Removal Effect of Precipitation on Atmospheric Particulate Matter (PM2.5) in Bengbu City
刊名 Meteorological and Environmental Research
作者 Lei TIAN*, Lei SHAN, Jingyang CHEN
作者单位 Bengbu Meteorological Bureau, Bengbu 233000, Anhui
DOI 10.19547/j.issn2152-3940.2024.01.003
年份 2024
刊期 1
页码 12-15,26
关键词 Precipitation; PM2.5; Removal efficiency; Bengbu
摘要 Based on the monitoring data of PM2.5 concentration in Bengbu Environmental Monitoring Station and precipitation observation data of Bengbu National Meteorological Observation Station from 2016 to 2019, the influence of precipitation on PM2.5 mass concentration in Bengbu City was analyzed. The results show that precipitation had a washing and removal effect on PM2.5 in the air, and the removal effect was related to precipitation level, precipitation intensity, precipitation duration and PM2.5 concentration. The removal effect of precipitation on PM2.5 increased with the increase of precipitation level, and the seasonal difference was obvious. Precipitation intensity was positively correlated with the removal effect of PM2.5, but the average removal rate began to decline when precipitation intensity exceeded 10 mm. With the increase of precipitation intensity, the proportion of positive removal showed an overall upward trend, but there was a low-value area as precipitation intensity was 3-10 mm. Precipitation duration was also positively correlated with the removal effect of PM2.5, and there was a low-value area when precipitation duration was 10-15 h. When PM2.5 concentration was low before the precipitation process began, the removal effect was not good, and the average removal rate was negative. When PM2.5 concentration was high before the precipitation process started, the removal effect was obvious.