ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-10-7341-2010 The contribution of anthropogenic aerosols to aerosol light-scattering and CCN activity in the California coastal zone Hegg D. A. 1 Covert D. S. 1 Jonsson H. H. 2 Woods R. K. 2 Department of Atmospheric Sciences, University of Washington, Seattle, WA, USA Meteorology Department, Naval Post Graduate School, Monterey, CA, USA 09 08 2010 10 15 7341 7351 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/10/7341/2010/acp-10-7341-2010.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/10/7341/2010/acp-10-7341-2010.pdf

Aircraft-based measurements of aerosol light-scattering coefficient, cloud condensation nuclei (CCN) measured directly or by proxy, and aerosol chemical composition are reported for three different years in the region of the large stratocumulus deck off the California coast. Receptor modeling is used to differentiate the contributions of the main aerosol sources to the light scattering and CCN activity. The contribution of anthropogenic sources to the two climatically important aerosol parameters (for direct and indirect forcing) varied from year to year but, on average, was found to be 67% in the case of CCN concentration and 57% in the case of light-scattering coefficient.

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