Journal
ATMOSPHERIC ENVIRONMENT
Volume 35, Issue 32, Pages 5657-5661Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S1352-2310(01)00252-7
Keywords
sulfates; acid precipitation; trend detection; NADP; space-time analysis
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This paper illustrates a simple technique of performing space-time analysis of precipitation-weighted SO42- concentration data across the eastern US that were collected by the National atmospheric deposition program. Using a moving average filter and two-dimensional spatial data filtering algorithm on the time series of precipitation-weighted SO42- concentrations, we show that decreases of about 50% have occurred in SO42- concentrations in Minnesota, Wisconsin, and over the northeastern US between 1985 and 1998, generally consistent with SO2 emissions' reductions SO2 over this period. The decreases in 4 concentrations tended to be smaller in the midwest and south. (C) 2001 Elsevier Science Ltd. All rights reserved.
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