Abstract
Our research group has been continuously measuring aerosol sulfate at Whiteface Mountain, New York, since 1979 and at Mayville, New York, since 1984. Monthly aerosol SO 2− 4 concentrations for these sites are reported here through 1997. Seasonal and long-term profiles of SO 2− 4 are presented along with SO 2 concentrations. As these sites are directly downwind of the high SO 2 emission region in the Midwestern United States and the same sampling and analytical protocol has been maintained, they are ideally suited to evaluate long-term trends. The recent reductions in SO 2 emissions in response to provisions of the 1990 Clean Air Act provide an excellent opportunity to evaluate the sulfur source–receptor relationship. A linear relationship is demonstrated between aerosol SO 2− 4 and total sulfur (S T, sum of S present as SO 4 and SO 2) concentrations at these sites and SO 2 emissions upwind in the Midwest. This is the most direct evidence to date that deposition of sulfur in the Northeast is linearly related to upwind SO 2 emissions. The results support the possibility of using the ratio of SO 2− 4/SO 2 emissions to develop an empirical source–receptor relationship for the region.
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