临沂市酸雨特征及其与气象条件的关系

根据临沂市气象观测站2003-2013年11年间617次酸雨观测资料,计算和分析了临沂降水pH值、酸雨频率的年际和季节变化特征,研究了酸雨与风向、风速等气象条件的关系。结果表明,临沂市11年间酸雨平均pH值为4.84,酸雨频率为47.0豫,2003-2013年间酸雨频率呈下降趋势。季节变化特征为秋季和冬季酸雨频率较大,春季和夏季酸雨频率较小,表明秋、冬季两季的酸雨污染比春、夏两季严重。当风速≤3.0 m/s时,酸雨发生频率达67.6豫,随着风速的增大,酸雨发生频率越来越小。当风向为偏东北风和偏东南风时,酸雨发生的机会偏大。

Characteristcs of Acid Rain in Linyi City and Its Relationship with Meteorological Conditions

According to the 617 acid rain observation data of 11 years during 2003 to 2013 of Linyi meteorological observation,the interannual and seasonal variability characteristics of Linyi precipitation pH value, the frequency of acid rain, acid rain and the wind, the wind and other weather conditions were analyzed and calculated. The results showed that ,the average acid rain pH value of 11 years in Linyi City was 4.84 ,acid rain frequency was 47.0% ,the frequency of acid rain decreased during 2003 to 2013. Seasonal varlation characteristics was the frequency of acid rain in autumn and winter was high, the frequency of acid rain in spring and summer was small, showed that acid rain pollution in autumn and winter was more serious than in spring and summer. When the wind speed was ≤ 3.0 m/s, acid rain frequency was 67.6%, with the increase of wind speed, occurrence frequency of acid rain was more and more small. When the wind direction was northeast wind and partial southeast wind ,the chance of acid rain was high.