1Department of Atmospheric Sciences, University of Washington, Seattle, WA, USA
2Meteorology Department, Naval Post Graduate School, Monterey, CA, USA
Received: 30 Mar 2010 – Discussion started: 28 Apr 2010
Abstract. 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.
Revised: 13 Jul 2010 – Accepted: 02 Aug 2010 – Published: 09 Aug 2010
Hegg, D. A., Covert, D. S., Jonsson, H. H., and Woods, R. K.: The contribution of anthropogenic aerosols to aerosol light-scattering and CCN activity in the California coastal zone, Atmos. Chem. Phys., 10, 7341-7351, doi:10.5194/acp-10-7341-2010, 2010.