Mesoscale spatial variability of sulfate in air and rainwater at St. Louis |
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| Authors: | Howard A Bridgman |
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| Institution: | 1. Visiting Scientist, Illinois State Water Survey, USA
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| Abstract: | Sulfate concentrations in rainwater and in air measured on four summer days at St. Louis were highly variable, both spatially or temporally. Maximum/minimum ratios of aerosol SO inf4 sup? varied by up to a factor of 9, and those in rainwater by a factor of 3 on the average. Generally, SO inf4 sup? concentration patterns in air and rainwater were similar, and consistent with wind direction and the location of sources. Direct relationships between SO inf4 sup? in air and in water were evident on two of the individual days, but not for all days together. The non-uniformity of the SO inf4 sup? pattern plus consideration of possible sources of SO inf4 sup? suggests that nucleation of SO inf4 sup? particles must be a major cause of S scavenging, with some possible influence from sub-cloud impaction. |
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