太原地区近15年降水pH值时空分布特征分析

Analysis on the Space-time Distribution Characteristics of Precipitation pH Value in Recent 15 Years in Taiyuan Area

利用山西省观象台太原基准站1995—2009年的酸雨观测资料,统计了近15年来降水酸度的时间分布特征,包括年均pH值和酸雨发生频率的变化。分析了酸雨逐年、逐月变化情况,分析表明太原市酸雨呈逐年曲折式上升趋势,具有春季2、3月份与秋季9月份pH值明显偏低的季节变化特点。

By using the acid rain observation data collected by Taiyuan Benchmark Station of Shanxi Observatory in the period of 1995-2009,this paper makes the statistical analysis on the space-time distribution characteristics of the precipitation acidity in recent 15 years including the variations of average annual pH value and acid rain occurring frequency,and analyzes the variations of acid rain year after year and month to month,showing that the acid rain in Taiyuan City presents winding type rising trend year after year,and the pH value possesses the seasonal variation characteristics being obviously lower in February and March of spring season and in September of autumn season.