2019~2021年四川盆地污染天气客观分型及典型污染个例研究

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Abstract In this study, the PCT objective weather classification method was applied to research the sea level pressure field and 700 and 500hPa geopotential height fields in the Sichuan basin from 2019 to 2021, and the relationship between weather conditions and meteorological elements and air pollution was studied with the combination of environmental monitoring data. The results show that:①It is easy to appear PM_2.5 pollution during the winter half-year, when the weather type of the sea level is low pressure field, 700hPa for westerly trough type, 500hPa for flat latitudinal type, and the weather elements are characterized by low temperature and high humidity, low boundary layer height, existence of convergence of wind field. ②It is conducive to O₃ pollution during the summer half-year, when the sea level weather type is low pressure field, 700hPa with the westerly trough type, 500hPa lying at the back of the westerly trough, controlled by northwest airflow, the meteorology conditions with the characteristics of high temperature, low humidity, high boundary layer height, high radiation intensity and low precipitation. ③The formation of polluted weather is related to the coupling effect of high and low altitude weather patterns. The inverse temperature is a good indicator of pollution during the winter half-year, typical PM_2.5 pollution days are accompanied by multi-layer inversion or ground inversion, which limits the vertical diffusion of pollutants. ④The PM_2.5 high concentration area is mainly distributed in the west and south of the Sichuan Basin, and the low value areas are found in the northern part of the Sichuan Basin. The spatial distribution of O₃ concentration is higher in the Chengdu Plain and the southern part of Sichuan Basin,while the lower concentration in the northeastern part of Sichuan.

Key words： Sichuan Basin PM_2.5 O₃ weather classification case study

Received: 11 October 2022

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X51

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	WANG Cong-cong
	ZHANG Xiao-ling
	LU Ning-sheng

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WANG Cong-cong,ZHANG Xiao-ling,LU Ning-sheng. Objective classification of pollution weather and typical pollution cases in Sichuan Basin from 2019 to 2021[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(5): 2182-2197.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I5/2182

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