2007年中国区域性酸雨的若干特征

 基于中国气象局1993-2007年的酸雨观测站资料, 着重分析了2007年中国区域酸雨的特征，并和近十几年来我国区域酸雨的变化特点进行对比。与过去十几年相比，2007年全国区域酸雨的特点如下：1) 我国位于长江以南的酸雨区范围基本保持不变，但南方部分站点的酸雨强度达近十几年来的最高值；2) 我国北方尤其是华北部分地区的降水酸化明显，部分省市站点的酸雨频率和强酸雨频率达近15 a来的最高值；3) 2003-2007年，全国年均酸雨日数和酸雨量与总降水量的比值逐年上升，且增幅较为明显。2007年全国平均酸雨日数为1993年有系统观测数据以来的最高值。

An Analysis on Characteristics of Regional Acid Rain over China in 2007

Based on the observations of the acid rain network of China Meteorological Administration (CMA) from 1993 to 2007, after carefully contrast analysis, this paper draws the following three conclusions: firstly, the area of acid rain regions south of the Yangtze River in 2007 remained virtually unchanged in comparison with the past, while the intensity of acid rain in some stations reached a peak value; secondly, the rain acidity in northern China, especially in North China, increased markedly, and the frequencies of acid rain and severe acid rain in some of the stations in 2007 reached the maximum; thirdly, the average acid rain days and the ratio of acid rainfall to the total precipitation drastically increased year by year from 2004 to 2007. The average acid rain days in 2007 was the highest in the past 15 years, when the systemically observation data were available.