Cloud forming potential of secondary organic aerosol under near atmospheric conditions

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Authors
Duplissy, Jonathan
Alfarra, M. Rami
Dommen, Josef
Metzger, Axel
Prévôt, André S.H.
Laaksonen, Ari
Raatikainen, Tomi
Good, Nicholas
Author (Corporation)
Publication date
2008
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01A - Journal article
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Parent work
Geophysical Research Letters
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Volume
35
Issue / Number
3
Pages / Duration
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Publisher / Publishing institution
Wiley
Place of publication / Event location
Hoboken
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Abstract
Cloud droplets form by nucleation on atmospheric aerosol particles. Populations of such particles invariably contain organic material, a major source of which is thought to be condensation of photo‐oxidation products of biogenic volatile organic compounds (VOCs). We demonstrate that smog chamber studies of the formation of such biogenic secondary organic aerosol (SOA) formed during photo‐oxidation must be conducted at near atmospheric concentrations to yield atmospherically representative particle composition, hygroscopicity and cloud‐forming potential. Under these conditions, the hygroscopicity measured at 95% relative humidity can be used reliably to predict the CCN activity of the SOA particles by assuming droplet surface tension of pure water. We also show that the supersaturation required to activate a given size of particle decreases with age.
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550 - Geowissenschaften
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0094-8276
1944-8007
Language
English
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No
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Publication status
Published
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Peer review of the complete publication
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Closed
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Citation
DUPLISSY, Jonathan, Martin GYSEL, M. Rami ALFARRA, Josef DOMMEN, Axel METZGER, André S.H. PRÉVÔT, Ernest WEINGARTNER, Ari LAAKSONEN, Tomi RAATIKAINEN, Nicholas GOOD, S. Fiona TURNER, Gordon MCFIGGANS und Urs BALTENSPERGER, 2008. Cloud forming potential of secondary organic aerosol under near atmospheric conditions. Geophysical Research Letters. 2008. Bd. 35, Nr. 3. DOI 10.1029/2007gl031075. Verfügbar unter: https://irf.fhnw.ch/handle/11654/46688