天气形势对四川盆地区域性臭氧污染的影响

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Abstract The features of regional O₃ pollution and its relationship between synoptic patterns in Sichuan Basin during 2014~2019 were quantitatively analyzed based on the ambient measurements, ERA5 reanalysis data as well as the PCT objective classification method. The frequency of regional O₃ pollution in the Sichuan Basin during 2014~2019 showed a unimodal distribution with the highest frequency in 2016. The Chengdu Plain was the most polluted region with elevated O₃ levels in the Sichuan Basin. Among the six classified synoptic patterns, Type1, 2, 6 were classified as polluted synoptic patterns which exhibited a western-eastern pressure gradient. Meanwhile, the Sichuan Basin was controlled by a low-pressure system in these synoptic patterns. In contrast, Type3 and Type4 were identified as clean synoptic patterns. The sea level pressure in Type3 was high over the northern SCB and low over the southern SCB, with a low-pressure center located at the eastern Sichuan Basin. Unlike Type3, the sea level pressure in Type4 was higher in the east and lower in the west, with some small-scale high-pressure centers distributed in the Tibetan Plateau. The high temperature, low cloud coverage, strong solar radiation, and low relative humidity in Sichuan Basin under the polluted synoptic types were beneficial to the O₃ formation. The stagnant conditions in Type1 and the strong regional transport of O₃ and its precursors by the prevailing southeast wind fields in Type 2 and 6 were primary processes that leading to the frequent regional O₃ episodes occurred in polluted synoptic types. In addition, the prediction method based on synoptic pattern classification showed that the contribution of synoptic patterns on the inter-annual variability of O₃ concentration in the Sichuan Basin ranged from 34.8% to 66.3%, with the contribution can even reached more than twice its annual variation of specific city cluster within SCB.

Key words： ozone pollution synoptic pattern Sichuan Basin PCT objective classification method

Received: 22 October 2020

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	Articles by authors
	YANG Xian-yu
	LU Ya-qiong
	WANG Yu-run
	QIAO Yu-hong
	ZHANG Gong-liang
	WANG Shi-gong
	ZHANG Xiao-ling
	LIU Zhi-hong
	LIU Yi-lin
	ZHU Xin-sheng

Cite this article:

YANG Xian-yu,LU Ya-qiong,WANG Yu-run等. Impact of synoptic patterns on regional ozone pollution in Sichuan Basin[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(6): 2526-2539.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I6/2526

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