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Sci Total Environ

Title:		"Photochemistry of ozone pollution in autumn in Pearl River Estuary, South China"
Author(s):		Liu X; Wang N; Lyu X; Zeren Y; Jiang F; Wang X; Zou S; Ling Z; Guo H;
Address:		"Department of Civil and Environmental Engineering, Hong Kong Polytechnic University, Hong Kong, China. Institute of Tropical and Marine Meteorology/Guangdong Provincial Key Laboratory of Regional Numerical Weather Prediction, China Meteorological Administration, Guangzhou, China. Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, International Institute for Earth System Science, Nanjing University, Nanjing, China. Guangzhou Institute of Geochemistry, Chines Academy of Sciences, Guangzhou, China. School of Marine Sciences, Sun Yat-sen University, Zhuhai, China. School of Atmospheric Sciences, Sun Yat-sen University, Zhuhai, China. Department of Civil and Environmental Engineering, Hong Kong Polytechnic University, Hong Kong, China. Electronic address: ceguohai@polyu.edu.hk"
Journal Title:		Sci Total Environ
Year:		2021
Volume:		20200822
Issue:
Page Number:		141812 -
DOI:		10.1016/j.scitotenv.2020.141812
ISSN/ISBN:		1879-1026 (Electronic) 0048-9697 (Linking)
Abstract:		"To explore the photochemical O(3) pollution over the Pearl River Estuary (PRE), intensive measurements of O(3) and its precursors, including trace gases and volatile organic compounds (VOCs), were simultaneously conducted at a suburban site on the east bank of PRE (Tung Chung, TC) in Hong Kong and a rural site on the west bank (Qi'ao, QA) in Zhuhai, Guangdong in autumn 2016. Throughout the sampling period, 3 days with high O(3) levels (maximum hourly O(3) > 100 ppbv) were captured at both sites (pattern 1) and 13 days with O(3) episodes occurred only at QA (pattern 2). It was found that O(3) formation at TC was VOC-limited in both patterns because of the large local NO(x) emissions. However, the O(3) formation at QA was co-limited by VOCs and NO(x) in pattern 1, but VOC-limited in pattern 2. In both patterns, isoprene, formaldehyde, xylenes and trimethylbenzenes were the top 4 VOCs that modulated local O(3) formation at QA, while they were isoprene, formaldehyde, xylenes and toluene at TC. In pattern 1, the net O(3) production rate at QA (13.1 +/- 1.6 ppbv h(-1)) was high, and comparable (p = 0.40) to that at TC (12.1 +/- 1.5 ppbv h(-1)), so was the hydroxyl radical (i.e., OH), implying high atmospheric oxidative capacity over PRE. In contrast, the net O(3) production rate was significantly higher (p < 0.05) at QA (16.3 +/- 0.4 ppbv h(-1)) than that at TC (4.7 +/- 0.2 ppbv h(-1)) in pattern 2, and the OH concentration and cycling rate were also higher, indicating much stronger photochemical reactions at QA. These findings enhanced our understanding of O(3) photochemistry in the Pearl River estuary, which could be extended to other estuaries"
Keywords:		Ozone photochemistry Ozone pollution Pbm-mcm Pearl River Estuary VOCs;
Notes:		"PubMed-not-MEDLINELiu, Xufei Wang, Nan Lyu, Xiaopu Zeren, Yangzong Jiang, Fei Wang, Xinming Zou, Shichun Ling, Zhenhao Guo, Hai eng Netherlands 2020/09/10 Sci Total Environ. 2021 Feb 1; 754:141812. doi: 10.1016/j.scitotenv.2020.141812. Epub 2020 Aug 22"