ACP Atmospheric Chemistry and Physics ACP Atmos. Chem. Phys. 1680-7324 Copernicus Publications Göttingen, Germany 10.5194/acp-8-7193-2008 Measurements of size-resolved hygroscopicity in the California coastal zone Hegg D. A. 1 Covert D. S. 1 Jonsson H. H. 2 Department of Atmospheric Sciences, University of Washington, Seattle, WA, USA Meteorology Department, Naval Post Graduate School, Monterey, CA, USA 09 12 2008 8 23 7193 7203 Copyright: © 2008 D. A. Hegg et al. 2008 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://acp.copernicus.org/articles/8/7193/2008/acp-8-7193-2008.html The full text article is available as a PDF file from https://acp.copernicus.org/articles/8/7193/2008/acp-8-7193-2008.pdf

Aircraft-based measurements of aerosol hygroscopicity, both in the form of size-resolved, diameter growth factors and in the dependence of particle light scattering on relative humidity, are presented for the marine boundary layer of the southern California coastal zone. The chemical composition of the aerosol is collated with the hygroscopicity data, both to examine the mechanism for the increase in aerosol hygroscopicity with altitude and as input for receptor type modeling. The data suggest an increase in aerosol hygroscopicity with altitude, possibly associated with oxidation of organic films. The receptor modeling suggests three distinct aerosol types/sources for this venue: marine, biomass burning and pollution. Model output is used in regression analyses to derive a prognostic mixing rule for the hygroscopicity of aerosol with these three sources. The mixing rule demonstrated substantial prognostic power for submicron hygroscopicity but essentially none for supermicron.

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