Cloud forming potential of secondary organic aerosol under near atmospheric conditions

J. Duplissy; M. Gysel; M. R. Alfarra; J. Dommen; A. Metzger; A. S. H. Prevot; E. Weingartner; A. Laaksonen; T. Raatikainen; N. Good; S. F. Turner; G. McFiggans; U. Baltensperger

doi:10.1029/2007GL031075

Cloud forming potential of secondary organic aerosol under near atmospheric conditions

J. Duplissy, M. Gysel, M. R. Alfarra, J. Dommen, A. Metzger, A. S. H. Prevot, E. Weingartner, A. Laaksonen, T. Raatikainen, N. Good, S. F. Turner, G. McFiggans, U. Baltensperger

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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.

Original language	English
Article number	L03818
Number of pages	5
Journal	Geophysical Research Letters
Volume	35
Issue number	3
DOIs	https://doi.org/10.1029/2007GL031075
Publication status	Published - 15 Feb 2008

Keywords

BIOGENIC AEROSOL
CHAMBER
PHOTOOXIDATION
AEROSOL
HYGROSCOPICITY

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10.1029/2007GL031075

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Duplissy, J., Gysel, M., Alfarra, M. R., Dommen, J., Metzger, A., Prevot, A. S. H., Weingartner, E., Laaksonen, A., Raatikainen, T., Good, N., Turner, S. F., McFiggans, G., & Baltensperger, U. (2008). Cloud forming potential of secondary organic aerosol under near atmospheric conditions. Geophysical Research Letters, 35(3), Article L03818. https://doi.org/10.1029/2007GL031075

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title = "Cloud forming potential of secondary organic aerosol under near atmospheric conditions",

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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AU - Duplissy, J.

AU - Gysel, M.

AU - Alfarra, M. R.

AU - Dommen, J.

AU - Metzger, A.

AU - Prevot, A. S. H.

AU - Weingartner, E.

AU - Laaksonen, A.

AU - Raatikainen, T.

AU - Good, N.

AU - Turner, S. F.

AU - McFiggans, G.

AU - Baltensperger, U.

PY - 2008/2/15

Y1 - 2008/2/15

N2 - 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.

AB - 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.

KW - BIOGENIC AEROSOL

KW - CHAMBER

KW - PHOTOOXIDATION

KW - AEROSOL

KW - HYGROSCOPICITY

U2 - 10.1029/2007GL031075

DO - 10.1029/2007GL031075

M3 - Article

SN - 0094-8276

VL - 35

JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 3

M1 - L03818

ER -

Cloud forming potential of secondary organic aerosol under near atmospheric conditions

Abstract

Keywords

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