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Project at a Glance

Project Status: complete

Title: Characterization of the composition and three dimensional distribution of acidity in Southern California clouds

Principal Investigator / Author(s): Richards, L W

Contractor: Sonoma Technology, Inc

Contract Number: A2-125-32

Research Program Area: Atmospheric Processes

Topic Areas: Acid Deposition


Sonoma Technology, Inc. (STI) conducted a study in 1983 and 1984 for the California Air Resources Board in which an aircraft was used to collect cloud water samples, filter samples of submicron aerosol, and to make other air quality and meteorological measurements in stratus clouds in the Los Angeles Basin. This study continued the research on Los Angeles Basin stratus begun by ST1 in 1982.

The results and conclusion from this study are presented in the form of observations which support or qualify the statement. The statement are primarily based on the observations made while flying in stratus clouds on three consecutive days in June 1984. These clouds were found in a narrow range of altitudes near 3000 ft msl. Stratus clouds frequently form in May and June in the Los Angeles Basin, and the conditions at the time the samples were collected are believed to be representative of such cloudy nights. However, it is not possible to know how closely this small data set represents the current average conditions existing in the stratus clouds which form in the late spring.


For questions regarding this research project, including available data and progress status, contact: Research Division staff at (916) 445-0753

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