Effects of Rainfall on PM2.5 and PM10 in the Middle Reaches of the Yangtze River

被引:31
作者
Zhou, Yue [1 ]
Yue, Yanyu [2 ]
Bai, Yongqing [3 ]
Zhang, Liwen [1 ]
机构
[1] Wuhan Reg Climate Ctr, Wuhan 430074, Peoples R China
[2] Wuhan Cent Meteorol Observ, Wuhan 430074, Peoples R China
[3] China Meteorol Adm, Inst Heavy Rain, Hubei Key Lab Heavy Rain Monitoring & Warning Res, Wuhan 430205, Peoples R China
基金
中国国家自然科学基金;
关键词
PARTICULATE MATTER; AEROSOL-PARTICLES; RAPID FORMATION; NORTHERN CHINA; CLIMATE-CHANGE; AIR-POLLUTION; HAZE EPISODE; WATER DROPS; FOG; PRECIPITATION;
D O I
10.1155/2020/2398146
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
Based on the PM(2.5)and PM(10)mass concentration data obtained from 51 national air quality monitoring stations and the corresponding rainfall intensity data in automatic meteorological stations in Hubei Province from 1 January 2015 to 31 December 2017, the impact of rainfall intensity on PM mass concentrations under relatively different humidity conditions was analyzed. The results showed that light rain occurred most frequently in the pollution process, with Xiangyang being affected for up to 587 h. PM concentration would not change drastically under the effect of precipitation. Mean rainfall intensity responsible for wet growth of PM(10)and PM(2.5)was mainly <0.5 mm/h, while that responsible for wet removal of PM(2.5)was significantly higher (>1.4 mm/h) than that of PM10(>1.0 mm/h). Precipitation was more likely to produce a wet removal effect for a greater initial value of PM mass concentration, and on the contrary, a wet growth effect was more likely, with the threshold of PM(10)mass concentration being 150 mu g/m(3)and that of PM(2.5)mass concentration being 95 mu g/m(3). Wet removal played a leading role in lower humidity (similar to 60%) and greater rainfall intensity, but wet growth played a leading role in higher humidity (similar to 90%) and lower rainfall intensity. As the precipitation level increased (rainfall >= 1.5 mm center dot h(-1)), the wet removal to PM(10)mass concentration was enhanced more obviously. The variations of PM(2.5)had similar distributions to those of PM(10)under the effect of precipitation, but the wet removal effect of precipitation was weakened and the wet growth effect was enhanced.
引用
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页数:10
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