积云化学模式的研究

A STUDY ON THE MODEL OF CUMULUS CHEMISTRY

考虑云的动力和微物理过程对化学过程的影响,建立了一维时变暖积云化学模式.着重研究了积云酸化的特点和降水中硫酸盐来源的相对重要性.结果表明:SO_2的液相氧化、核化清除以及雨水对气溶胶的冲刷作用是硫酸盐湿沉降的主要来源。特别是在对流旺盛的积云中,SO_2在雨水中的氧化反应是硫酸盐的重要来源。

I-D time-dependent model of warm cumulus chemistry was established to clarify the effects of the dynamic and microphysical processes on the chemical process in the cumulus. The main features of cumulus acidification and relative importance of sources of sulfate in the rainwater were studied. The results show that the main sources of wet deposit of sulfate include aqueous oxidation of SO_2, nucleaton scavenging and below-cloud impact of aerosol by raindrop. Especially for the cumulus with strong convection, the oxidation reaction of SO_2 in the rainwater plays an important role in the formation of sulfate related to the cumulus.