成都市及周边地区严重臭氧污染过程成因分析

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Abstract

Based on the synoptic pattern, ground observation data and WRF-CMAQ model, this study analyzed the characteristics of a sustained O₃ episode in Chengdu and surrounding areas from July 8-15, 2017. And the physical and chemical processes of this episode was quantified. Sensitivity experiments were used to calculate the relative contribution of regional transport and local photochemical reactions on this episode. The results showed that the sustained O₃ episode was mainly caused by the prevailing easterly wind in the Sichuan Basin, which leaded to the O₃ and its precursors in the eastern urban agglomerations being transported to Chengdu and surrounding areas. Unfavorable meteorological conditions, such as high temperature and low wind speed, were favorable for the formation of this O₃ episode. The process analysis indicated that the contribution of the gas phase chemical reaction was a positive source of O₃ in the daytime, and the contribution of the transport process was explosively increased during severe O₃ episode, which leaded to a rapid increase (up to 50μg/(m³·h)) in the net O₃near the ground. In addition, the sensitivity experiments showed that this episode was dominated by regional transport rather than the local photochemical reaction. Before the outbreak of O₃ concentration, high concentrations of O₃ and its precursors were transported along the wind field and accumulated in Chengdu and surrounding areas, resulting in enhanced O₃ formation during daytime.

Key words： ozone CMAQ persistent pollution IPR (integrated process rate)

Received: 21 October 2019

PACS:

X513

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	Articles by authors
	YANG Xian-yu
	YI Jia-jun
	LU Ya-qiong
	LIU Zhi-hong
	WANG Shi-gong
	LU Shi-hua
	ZHANG Xiao-ling
	WU Kai
	WANG Hao-lin

Cite this article:

YANG Xian-yu,YI Jia-jun,LU Ya-qiong等. Characteristics and formation mechanism of a severe O₃ episode in Chengdu and surrounding areas[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(5): 2000-2009.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I5/2000

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