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1.
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Size-dependent influence of NO$_{x}$ on the growth rates of organic aerosol particles
/ Yan, C (Helsinki U.) ; Nie, W (Nanjing U.) ; Vogel, A L (CERN ; PSI, Villigen) ; Dada, L (Helsinki U.) ; Lehtipalo, K (Helsinki U. ; PSI, Villigen ; Finnish Meteorological Inst.) ; Stolzenburg, D (Vienna U.) ; Wagner, R (Helsinki U.) ; Rissanen, M P (Helsinki U.) ; Xiao, M (PSI, Villigen) ; Ahonen, L (Helsinki U.) et al.
Atmospheric new-particle formation (NPF) affects climate by contributing to a large fraction of the cloud condensation nuclei (CCN). Highly oxygenated organic molecules (HOMs) drive the early particle growth and therefore substantially influence the survival of newly formed particles to CCN. [...]
2020
- Published in : Sci. Adv. 6 (2020) eaay4945
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2.
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Multicomponent new particle formation from sulfuric acid, ammonia, and biogenic vapors
/ Lehtipalo, Katrianne (U. Helsinki (main) ; PSI, Villigen ; Finnish Meteorological Inst.) ; Yan, Chao (U. Helsinki (main)) ; Dada, Lubna (U. Helsinki (main)) ; Bianchi, Federico (U. Helsinki (main)) ; Xiao, Mao (PSI, Villigen) ; Wagner, Robert (U. Helsinki (main)) ; Stolzenburg, Dominik (Vienna U.) ; Ahonen, Lauri R (U. Helsinki (main)) ; Amorim, Antonio (Lisbon, CENTRA ; Lisbon U.) ; Baccarini, Andrea (PSI, Villigen) et al.
A major fraction of atmospheric aerosol particles, which affect both air quality and climate, form from gaseous precursors in the atmosphere. Highly oxygenated organic molecules (HOMs), formed by oxidation of biogenic volatile organic compounds, are known to participate in particle formation and growth. [...]
2018 - 10 p.
- Published in : Sci. Adv. 4 (2018) eaau5363
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3.
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The role of ions in new particle formation in the CLOUD chamber
/ Wagner, Robert ; Yan, Chao ; Lehtipalo, Katrianne ; Duplissy, Jonathan ; Nieminen, Tuomo ; Kangasluoma, Juha ; Ahonen, Lauri R ; Dada, Lubna ; Kontkanen, Jenni ; Manninen, Hanna E (CERN) et al.
The formation of secondary particles in the atmosphere accounts for more than half of global cloud condensation nuclei. Experiments at the CERN CLOUD (Cosmics Leaving OUtdoor Droplets) chamber have underlined the importance of ions for new particle formation, but quantifying their effect in the atmosphere remains challenging. [...]
2017 - 17 p.
- Published in : Atmos. Chem. Phys. 17 (2017) 15181-15197
Fulltext: PDF; External link: Fulltext
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4.
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Measurement–model comparison of stabilized Criegee intermediate and highly oxygenated molecule production in the CLOUD chamber
/ Sarnela, Nina (U. Helsinki (main)) ; Jokinen, Tuija (U. Helsinki (main)) ; Duplissy, Jonathan (U. Helsinki (main)) ; Yan, Chao (U. Helsinki (main)) ; Nieminen, Tuomo (UEF, Kuopio) ; Ehn, Mikael (U. Helsinki (main)) ; Schobesberger, Siegfried (U. Helsinki (main) ; UEF, Kuopio ; U. Washington, Seattle (main)) ; Heinritzi, Martin (Goethe U., Frankfurt (main)) ; Ehrhart, Sebastian (Goethe U., Frankfurt (main)) ; Lehtipalo, Katrianne (U. Helsinki (main) ; PSI, Villigen) et al.
Atmospheric oxidation is an important phenomenon which produces large quantities of low-volatility compounds such as sulfuric acid and oxidized organic compounds. Such species may be involved in the nucleation of particles and enhance their subsequent growth to reach the size of cloud condensation nuclei (CCN). [...]
2018 - 18 p.
- Published in : Atmos. Chem. Phys. 18 (2018) 2363-2380
Fulltext: PDF; External link: Fulltext
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5.
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Insight into Acid–Base Nucleation Experiments by Comparison of the Chemical Composition of Positive, Negative, and Neutral Clusters
/ Bianchi, Federico (PSI, Villigen) ; Praplan, Arnaud P (Helsinki U.) ; Sarnela, Nina (Helsinki U.) ; Dommen, Josef (PSI, Villigen) ; Kürten, Andreas (Goethe U., Frankfurt (main)) ; Ortega, Ismael K (Lille U.) ; Schobesberger, Siegfried (Helsinki U.) ; Junninen, Heikki (Helsinki U.) ; Simon, Mario (Goethe U., Frankfurt (main)) ; Tröstl, Jasmin (PSI, Villigen) et al.
