青藏高压系统对川渝春夏臭氧污染的影响机制

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Abstract In order to study the mechanism of Qinghai-Tibet high pressure system on spring and summer ozone (O₃) pollution over Sichuan-Chongqing area, the Micaps PLOT High upper-air total factor data, national environmental monitoring station O₃ observation data and meteorological station data of 14 cities from April to September of 2015 to 2018 were analyzed. Results showed that O₃ concentration was closely related to the distribution and quantity of the central position of Qinghai-Tibet high pressure system. The denser the high-pressure center, the more extreme areas and the number of centers, the higher the surface temperature and O₃ concentration in the same period. Especially the frequency of the center appeared around 100°E and 28°N, the surface temperature was higher, led to the emergence of more extreme high concentration of O₃. Compared and analyzing the influence of the north-south migration of the high-pressure ridge on O₃ concentration during different years and months, it was found that the northward migration of high-pressure ridge leaded to longer sunshine duration and higher O₃ concentration. The combined effects of high-pressure center and ridge line on O₃ over Sichuan-Chongqing area were analyzed as well, which showed that high-pressure center and high-pressure ridge affect the O₃ concentration mainly by controlling the surface temperature and sunshine duration, respectively. At the same time, the effect and degree of the two effects on O₃ concentration were also different (i.e., sometimes the increase of O₃ concentration showed synergistic effect, while sometimes antagonistic effect).

Key words： Qinghai-Tibet high pressure Sichuan-Chongqing urban agglomeration ozone concentration meteorological factors number of centers ridge of high pressure

Received: 20 August 2020

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X511

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	LIU Wei
	KANG Ping
	ZHANG Xiao-ling
	XIANG Wei-guo
	LIU Zhi-hong
	ZHANG Xu-tao
	LI Chun-kai
	SONG Rong-jin
	LEI Yu

Cite this article:

LIU Wei,KANG Ping,ZHANG Xiao-ling等. Mechanism of Qinghai-Tibet high pressure system on spring and summer ozone pollution over Sichuan-Chongqing area[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(4): 1511-1520.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I4/1511

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