气象科技进展2025，Vol.15Issue(4)：55-60,6.DOI:10.3969/j.issn.2095-1973.2025.04.007
2019年北京市怀柔区降水化学特征分析
Chemical Characteristics of Precipitation in Huairou District,Beijing in 2019
摘要
Abstract
To reveal the current status of acid rain pollution and the chemical composition of precipitation in Huairou District,Beijing,the precipitation data from Huairou District in 2019 were used to analyze the pH value and chemical components of precipitation.The results show that:1)In 2019,the average pH value of precipitation in Huairou District was 5.85,with 4 occurrences of weakly acidic precipitation,which accounted for 9.1%of the total precipitation events.The pH value was highest in spring,followed successively by winter,summer and autumn.The average annual electrical conductivity of precipitation was 39.8 μS/cm,with the value below 50 μS/cm from July to September.2)The key chemical components in precipitation were Ca2+,NH4+,Mg2+,SO42-,NO3-,and Cl-,among which the alkaline ions with strong acid-neutralizing capacity,namely Ca2+,Mg2+,and NH4+,accounted for 30.0%,11.9%,and 58.1%of the neutralization effect,respectively.The average equivalent concentration ratio of[SO42-]/[NO3-]was 5.0,indicating that the precipitation was of the sulfate type or coal combustion type.The average value of[Cl-]/[Na+]was 3.81,suggesting that in addition to being transported from the ocean,Cl-and Na+were also affected by anthropogenic activities.Ca2+and Mg2+were mainly influenced by external sources such as dust storms.High winds were responsible for the high concentration of NH4+in spring.The concentration correlation coefficients between NH4+and SO42-or NO3-were higher than those between Ca2+and SO42-or NO3-,indicating that the neutralization effect of the alkaline cation NH4+on the acidifying anions SO42-and NO3-was greater than that of Ca2+.关键词
怀柔区/降水/酸雨/成因Key words
Huairou District/precipitation/acid rain/cause分类
天文与地球科学引用本文复制引用
单瑞娟,张爱英,宋燕,李雅洁,吴琳,陈倩倩,刘文霞..2019年北京市怀柔区降水化学特征分析[J].气象科技进展,2025,15(4):55-60,6.基金项目
北京市怀柔区科技项目(NY2019-1) （NY2019-1）
