主办单位:中国气象局沈阳大气环境研究所
国际刊号:ISSN 1673-503X
国内刊号:CN 21-1531/P

Journal of Meteorology and Environment ›› 2018, Vol. 34 ›› Issue (3): 58-70.doi: 10.3969/j.issn.1673-503X.2018.03.007

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Analysis of effect of precipitation events on air pollutant concentration

AN Lin-chang1,2,3, ZHANG Heng-de1, LI Kai-fei4   

  1. 1. National Meteorological Center, Beijing 100081, China;
    2. Chinese Academy of Meteorological Sciences, Beijing 100081, China;
    3. University of Chinese Academy of Sciences, Beijing 100049, China;
    4. Nanjing University of Information Science & Technology, Nanjing, 210044, China
  • Received:2017-12-04 Revised:2018-01-25 Online:2018-06-30 Published:2018-06-30

Abstract: Based on the surface observation data obtained from China Meteorological Administration (CMA) and six pollutants concentration obtained from the Ministry of Environmental Protection (MAP) of China from 2014 to 2016,the variation of air pollutant concentrations before and after precipitation was analyzed.The results show that the occurrence frequency of the decrease in six air pollutants concentration after precipitation is about 43%-60%.The decrease in PM10 concentration is most obvious,then in order of PM2.5,O3,SO2 and NO2,and least in CO.Overall,the larger of air pollutant concentrations before precipitation,the more frequently cases with decreasing concentration after precipitation occurs,and the larger the decrease value is.However,when air pollution concentrations are low before precipitation,there are many cases with increasing concentrations after precipitation,taking a proportion about 21%-61%.Because the mean air pollutant concentrations are very high in the Beijing-Tianjin-Hebei region,the decrease in air pollution concentrations is more obvious in this region than in the Yangtze River Delta region and the Pearl River Delta region.For most of the precipitation hours,the larger the hourly precipitation is,the proportion of hours with decreasing concentrations increases,but the decrease value is smaller.The difference is that when the hourly precipitation is larger than 10 mm,the decrease in O3 and SO2 concentrations in the Beijing-Tianjin-Hebei region and in PM10,PM2.5 and SO2 concentrations over the Yangtze River Delta region is smaller than that when hourly precipitation is smaller than 10 mm.The variation of concentrations of NO2 and O3 in the Pearl River Delta region is not sensitive to the hourly precipitation.The effect of precipitation on the scavenging of O3 at a relatively large concentration is very obvious in the Beijing-Tianjin-Hebei region.In the Yangtze River Delta region and the Pearl River Delta region,when CO concentration before precipitation is small,the number of cases with increasing concentration after rainfall is more than that with decreasing concentration.In addition,the effect of rainfall on the removal of SO2 is very obvious.

Key words: Precipitation event, Air pollutant, Air quality, Precipitation intensity

CLC Number: