降水和风对泰安地区PM2.5浓度的影响及区域传输研究

doi:10.3969/j.issn.1673-503X.2021.03.005

Abstract

Abstract:

Using the hourly observation data of precipitation, wind, and PM_2.5 in Tai'an from 2018 to 2019, the impacts of precipitation and wind on PM_2.5 concentration as well as the source of PM_2.5 were analyzed.The results showed that precipitation has a certain scavenging effect on PM_2.5.The average mass concentration of PM_2.5 on rainy days is about 7.2% lower than that on non-rainy days, especially in autumn and winter.The scavenging rate of PM_2.5 by precipitation is related to precipitation intensity, initial PM_2.5 concentration before precipitation, and precipitation duration.The scavenging rate of PM_2.5 is higher than 40% when the precipitation intensity is greater than 4 mm·h^-1.The PM_2.5 concentration tends to rebound under conditions of precipitation intensity < 2 mm·h^-1, or the initial PM_2.5 concentration < 75 μg·m^-3 and precipitation intensity < 1 mm·h^-1, or the initial PM_2.5 concentration within the range of 75-100 μg·m^-3 and precipitation duration < 5 h.Different wind directions and wind speeds show different impacts on the scavenging of haze particles in Tai'an.The west-southwesterly wind and the east-northeasterly wind are more likely to cause haze pollution in the Tai'an area.During heavy pollution, the southerly winds > 5 m·s^-1 and the northerly winds > 3 m·s^-1 can effectively remove pollutants.PM_2.5 is mainly transported from Guangxi-Hu'nan-Jiangxi provinces, southern Anhui province, and northern Zhejiang province to Tai'an by southwesterly airflows, and less contribution is from the local emissions.

Key words: PM_2.5, Precipitation, Wind, Scavenging rate, Emission source

CLC Number:

X513

Zhao-peng LUAN,Hui-chao LU,Tian LI,Xiang-qian CUI,Tian-liang ZHAO,Qing-rui ZHU. Impacts of precipitation and wind on PM_2.5 concentration and its region transport in Tai'an[J]. Journal of Meteorology and Environment, 2021, 37(3): 33-39.

Figures/Tables 8

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Impacts of precipitation and wind on PM_2.5 concentration and its region transport in Tai'an

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Impacts of precipitation and wind on PM2.5 concentration and its region transport in Tai'an

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Impacts of precipitation and wind on PM_2.5 concentration and its region transport in Tai'an