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 sup−inf4 varied by up to a factor of 9, and those in rainwater by a factor of 3 on the average. Generally, SO sup−inf4 concentration patterns in air and rainwater were similar, and consistent with wind direction and the location of sources. Direct relationships between SO sup−inf4 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 sup−inf4 pattern plus consideration of possible sources of SO sup−inf4 suggests that nucleation of SO sup−inf4 particles must be a major cause of S scavenging, with some possible influence from sub-cloud impaction.
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Bridgman, H.A. Mesoscale spatial variability of sulfate in air and rainwater at St. Louis. Water Air Soil Pollut 22, 153–172 (1984). https://doi.org/10.1007/BF00163096
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DOI: https://doi.org/10.1007/BF00163096