Organic Composition of Fogs and Clouds

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This project is developing methods for studying the organic composition of clouds and fogs and the efficiency with which clouds and fogs scavenge carbonaceous aerosol particles. The project includes a laboratory development effort to improve capabilities for measuring concentrations of the diverse organic species suspected to be present in cloud and fog drops and a series of field experiments to collect samples suitable for application of the developed suite of organic analytical techniques. The field campaigns are being used to collect samples of cloud/fog types that are seasonally important in three distinct environments: winter radiation fogs in the California's Central Valley, spring stratus clouds intercepting the coastal hills of Southern California, and summer orographic clouds intercepting the western slope of the Rocky Mountains.