Causes of ozone pollution in the Pearl River Delta in Winter-A case study of pollution process in January 2020
ZHOU Jie-ping1,2, YUAN Bin1,2, PENG Yu-wen1,2, YANG Su-xia1,2, LI Jin1,2, LIU Si-li1,2, HUANG Shan1,2, LI Xiao-bing1,2, CAI Jia-hua1,2, SHAO Min1,2
1. Institute for Environmental and Climate Research, Jinan University, Guangzhou 511443, China; 2. Guangdong- Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Guangzhou 511443, China
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 NOx (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.
周婕萍, 袁斌, 彭钰雯, 杨素霞, 李瑾, 刘思利, 黄山, 李小兵, 蔡嘉骅, 邵敏. 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[J]. 中国环境科学, 2023, 43(5): 2198-2209.
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. Causes of ozone pollution in the Pearl River Delta in Winter-A case study of pollution process in January 2020. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(5): 2198-2209.
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