Based on the monitoring data of acid rain obtained from four meteorological stations including Shaowu, Fuzhou,Yong′an,and Xiamen of Fujian province from 2007 to 2014,the temporal-spatial characteristics of acid rain in different regions and the variation of strong acid rain were analyzed,and the causes of acid rain formation were preliminarily explored.The results show that the annual mean pH in precipitation is between 4.64 and 4.97, which belongs to moderate acid rain.The pH value has an increasing trend,and the acidity in precipitation as well as the occurrence frequency of strong acid rain both show a decreasing trend.Acid rain occurs frequently in Sha-owu and Fuzhou,and the strongest acidity in precipitation and the high occurrence frequency of acid rain as well as strong acid rain all appear in Shaowu.However,the acidity of precipitation is weaker and the strong acid rain oc-currence frequency is lower in the two regions after 20 1 1 .Xiamen and Yong′an belong to the regions with weak acid rain,and strong acid rain rarely occurs in Yong′an during a whole year.However,the acidity in precipitation at these two regions increases after 2012,due to the increasing occurrence frequency of acid rain and the increasing cumulative amount of acid rain.Acid rain shows a certain regular monthly variation in Fuzhou,Xiamen,and Sha-owu;acid rain pollution is heavy in winter and spring,but relatively weak in summer.However,such monthly acid rain changes oppositely in Yong′an,with an alkaline precipitation in autumn and winter,and weak acid rain pollu-tion in spring.The probability of monthly mean precipitation pH less than 4.50 in Fujian province from 2007 to 2014 is 0.0%in Yong′an,4.2%in Xiamen,29.2%in Fuzhou,and 42.7%in Shaowu,respectively,and all show a decreasing trend.The regional acid rain pollution in Fujian province is caused by the emissions of urban acid pol-lutants,inter-provincial transport of acid substances,geographical environment,and weather conditions.
国家科技期刊平台
NSTL
维普
万方数据