We investigated the nucleation of sulfuric acid together with two bases (ammonia and dimethylamine), at the CLOUD chamber at CERN. The chemical composition of positive, negative, and neutral clusters was studied using three Atmospheric Pressure interface-Time Of Flight (APi-TOF) mass spectrometers: two were operated in positive and negative mode to detect the chamber ions, while the third was equipped with a nitrate ion chemical ionization source allowing detection of neutral clusters. [...]
2014 - 10 p.
- Published in : Environ. Sci. Technol. 48 (2014) 13675-13684
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6.
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Modeling the thermodynamics and kinetics of sulfuric acid-dimethylamine-water nanoparticle growth in the CLOUD chamber
/ Ahlm, L (ACES, Stockholm University) ; Yli-Juuti, T (UEF, Kuopio) ; Schobesberger, S (Helsinki U. ; Washington U., Seattle) ; Praplan, A P (Helsinki U.) ; Kim, J (UEF, Kuopio) ; Tikkanen, O -P (UEF, Kuopio ; Helsinki U.) ; Lawler, M J (UC, Irvine) ; Smith, J N (UEF, Kuopio ; UC, Irvine) ; Tröstl, J (PSI, Villigen) ; Acosta Navarro, J C (ACES, Stockholm University) et al.
Dimethylamine (DMA) has a stabilizing effect on sulfuric acid (SA) clusters, and the SA and DMA molecules and clusters likely play important roles in both aerosol particle formation and growth in the atmosphere. We use the monodisperse particle growth model for acid-base chemistry in nanoparticle growth (MABNAG) together with direct and indirect observations from the CLOUD4 and CLOUD7 experiments in the cosmics leaving outdoor droplets (CLOUD) chamber at CERN to investigate the size and composition evolution of freshly formed particles consisting of SA, DMA, and water as they grow to 20 nm in dry diameter [...]
2016 - 16 p.
- Published in : Aerosol Sci. Technol. 50 (2016) 1017-1032
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7.
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Unexpectedly acidic nanoparticles formed in dimethylamine–ammonia–sulfuric-acid nucleation experiments at CLOUD
/ Lawler, Michael J (UC, Irvine (main)) ; Winkler, Paul M (Vienna U.) ; Kim, Jaeseok (UEF, Kuopio ; Korea Polar Research Institute, Republic of Korea) ; Ahlm, Lars (Stockholm U.) ; Tröstl, Jasmin (PSI, Villigen) ; Praplan, Arnaud P (Helsinki U. ; Finnish Meteorological Inst.) ; Schobesberger, Siegfried (Helsinki U. ; Washington U., Seattle) ; Kürten, Andreas (Goethe U., Frankfurt (main)) ; Kirkby, Jasper (Goethe U., Frankfurt (main) ; CERN) ; Bianchi, Federico (Helsinki U.) et al.
New particle formation driven by acid–base chemistry was initiated in the CLOUD chamber at CERN by introducing atmospherically relevant levels of gas-phase sulfuric acid and dimethylamine (DMA). Ammonia was also present in the chamber as a gas-phase contaminant from earlier experiments [...]
2016 - 18 p.
- Published in : Atmosph. Chem. Phys. 16 (2016) 13601-13618
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8.
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The effect of acid–base clustering and ions on the growth of atmospheric nano-particles
/ Lehtipalo, Katrianne (Helsinki U. ; PSI, Villigen) ; Rondo, Linda (Frankfurt U.) ; Kontkanen, Jenni (Helsinki U.) ; Schobesberger, Siegfried (Helsinki U. ; Washington U., Seattle) ; Jokinen, Tuija (Helsinki U.) ; Sarnela, Nina (Helsinki U.) ; Kürten, Andreas (Frankfurt U.) ; Ehrhart, Sebastian (Frankfurt U. ; CERN) ; Franchin, Alessandro (Helsinki U.) ; Nieminen, Tuomo (Helsinki U.) et al.
The growth of freshly formed aerosol particles can be the bottleneck in their survival to cloud condensation nuclei. It is therefore crucial to understand how particles grow in the atmosphere. [...]
2016
- Published in : Nature Commun. 7 (2016) 11594
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9.
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Global atmospheric particle formation from CERN CLOUD measurements
/ Dunne, E M (Leeds U.) ; Gordon, H (CERN) ; Kurten, A ; Almeida, J ; Duplissy, J ; Williamson, C ; Ortega, I K ; Pringle, K J ; Adamov, A ; Baltensperger, U et al.
/CLOUD
Fundamental questions remain about the origin of newly formed atmospheric aerosol particles because data from laboratory measurements have been insufficient to build global models. In contrast, gas-phase chemistry models have been based on laboratory kinetics measurements for decades. [...]
2016 - 6 p.
- Published in : Science 354 (2016) 1119-1124
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