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Published May 1989 | Submitted
Journal Article Open

Cloud water chemistry in Sequoia National Park


Interception of cloudwater by forests in the Sierra Nevada Mountains may contribute significantly to acidic deposition in the region. Cloudwater sampled in Sequoia National Park had pH values ranging from 4.4 to 5.7. The advance of cold fronts into the Park appears to lead to higher aerosol and gas phase concentrations than are seen under normal mountain-valley circulations, producing higher cloud-water concentrations than might otherwise be expected. Estimates of annual deposition rates of NO_3^−, SO_4^(2−), NH_4^+ and H^+ due to cloudwater impaction are comparable to those measured in precipitation.

Additional Information

© 1989 Pergamon Press. First received 31 May 1988 and in final form 28 September 1988. We are grateful to the National Park Service, particularly the research staff at Sequoia National Park, for allowing us access to the sampling sites. This work was supported by a contract with the California Air Resources Board (Contract No. A4-075-32).

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