天津市蓟州区2009—2021年酸雨发生特征分析

Analysis on the Occurrence Characteristics of Acid Rain in Jizhou District of Tianjin from 2009 to 2021

为掌握蓟州降水酸碱度及发生规律,从而为开展生态环境治理及降水污染防治提供科学依据。利用2009—2021年蓟州国家气象观测站酸雨观测资料,对该地区酸雨变化特征进行分析。结果表明:近年来蓟州区降水酸度明显降低,酸雨年发生次数和频率有明显下降趋势;各个酸雨等级均呈逐年递减态势,且发生的酸雨多为较弱酸雨等级,8—11月为酸雨多发期,1—2月为酸雨偶发期;降水pH值、K值随降水量级的增大逐渐降低,偏东风对蓟州酸雨发生的贡献率最大。综上所述,蓟州区近年来酸雨发生情况得到明显改善,且降水洁净程度越来越好,大气环境治理成效显著。酸雨发生规律具有季节性,且与降水量和风有密切关系。

In order to master the acidity and alkalinity of precipitation and its occurrence law in Jizhou,so as to provide scientific basis for ecological environment governance and precipitation pollution prevention and control.Based on the observation data of acid rain in Jizhou National Meteorological Observatory from 2009 to 2021,this paper analyzed the change characteristics of acid rain in this area.The results showed that in recent years,the acid rain in Jizhou District had obviously decreased,the annual occurrence times and frequency of acid rain had obviously decreased,and all acid rain grades had been decreased year by year,and acid rain was mostly weak acid rain grade,August-November was the frequent period of acid rain,January-February was the occasional period of acid rain;the pH value and K value of precipitation gradually decreased with the increase of precipitation,the east wind contributed the most to the occurrence of acid rain in Jizhou.To sum up,the occurrence of acid rain in Jizhou has significantly improved in recent years,and precipitation is getting cleaner and cleaner,the effect of atmospheric environment control is remarkable.The occurrence of acid rain is seasonal,and it is closely related to precipitation and wind.