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Science 16 November 1984:
Vol. 226. no. 4676, pp. 829 - 831
DOI: 10.1126/science.226.4676.829
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Articles

Acid Precipitation: Natural Versus Anthropogenic Components

JAMES N. GALLOWAY 1, GENE E. LIKENS 2, and MARK E. HAWLEY 3

1 Department of Environmental Sciences, University of Virginia, Charlottesville 22903
2 Institute of Ecosystem Studies, New York Botanical Garden, Mary Flagler Cary Arboretum, Millbrook, New York 12545
3 Department of Environmental Sciences, University of Virginia

The concentrations of H+, SO42-, and NO3- in the precipitation of eastern North America are greater now than they were historically as a result of fossil-fuel combustion. Because of a lack of data prior to 1950, the absolute increases in the concentrations of these three ions are unknown. This problem can be addressed by comparing the composition of precipitation from areas sensitive to acidic deposition with that of precipitation from remote areas. An analysis of precipitation data indicates that many areas of eastern North America receive precipitation with substantially greater H+, SO42-, and NO3- concentrations than remote areas. For example, SO42-, the most ecologically significant indicator of change, is enriched 2 to 16 times in eastern North American precipitation relative to its concentration in remote areas.

Submitted on November 8, 1983
Accepted on August 2, 1984


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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