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1.
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New particle formation from isoprene under upper-tropospheric conditions
/ Shen, Jiali (Helsinki U.) ; Russell, Douglas M (Frankfurt U., FIAS) ; DeVivo, Jenna (Carnegie Mellon U.) ; Kunkler, Felix (Mainz, Max Planck Inst.) ; Baalbaki, Rima (Helsinki U.) ; Mentler, Bernhard (Innsbruck U.) ; Scholz, Wiebke (Innsbruck U.) ; Yu, Wenjuan (Helsinki U.) ; Caudillo-Plath, Lucía (Frankfurt U., FIAS) ; Sommer, Eva (CERN ; Vienna U.) et al.
Abstract
Aircraft observations have revealed ubiquitous new particle formation in the tropical upper troposphere over the Amazon1,2 and the Atlantic and Pacific oceans3,4. Although the vapours involved remain unknown, recent satellite observations have revealed surprisingly high night-time isoprene mixing ratios of up to 1 part per billion by volume (ppbv) in the tropical upper troposphere5. [...]
2024 - 9 p.
- Published in : Nature 636 (2024) 115-123
Fulltext: PDF; External link: Interactions.org
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2.
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Potential pre-industrial–like new particle formation induced by pure biogenic organic vapors in Finnish peatland
/ Huang, Wei (Helsinki U.) ; Junninen, Heikki (Tartu, Inst. Phys.) ; Garmash, Olga (Tampere U. of Tech. ; Washington U., Seattle) ; Lehtipalo, Katrianne (Helsinki U.) ; Stolzenburg, Dominik (TU Vienna) ; Lampilahti, Janne L P (Helsinki U.) ; Ezhova, Ekaterina (Helsinki U.) ; Schallhart, Simon (STUK, Helsinki) ; Rantala, Pekka (Helsinki U.) ; Aliaga, Diego (Helsinki U.) et al.
Pure biogenic new particle formation (NPF) induced by highly oxygenated organic molecules (HOMs) could be an important mechanism for pre-industrial aerosol formation. However, it has not been unambiguously confirmed in the ambient due to the scarcity of truly pristine continental locations in the present-day atmosphere or the lack of chemical characterization of NPF precursors. [...]
2024 - 11 p.
- Published in : Sci. Adv. 10 (2024) adm9191
Fulltext: PDF;
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3.
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Atmospheric new particle formation from the CERN CLOUD experiment
/ Kirkby, Jasper (CERN) ; Amorim, António ; Baltensperger, Urs ; Carslaw, Kenneth S ; Christoudias, Theodoros ; Curtius, Joachim ; Donahue, Neil M ; Haddad, Imad El ; Flagan, Richard C ; Gordon, Hamish et al.
Aerosol particles in the atmosphere profoundly influence public health and climate. Ultrafine particles enter the body through the lungs and can translocate to essentially all organs, and they represent a major yet poorly understood health risk. [...]
2023 - 10 p.
- Published in : Nature Geo. 16 (2023) 948-957
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4.
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Role of iodine oxoacids in atmospheric aerosol nucleation
/ He, Xu-Cheng (Helsinki U.) ; Tham, Yee Jun (Helsinki U.) ; Dada, Lubna (Helsinki U.) ; Wang, Mingyi (Carnegie Mellon U.) ; Finkenzeller, Henning (U. Colorado, Boulder) ; Stolzenburg, Dominik (Vienna U. ; Helsinki U.) ; Iyer, Siddharth (Tampere U. of Tech.) ; Simon, Mario (Frankfurt U., FIAS) ; Kürten, Andreas (Frankfurt U., FIAS) ; Shen, Jiali (Helsinki U.) et al.
Iodic acid (HIO3) is known to form aerosol particles in coastal marine regions, but predicted nucleation and growth rates are lacking. Using the CERN CLOUD (Cosmics Leaving Outdoor Droplets) chamber, we find that the nucleation rates of HIO3 particles are rapid, even exceeding sulfuric acid–ammonia rates under similar conditions. [...]
2021 - 7 p.
- Published in : Science 371 (2021) 589-595
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5.
