我国酸性降水来源探讨

 我国的酸性降水存在着大气污染物的局地冲刷和中、长距离传输双重来源机制。我国南方重污染城市的酸性降水主要来源于城市高浓度大气污染物的局地冲刷；广阔区域和清洁地区的酸性降水则主要来源于大气污染物的中、长距离传输。酸性降水中局地来源和传输作用的贡献，因地而异，主要取决于当地的大气污染条件和气象条件。

Scrutiny of the sources of acid precipitation in China

Under the premise of the developing trend of global precipitation acidfication and curuent situation of acid precipitation in China,combining the analysis results of the chemical constituent of cloud water and precipitation water in China and meteorolical factors, we scrutinize the sources of China.s acid precipitation, and point out that there are two main mechanisms in China s acid precipitation including the regional washing and middle and long distance transfer of atmosphere pollutants. The analysis results show that the acid precipitation of hea ily polluted southern cities in China comes mainly from the regional washing of urban highly concentrated air pollutants,and that of large areas and clean areas comes mostly from the middle and long distance transfer;while the acid precipitation of most of cities depends on both mechanisms above.The contribution of acid precipitation regional sources and transfering is determined mainly by air pollution condition and meteorology of that area.