重庆市O<sub>3</sub>污染日的大气环流分型与传输特征

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Abstract The pollution of tropospheric ozone has become an emerging issue in the urban areas of Chongqing. From 2015 to 2019, the near-surface ozone concentrations have elevated with increasing days of exceeding the national air quality standard (NAQS). The comprehensive analysis using meteorological data showed that high ozone concentration frequently appeared when the daily maximum temperature over 35℃ as well as relative humidity below 70%. T-mode principal component analysis (PCT) was applied to synoptic classification. The result demonstrated that the occurrence of ozone pollution in Chongqing was mostly related correlated to three typical weather patterns, such as patterns of the northwest to low (T1), low low-pressure rear type (T4) and west to high (T3), and the corresponding ratio of days of ozone exceeding the NAQS were 34.6%, 17.0%, and 14.2% respectively. The result of HYSPLIT4 indicated air masses during days of ozone exceeding NAQS were mainly short and moderate distance from the north, northeast, south, and west directions. It is worth mentioning that the south areas of urban Chongqing have become more and more important potential source regions of ozone from 2015 to 2019, according to the Potential Source Contribution Function (PSCF) distribution. In addition, PSCF results were highly consistent with the spatial distribution of NOx and VOCs emissions in Chongqing.

Key words： ozone pollution synoptic patterns backward trajectory potential source area contribution

Received: 08 June 2020

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X511

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	Articles by authors
	PU Xi
	LI Zhen-liang
	ZHANG Yue
	GAO Yang-hua
	LV Ping-jiang
	ZHANG Wei-dong
	ZHAI Chong-zhi

Cite this article:

PU Xi,LI Zhen-liang,ZHANG Yue等. Characterization of atmospheric circulation and transmission in Chongqing City during ozone polluted days[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(1): 18-27.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I1/18

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