珠三角冬季臭氧污染成因分析——以2020年1月一次污染过程为例

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Abstract This study was to analyze effects of precursors, atmospheric oxidative capacity (AOC) and free radicals on an ozone pollution episode in January 2020 in the Pearl River Delta (PRD). Our observations show that low wind speed during the pollution period was in favor of the accumulation of pollutants; while the daytime radiation could reach 70% of the summer in the same year, providing strong photochemical processes for ozone formation. The concentrations of ozone and its precursors increased significantly in the early stage of pollution, and accumulated with the pollution process. Simulations from the observation-based model (OBM) demonstrated that the formation and destruction rates of OH and HO₂ in the pollution day were much higher than in other periods, indicating higher rates of free radical circulation and AOC. During the observation period, the AOC was mainly attributed to the oxidation of OH and ozone during the daytime. The maximum AOC was 4.9×10⁷ molecule/(cm³·s) in the polluted day, indicating that the oxidation processes through photochemical reactions in winter in the PRD was still effective, thereby promoting the massive production of secondary pollutants. During the pollution period, the main contributors to OH reactivity during the day were volatile organic compounds (VOCs, 47%) and NO_x (37%), or the pollution process was affected by both traffic and industrial emissions. Obviously, the increase of VOCs was the main factor of ozone pollution in this pollution process; and to extend the control of VOCs to cold seasons can help mitigate ozone pollution in these seasons in the PRD.

Key words： ozone atmospheric oxidation capacity OH reactivity O₃-NO_x-VOC sensitivity the Pearl River Delta wintertime

Received: 27 September 2022

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X513

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	Articles by authors
	ZHOU Jie-ping
	YUAN Bin
	PENG Yu-wen
	YANG Su-xia
	LI Jin
	LIU Si-li
	HUANG Shan
	LI Xiao-bing
	CAI Jia-hua
	SHAO Min

Cite this article:

ZHOU Jie-ping,YUAN Bin,PENG Yu-wen等. Causes of ozone pollution in the Pearl River Delta in Winter-A case study of pollution process in January 2020[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(5): 2198-2209.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I5/2198

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