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Influence of temperature on the molecular composition of ions and charged clusters during pure biogenic nucleation
/ Frege, Carla (PSI, Villigen) ; Ortega, Ismael K ; Rissanen, Matti P ; Praplan, Arnaud P ; Steiner, Gerhard ; Heinritzi, Martin ; Ahonen, Lauri ; Amorim, António ; Bernhammer, Anne-Kathrin ; Bianchi, Federico et al.
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. The biogenic HOMs were produced from ozonolysis of α-pinene at 5 °C. [...]
2018 - 15 p.
- Published in : Atmos. Chem. Phys. 18 (2018) 65-79
Fulltext: PDF;
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6.
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Characterization of positive clusters in the CLOUD nucleation experiments
/ Bianchi, Federico (PSI, Villigen) ; Tröstl, Jasmin (PSI, Villigen) ; Schobesberger, Siegfried (Helsinki U.) ; Junninen, Heikki (Helsinki U.) ; Dommen, Josef (PSI, Villigen) ; Worsnop, Douglas R (Helsinki U.) ; Baltensperger, Urs (PSI, Villigen)
/CLOUD
The mechanism of new particle formation (NPF) events is still poorly understood. The CLOUD experiment is studying at which conditions this process occurs. [...]
2013 - 4 p.
- Published in : AIP Conf. Proc. 1527 (2013) 346-349
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7.
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Nucleation of H2SO4 and oxidized organics in CLOUD experiment
/ Sipilä, Mikko (Helsinki U.) ; Sarnela, Nina (Helsinki U.) ; Jokinen, Tuija (Helsinki U.) ; Nieminen, Tuomo (Helsinki U.) ; Almeida, Joao (Frankfurt U.) ; Tröstl, Jasmin (PSI, Villigen) ; Lehtipalo, Katrianne (Helsinki U.) ; Duplissy, Jonathan (Helsinki U.) ; Junninen, Heikki (Helsinki U.)
/CLOUD
The research of atmospheric new particle formation has proceeded lately as the role of sulphuric acid has been established. Still, the roles of other atmospheric compounds in nucleation remain largely unclear. [...]
2013 - 4 p.
- Published in : AIP Conf. Proc. 1527 (2013) 318-321
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8.
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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
Fulltext: PDF;
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9.
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Reduced anthropogenic aerosol radiative forcing caused by biogenic new particle formation
/ Gordon, Hamish (CERN) ; Sengupta, Kamalika (U. Leeds (main)) ; Rap, Alexandru (U. Leeds (main)) ; Duplissy, Jonathan (Helsinki Inst. of Phys.) ; Frege, Carla (PSI, Villigen) ; Williamson, Christina (Goethe U., Frankfurt (main) ; Colorado U., CIRES ; NCAR, Boulder) ; Heinritzi, Martin (Goethe U., Frankfurt (main)) ; Simon, Mario (Goethe U., Frankfurt (main)) ; Yan, Chao (Helsinki U.) ; Almeida, João (CERN ; Goethe U., Frankfurt (main)) et al.
2016
- Published in : Proc. Natl. Acad. Sci. U. S. A. 113 (2016) 12053-12058
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10.
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The role of low-volatility organic compounds in initial particle growth in the atmosphere
/ Tröstl, Jasmin (PSI, Villigen) ; Chuang, Wayne K (Carnegie Mellon U. (main)) ; Gordon, Hamish (CERN) ; Heinritzi, Martin (Goethe U., Frankfurt (main)) ; Yan, Chao (Helsinki U.) ; Molteni, Ugo (PSI, Villigen) ; Ahlm, Lars (Stockholm U. (main)) ; Frege, Carla (PSI, Villigen) ; Bianchi, Federico (PSI, Villigen ; Helsinki U. ; ETH, Zurich (main)) ; Wagner, Robert (Helsinki U.) et al.
About half of present-day cloud condensation nuclei originate from atmospheric nucleation, frequently appearing as a burst of new particles near midday. Atmospheric observations show that the growth rate of new particles often accelerates when the diameter of the particles is between one and ten nanometres. [...]
2016
- Published in : Nature 533 (2016) 527-531
NPG Open Access article: PDF;
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