研究论文
李如祥,莫天麟,王伟民.积云中H2O2液相氧化S（Ⅳ）的数值模拟[J].环境科学学报,1988,8(3):257-265
积云中H2O2液相氧化S（Ⅳ）的数值模拟
- A NUMERICAL SIMULATION OF AQUEOUS PHASE OXIDATION OF S(IV) BY HYDROGEN PEROXIDE IN CUMULUS CLOUDS
- 摘要：用一个液相化学反应和一维时变积云动力学过程相结合的模式,取不同的[SO2]和[H2O2],对积云发展过程中由H2O2液相氧化云中S（Ⅳ）而形成的SO42-、其它离子以及云水pH值的时空分布进行了数值模拟计算。 计算结果表明,在积云的中、上部呈现硫酸盐的高值中心和pH的低值中心,而在积云的底部,由于NH3·H2O的离解,形成高浓度的OH-和NH4+,可使云内液态水的pH值增至大于5.6;大气中SO2和H2O2浓度的改变,对云内液态水的酸化均具有重要的影响;由于化学反应的参与,H2O2使S（Ⅳ）转化成S（Ⅵ）是一复杂的非线性问题。
- Abstract：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.
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