海南区域背景点光化学污染特征及VOCs来源解析

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Abstract The regional background site in Hainan Province is located in the northeastern part of Hainan Province and serves as an important site along the atmospheric transport pathway in tropical regions in China. This study conducted online observations of photochemical pollutants (O₃, PAN) and their precursors VOCs from August to December 2021 at the regional background site. The study analyzed the characteristics and trends of photochemical pollution, the composition of VOCs, ozone formation potential (OFP), and chemical reactivity (L·OH), and utilized PSCF and PMF methods to investigate the sources of VOCs. The results indicated that the concentration levels of ambient air pollutants at the regional background site in Hainan were relatively low. However, when northerly winds prevailed as the dominant wind direction, concentrations of various pollutants increased. O₃ was generated during the day and accumulated at night under the influence of meteorological conditions, leading to photochemical pollution. The average concentration (volume fraction) of photochemical precursor VOCs during the observation period was 7.21×10^-9±4.60×10^-9, with concentrations of various types of VOCs ranked from highest to lowest as alkanes>OVOC>aromatics>alkenes>alkynes. Pollutant concentrations were significantly higher during pollution periods compared to clean periods. Analysis of VOCs reactivity revealed that OVOC and alkenes were the main contributors to photochemical reactions. High-value areas of potential sources of precursors, PAN, and O₃ during pollution periods were mainly distributed in the developed coastal areas from the Pearl River Delta to the southeast of Fujian. According to the results obtained using PMF source analysis model, this regional background site was significantly influenced by anthropogenic sources, with vehicular exhaust emissions (37.8% to 46.2%) being an important contributor to O₃ pollution in Hainan.

Key words： regional background photochemical pollution VOCs reactivity source apportionment

Received: 18 October 2023

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X511

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	LIN You-jing
	YAN Wei-jun
	XU Wen-shuai
	DU Chuan-dong
	WANG Bo-guang
	GONG Dao-cheng
	LI Qin-qin
	SHENG Hui
	MENG Xin-xin

Cite this article:

LIN You-jing,YAN Wei-jun,XU Wen-shuai等. Characteristics of photochemical pollution and sources analysis of atmospheric volatile organic compounds in the regional background station of Hainan[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(5): 2418-2430.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I5/2418

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