Abstract
Cloud collection principles are briefly reviewed; the performance of two collectors in common use is compared. Two cloud event studies (one during winter, the other during summer) are presented to contrast typical time-dependent histories of chemical concentrations for the two seasons. During winter, the oxidation rate of SO 2 is low, resulting in measured sulfate concentrations independent of SO 2 concentrations. During summer, SO 2 is rapidly oxidized by H 2 O 2 with a residue of H 2 O 2 persisting in cloud water after SO 2 has been converted. Changes in the gas phase concentrations of SO 2 and H 2 O 2 are shown during a cloud event. Both gases drop to very low concentrations in cloud with H 2 O 2 tending to recover after available SO 2 has been oxidized. The meteorology for each event is presented to illustrate the role of atmospheric structure in the transporting of emitted material and in determining cloud water compositions. Finally, a cloud chemistry climatology for winter and summer is presented, based upon 6 years of observations at Whiteface Mountain. DOI: 10.1111/j.1600-0889.1989.tb00127.x
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