Characteristics and formation mechanism of a severe O3 episode in Chengdu and surrounding areas
YANG Xian-yu1, YI Jia-jun1, LU Ya-qiong2, LIU Zhi-hong3, WANG Shi-gong1, LU Shi-hua1, ZHANG Xiao-ling1, WU Kai1, WANG Hao-lin4
1. Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, China;
2. Institute of Mountain Hazards and Environment, Chinese Academic Sciences, Chengdu 610041, China;
3. College of Resource and Environment, Chengdu University of Information Technology, Chengdu 610225, China;
4. Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, School of Atmospheric Sciences, Sun Yat-Sen University, Guangzhou 510275, China
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.
杨显玉, 易家俊, 吕雅琼, 刘志红, 王式功, 吕世华, 张小玲, 吴锴, 王浩霖. 成都市及周边地区严重臭氧污染过程成因分析[J]. 中国环境科学, 2020, 40(5): 2000-2009.
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. Characteristics and formation mechanism of a severe O3 episode in Chengdu and surrounding areas. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(5): 2000-2009.
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