Differentiating natural and anthropogenic cloud condensation nuclei in the California coastal zone |
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| Authors: | By D A HEGG D S COVERT H H JONSSON R WOODS |
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| Institution: | Department of Atmospheric Sciences, University of Washington, Seattle, WA, USA;;Meteorology Department, Naval Post Graduate School, Monterey, CA, USA |
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| Abstract: | Aerosol samples were collected and cloud condensation nuclei (CCN) concentrations at five supersaturations were measured along and off the central California coast within the cloud-topped, marine boundary layer from aircraft flights during August 2007. Receptor modelling has been applied to estimate the natural versus anthropogenic source contribution of cloud condensation nuclei in this region, a region of climatically important marine stratocumulus. The results suggest that anthropogenic CCN accounted for about 50% of the CCN active at 0.3% supersaturation in this region during the measurement period. |
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