Project at a Glance

Title: Acid deposition monitoring in an alpine snowpack.

Principal Investigator / Author(s): Dawson, Daniel R

Contract Number: A4-038-32

Research Program Area: Ecosystem & Multimedia Effects

Topic Areas: Acid Deposition, Ecosystem Impacts, Monitoring


Regular weekly sampling and chemical analysis of rain, snow and dry deposition was carried out at a site 3,000 m ASL on Mammoth Mountain as part of the Air Resources Board's California Acid Deposition Monitoring Program (CADMP). The site was used for event sampling of precipitation for the three previous years. The site is significant in that it is typical of a wide range of the alpine region of the Sierra Nevada. Precipitation chemistry followed the pattern of the three previous years with mildly acidic summer rainstorms and very dilute snow with little acid. Four methods of collecting snow, including the standard ARB Network wet/dry collector were compared in an effort to devise an improved, standardized method for handling the unique conditions of an alpine site. These include high winds and high precipitation accumulations. None of the methods were satisfactory as a final solution. The failure of the wet/dry collector to handle these conditions was documented.

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

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