odkaz:
https://doaj.org/article/c54872b6c0974d67b4a349ba3a62d1db
Autor:
M. Hemmilä, H. Hellén, A. Virkkula, U. Makkonen, A. P. Praplan, J. Kontkanen, L. Ahonen, M. Kulmala, H. Hakola
Publikováno v:
Atmospheric Chemistry and Physics, Vol 18, Pp 6367-6380 (2018)
We measured amines in boreal forest air in Finland both in gas and particle phases with 1 h time resolution using an online ion chromatograph (instrument for Measuring AeRosols and Gases in Ambient Air – MARGA) connected to an electrospray ioniz
Externí odkaz:
https://doaj.org/article/f39e87b18cab48e287bec675b39db449
Autor:
C. Frege, I. K. Ortega, M. P. Rissanen, A. P. Praplan, G. Steiner, M. Heinritzi, L. Ahonen, A. Amorim, A.-K. Bernhammer, F. Bianchi, S. Brilke, M. Breitenlechner, L. Dada, A. Dias, J. Duplissy, S. Ehrhart, I. El-Haddad, L. Fischer, C. Fuchs, O. Garmash, M. Gonin, A. Hansel, C. R. Hoyle, T. Jokinen, H. Junninen, J. Kirkby, A. Kürten, K. Lehtipalo, M. Leiminger, R. L. Mauldin, U. Molteni, L. Nichman, T. Petäjä, N. Sarnela, S. Schobesberger, M. Simon, M. Sipilä, D. Stolzenburg, A. Tomé, A. L. Vogel, A. C. Wagner, R. Wagner, M. Xiao, C. Yan, P. Ye, J. Curtius, N. M. Donahue, R. C. Flagan, M. Kulmala, D. R. Worsnop, P. M. Winkler, J. Dommen, U. Baltensperger
Publikováno v:
Atmospheric Chemistry and Physics, Vol 18, Pp 65-79 (2018)
It was recently shown by the CERN CLOUD experiment that biogenic highly oxygenated molecules (HOMs) form particles under atmospheric conditions in the absence of sulfuric acid, where ions enhance the nucleation rate by 1–2 orders of magnitude. Th
Externí odkaz:
https://doaj.org/article/d748ca897f3e41cdb5e17b9c28f207cd
Autor:
J. Kontkanen, K. Lehtipalo, L. Ahonen, J. Kangasluoma, H. E. Manninen, J. Hakala, C. Rose, K. Sellegri, S. Xiao, L. Wang, X. Qi, W. Nie, A. Ding, H. Yu, S. Lee, V.-M. Kerminen, T. Petäjä, M. Kulmala
Publikováno v:
Atmospheric Chemistry and Physics, Vol 17, Iss 3, Pp 2163-2187 (2017)
The measurement of sub-3 nm aerosol particles is technically challenging. Therefore, there is a lack of knowledge about the concentrations of atmospheric sub-3 nm particles and their variation in different environments. In this study, the concentrati
Externí odkaz:
https://doaj.org/article/45ce5f8cbeba4c2783a836da8cb70b88
Autor:
J. Kangasluoma, A. Franchin, J. Duplissy, L. Ahonen, F. Korhonen, M. Attoui, J. Mikkilä, K. Lehtipalo, J. Vanhanen, M. Kulmala, T. Petäjä
Publikováno v:
Atmospheric Measurement Techniques, Vol 9, Iss 7, Pp 2977-2988 (2016)
Measuring sub-3 nm particles outside of controlled laboratory conditions is a challenging task, as many of the instruments are operated at their limits and are subject to changing ambient conditions. In this study, we advance the current understandin
Externí odkaz:
https://doaj.org/article/1046af51dcbd4696bd8270dc66641d65