不同天气系统下我国云雨水化学特征的研究

Study on Cloudwater and Rainwater Chemical Characteristics under Different Weather System over China

根据 1985— 1993年在我国 10个省市飞机观测的云水化学资料 ,分析了不同天气系统对我国云、雨水化学特征的影响。平均而言 ,我国北方地区云水不酸 ,南方地区云水酸。降水天气系统对云化学组分有一定的影响。北方地区受蒙古低涡影响时 ,云水中Ca2 + 明显增多 ,表现了沙尘污染的特征 ;南方地区静止锋降水时 ,云水酸 。

The cloudwater chemistry was analyzed over nearly 10 provinces and cities in China from 1985 to 1993. The results indicate that the cloudwater is acidic at South but non acidic at North China. The chemical species of cloudwater is affected by precipitation weather system. In North China, when it was influenced by Mongolia low eddy, the cation of Ca 2+ increased to very high which demonstrate the yellow sand pollution process. In South China, when it influenced by stationary front precipitation system, the cloudwater is acidic and concentration of ion is also high.