| Title: | "Identifying the O(3) chemical regime inferred from the weekly pattern of atmospheric O(3), CO, NO(x), and PM(10): Five-year observations at a center urban site in Shanghai, China" |
| Author(s): | Zhang G; Sun Y; Xu W; Wu L; Duan Y; Liang L; Li Y; |
| Address: | "State Key Laboratory of Severe Weather & Key Laboratory of Atmospheric Chemistry of China Meteorological Administration (CMA), Chinese Academy of Meteorological Sciences (CAMS), Beijing 100081, China. Electronic address: zhanggen@cma.gov.cn. State Key Laboratory of Severe Weather & Key Laboratory of Atmospheric Chemistry of China Meteorological Administration (CMA), Chinese Academy of Meteorological Sciences (CAMS), Beijing 100081, China. State Key Laboratory of Severe Weather & Key Laboratory of Atmospheric Chemistry of China Meteorological Administration (CMA), Chinese Academy of Meteorological Sciences (CAMS), Beijing 100081, China. Electronic address: wuly@cma.gov.cn. Shanghai Environmental Monitoring Center, Shanghai 200233, China. Yangzhou Meteorological Bureau, Yangzhou 225009, China" |
| DOI: | 10.1016/j.scitotenv.2023.164079 |
| ISSN/ISBN: | 1879-1026 (Electronic) 0048-9697 (Linking) |
| Abstract: | "Ozone pollution is still considered a severe environmental problem in China despite the fact that great efforts have been devoted to monitoring and alleviating its impact by the Chinese government including the establishment of numerous observational networks. One of the issues most relevant to the design of emission reduction policies is to distinguish the O(3) chemical regime. Here a method of quantifying the fraction of the radical loss versus NO(x) chemistry was applied to identify the O(3) chemical regime inferred from the weekly pattern of atmospheric O(3), CO, NO(x), and PM(10), which were monitored by Ministry of Ecology and Environment of China (MEEC). During spring and autumn, O(3) and the total odd oxygen (O(x), O(x) = O(3) + NO(2)) weekend afternoon concentrations are both higher than the weekday values during 2015-2019 except in 2016, while CO and NO(x) weekend morning concentrations were generally both smaller than weekday values except 2017. Results from the calculated values of fraction of the radical loss by NO(x) chemistry relative to total radical loss (L(n)/Q) suggested a volatile organic compound (VOC)-limited regime at this site in the spring of 2015-2019, as expected from the decreasing trend in NO(x) concentration and essentially constant CO after 2017. With respect to autumn, a shift from a transition regime during 2015-2017 to a VOC-limited regime in 2018 was found, which rapidly took place to a NO(x)-limited regime in 2019. No significant differences were detected in the L(n)/Q values under different assumptions on photolysis frequencies both in spring and autumn mostly from 2015 to 2019, giving the same conclusion of determining the O(3) sensitivity regime. This study develops a new method in determining the O(3) sensitivity regime in the typical season in China and provides insight into efficient O(3) control strategies in different seasons" |
| Keywords: | Nitrogen oxides Ozone Sensitivity regime Yangtze River Delta; |
| Notes: | "PubMed-not-MEDLINEZhang, Gen Sun, Yifeng Xu, Wanyun Wu, Lingyan Duan, Yuseng Liang, Linlin Li, Yuan eng Netherlands 2023/05/19 Sci Total Environ. 2023 Aug 25; 888:164079. doi: 10.1016/j.scitotenv.2023.164079. Epub 2023 May 17" |
