Abstract
A simple storm model is used to provide a qualitative estimate of the concentration of oxidant and SO 2 required to produce rainwater with a chemical composition as observed by the MAP3S monitoring network. The essential features of this model are that planetary boundary layer air is pseudo-adiabatically lifted, the chemical composition of the resulting condensed water is assumed to be identical to that observed on the ground, and a fraction of the sulfate found in precipitation is attributed to in-cloud oxidation of SO 2. According to this model, average summer precipitation is stoichiometrically related to a gas phase SO 2 and oxidant concentration of between 3.3 and 4.7 ppb. Possible sources of H 2O 2 are examined.
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