Open AccessEffect of rainfall intensity on PM10 and PM2.5 scavenging in Guangzhou at night
Author(s) -
Yiming Wang,
Li He
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/450/1/012075
Subject(s) - particulates , environmental science , daytime , atmospheric sciences , intensity (physics) , deposition (geology) , scavenging , climatology , hydrology (agriculture) , geology , structural basin , ecology , paleontology , chemistry , biology , biochemistry , physics , geotechnical engineering , quantum mechanics , antioxidant
The Lingnan area is a region where frequent rainfall occurs in mainland China. In addition to the special occurrence period, the nighttime rainfall has obvious seasonal characteristics, which is different from the climatic boundary conditions during the daytime, and has a great influence on the migration and transformation process of atmospheric pollutants. By counting the observations of atmospheric particulate matter (PM 2.5 , PM 10 ) before and after rainfall in the Pearl River Delta region, the average clearance rate of PM 10 and PM 2.5 for the whole region was 2.36% and 1.41%, and the average clearance rate of night rainfall was calculated. 6.44%, 4.22%. The results show that the rainfall can effectively remove atmospheric particulate pollutants through wet deposition, and the nighttime rainfall is more effective than the daytime rainfall on the atmospheric particulate matter. Through classification discussion, it is found that the greater the rainfall intensity, the longer the rainfall time, the larger the particle size, and the more obvious the advantage of night rain.