| Title: | "Understanding the nocturnal ozone increase in Nanjing, China: Insights from observations and numerical simulations" |
| Author(s): | Wang K; Xie F; Sulaymon ID; Gong K; Li N; Li J; Hu J; |
| Address: | "Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, 219 Ningliu Road, Nanjing 210044, China. Nanjing Municipal Academy of Ecological and Environment Protection Science, Nanjing 210093, China. Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, 219 Ningliu Road, Nanjing 210044, China. Electronic address: jianlinhu@nuist.edu.cn" |
| DOI: | 10.1016/j.scitotenv.2022.160211 |
| ISSN/ISBN: | 1879-1026 (Electronic) 0048-9697 (Linking) |
| Abstract: | "Surface ozone (O(3)) is mainly photochemically formed by nitrogen oxides (NO(X)) and volatile organic compounds (VOCs), and therefore O(3) usually has a distinct diurnal variation with high concentrations in the afternoon and low values at night. However, eight nocturnal O(3) increase (NOI) events were identified in Nanjing in June 2021. To understand the mechanism of NOI events, we selected two events (June 6-7, and 24-25) for observational data analysis. The Community Multiscale Air Quality (CMAQ) model was employed for the process analysis (PA) and regional transport of O(3). By analyzing the O(3) observation data and meteorological factors, we found that there were clear southeastward O(3) transport paths. The O(3) peak clearly moved from the upwind to the downwind cities in both events. Model simulations showed that when nocturnal O(3) enhancement occurred, horizontal transport resulted in a negative to positive net O(3) production rate. O(3) continued to get accumulated in Nanjing. Nocturnal O(3) in the first event was dominated by long-range transport, with the top two contributing cities being Huzhou (5.6 %) and Jiaxing (4.7 %). NOI during the second event was from the nearby upwind cities. The top three contributing cities were Shanghai (18.3 %), Wuxi (9.1 %), and Suzhou (8.8 %). We conclude that the June NOI events in Nanjing were mainly driven by the horizontal transport of southeasterly winds. This study provides scientific support for O(3) prevention and control in Nanjing in the summer" |
| Keywords: | *Ozone/analysis *Air Pollutants/analysis Environmental Monitoring/methods China *Air Pollution/analysis *Volatile Organic Compounds/analysis Horizontal transport Nocturnal O(3) increase Process analysis Upwind; |
| Notes: | "MedlineWang, Kang Xie, Fangjian Sulaymon, Ishaq Dimeji Gong, Kangjia Li, Nan Li, Jingyi Hu, Jianlin eng Netherlands 2022/11/22 Sci Total Environ. 2023 Feb 10; 859(Pt 2):160211. doi: 10.1016/j.scitotenv.2022.160211. Epub 2022 Nov 21" |
