Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 8 16 2008 10.5194/acp-8-4683-2008 http://www.atmos-chem-phys.net/8/4683/2008/ http://www.atmos-chem-phys.net/8/4683/2008/acp-8-4683-2008.html http://www.atmos-chem-phys.net/8/4683/2008/acp-8-4683-2008.pdf 4683 4690 2008-08-18 Changes of fatty acid aerosol hygroscopicity induced by ozonolysis under humid conditions O. Vesna S. Sjogren E. Weingartner V. Samburova M. Kalberer H. W. Gäggeler M. Ammann markus.ammann@psi.ch Laboratory of Radio- and Environmental Chemistry, Paul Scherrer Inst., Villigen, Switzerland Department of Chemistry and Biochemistry, University of Bern, Bern, Switzerland Laboratory of Atmospheric Chemistry, Paul Scherrer Institut, Villigen, Switzerland Institute of Organic Chemistry, ETH Zürich, Zürich, Switzerland Unsaturated fatty acids are important constituents of the organic fraction of atmospheric aerosols originating from biogenic or combustion sources. Oxidative processing of these may change their interaction with water and thus affect their effect on climate. The ozonolysis of oleic and arachidonic acid aerosol particles was studied under humid conditions in a flow reactor at ozone exposures close to atmospheric levels, at concentrations between 0.5 and 2 ppm. While oleic acid is a widely used proxy for such studies, arachidonic acid represents polyunsaturated fatty acids, which may decompose into hygroscopic products. The hygroscopic (diameter) growth factor at 93% relative humidity (RH) of the oxidized arachidonic particles increased up to 1.09 with increasing RH during the ozonolysis. In contrast, the growth factor of oleic acid was very low (1.03 at 93% RH) and was almost invariant to the ozonolysis conditions, so that oleic acid is not a good model to observe oxidation induced changes of hygroscopicity under atmospheric conditions. 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