南亚高压对四川盆地夏季区域持续性O<sub>3</sub>污染的影响

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Abstract Based on the monitoring data of ozone (O₃) concentration in Sichuan Basin from 2015 to 2020, a database of O₃ regional persistent pollution cases was constructed and further spatio-temporally matched with high and low altitude meteorological observation data. The effect of the South Asian High Pressure system (SAH) on the surface meteorological elements and O₃ pollution generation in Sichuan Basin during summer was investigated by applied this database. The O₃ regional persistent pollution (ORPP) in Sichuan Basin became worse from 2015 to 2018, while the pollution trend remained relatively stable from 2018 to 2020. And ORPP was mainly concentrated in spring and summer season. The situation of O₃ pollution was most severe in central-south part of the basin (especially in Chengdu, Chongqing, Luzhou), and the high value area gradually shifted to the north-south direction. (2) The mechanism of ORPP generation was explained based on the influence of SAH (system presence rate, center dispersion and east-west oscillation) on surface meteorological elements:When the mean value of system presence rate was low and the location was eastward, the average temperature, daily temperature difference and sunshine duration were high and the relative humidity was low, which was favorable for O₃ generation. When the eastern mode of SAH centers were significantly concentrated, the daily temperature difference and sunshine duration increased dramatically, which was tended to cause abnormally high O₃ concentrations; When the western mode of SAH oscillated dramatically, the change of daily temperature difference, sunshine duration and relative humidity could cause large fluctuations in O₃ concentrations. (3) Compared the clean period with the polluted period, the system presence rate, center dispersion and east-west oscillation of SAH had a combined effect on the clean period, while the polluted period was mainly influenced by the center dispersion and east-west oscillation. The regional persistent secondary pollution processes (ORPP₂) were prone to occur in Sichuan Basin, when the severe oscillation of western mode and the significant accumulation of eastern mode occurred simultaneously.

Key words： ozone (O₃) South Asian High pressure Sichuan Basin regional persistent pollution

Received: 24 May 2022

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	KANG Ping
	ZHANG Zi-huan
	WANG Tian-qi
	ZHANG Xiao-ling
	LIU Wei
	LEI Yu

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KANG Ping,ZHANG Zi-huan,WANG Tian-qi等. Effects of South Asian High Pressure on regional persistent ozone pollution in Sichuan Basin during summer[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(12): 5484-5496.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I12/5484

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