石家庄市酸雨污染现状研究

Acid rain pollution situation in Shijiazhuang,Hebei province

利用1992—2005年石家庄气象站酸雨观测资料,计算了近14 a的年平均降水pH值、酸雨发生频率等反映酸雨强度的参数,分析了酸雨的变化特征以及pH平均值与气象条件、电导率、空气污染的关系。结果表明:1992—2005年石家庄年平均酸雨发生频率为8.7%;酸雨主要发生在夏、秋季,占全年的74.4%;月平均降水pH值与电导率具有相似的变化规律,显著相关系数为0.661;SO2浓度的逐年下降是石家庄市酸雨减弱的主要原因;月平均风速与月平均降水pH值相关不显著;不同降水等级酸雨的发生频率差异较大,暴雨的酸雨发生频率最高为41.67%。采用Daniel趋势检验法分析表明,石家庄酸雨污染呈下降趋势。

Based on the acid rain monitoring data of Shijiazhuang weather station from 1992 to 2005 ,annual average of rainfall pH and acid rain frequency were calculated. Acid rain characteristics and the relationships of average pH with meteorological conditions, conductivity and air pollution were analyzed. The results indicate that the frequency of annual acid rain is 8.7% in Shijiazhuang from 1992 to 2005. Acid rain often occurs in summer and autumn and accounts for 74. 4% of the whole year. The changes of monthly rainfall pH and conductivity are similar, and the correlation coefficient reaches 0.661. Acid rain decreases because of the decrease of SOz emission year by year. The correlation between monthly average wind speed and rainfall pH is not significant. The differences of acid rain occurrence frequency are large under the different rainfall grades. Acid rain occurrence frequency could reach 41.67% under the rainstorm weather conditions. According to Daniel trend test, acid rain pollution takes on decreasing trend in Shijiazhuang, Hebei province.