A NUMERICAL SIMULATION OF AQUEOUS PHASE OXIDATION OF S(IV) BY HYDROGEN PEROXIDE IN CUMULUS CLOUDS
积云中H2O2液相氧化S（Ⅳ）的数值模拟

Aqueous phase oxidation of S(IV) by H2O2 in cumulus clouds was numerically simulated as an one-dimensional, time-dependent dynamic process. The temporal and the spatial variations of pH, concentrations of chemical species and sulfate produced through the oxidation under various SO2 and H2O2 concentrations were computed. The results showed that the maximal value center of sulfate and the minimal value center of pH appeared in the middle and the upper portions of the clouds and the liquid pH at the cloud base was above 5.6, due to high concentrations of OH-and NH4+ ions produced by the dissociation of NH3-H2O. The variances of SO2 and H2O2 concentrations in air played an important role in the acidification of liquid water in clouds.