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Calculations are presented that simulate the free radical chemistries of the gas phase and aqueous phase within a warm cloud during midday. It is demonstrated that in the presence of midday solar fluxes the heterogeneous scavenging of OH and HO 2 from the gas phase by cloud droplets can represent a major source of free radicals to cloud water, provided the accommodation or sticking coefficient for these species impinging upon water droplets is ≥10 −4 . The aqueous‐phase HO 2 radicals are found to be converted to H 2 O 2 by aqueous‐phase chemical reactions at a rate that suggests that this mechanism could produce a significant fraction of the H 2 O 2 found in cloud droplets. The rapid oxidation of sulfur species dissolved in cloudwater by this free‐radical‐produced H 2 O 2 as well as by aqueous‐phase OH radicals could conceivably have a significant impact upon the chemical composition of rain.
Chameides et al. (Sun,) studied this question.
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