Abstract
The drop size effect on the rate and mechanism of sulfur dioxide oxidation in tropospheric clouds is analyzed. In the daytime, the oxidation rate decreases as the drops grow. This effect is due to the fact that the liquid-phase reactions slow down because of a decreasing influx of oxidizing species, namely, H2O2, OH., HO.2, and O3. The effect of the nonuniformity of OH. and O3 distribution in the drop bulk on the reaction rate is discovered.
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