2005-2011全国酸雨状况分析

根据全国酸雨监测网2005-2011年的监测数据对全国酸雨状况进行分析,得出全国酸雨城市比例、酸雨发生频率及酸雨覆盖面积总体均呈降低趋势,但酸雨形式依然严峻,酸雨类型仍以硫酸型酸雨为主,硝酸盐对降水酸度的贡献逐年增加。与2005年相比,全国硫沉降通量总体呈现下降趋势,硝酸根沉降通量略有增加。中国降水pH年均值与美国、日本及其他东亚酸沉降监测网成员国相当,但主要致酸离子的酸沉降通量处于较高水平。

Analysis on the Acid Rain from 2005 to 2011 in China

The monitoring data on the acid rain from 2005 to 2011 in China were studied. The ratio of acid rain city, the frequency and area of acid rain were decreasing, however situation was still severe. The type of acid rain was mainly sulfuric acid rain, and the contribution of nitrate to precipitation acidity was increasing year by year. The sulfur deposition flux showed decreasing trend and the nitrate deposition flux showed increasing trend compared with those in 2005. The annual pH value was at the same level with the USA, Japan and other East Asian countries, however the deposition flux of the major acidic ions was at a high level.