| Title: | Chemical drivers of ozone change in extreme temperatures in eastern China |
| Author(s): | Meng X; Jiang J; Chen T; Zhang Z; Lu B; Liu C; Xue L; Chen J; Herrmann H; Li X; |
| Address: | "Department of Environmental Science & Engineering, Fudan University, Shanghai, China. Environmental Research Institute, Shandong University, Shandong, China. Leibniz-Institut fur Tropospharenforschung (IfT), Permoserstr. 15, Leipzig, Germany. Department of Environmental Science & Engineering, Fudan University, Shanghai, China. Electronic address: lixiang@fudan.edu.cn" |
| DOI: | 10.1016/j.scitotenv.2023.162424 |
| ISSN/ISBN: | 1879-1026 (Electronic) 0048-9697 (Linking) |
| Abstract: | "Surface ozone pollution has become the biggest issue in China's air pollution since particulate matters have been improved in the atmosphere. Compared with normal winter/summer, extremely cold/hot weather sustained several days and nights by unfavorable meteorology is more impactful in this regard. However, ozone changes in extreme temperatures and their driving processes remain rarely understood. Here, we combine comprehensive observational data analysis and 0-D box models to quantify the contributions of different chemical processes and precursors to ozone change in these unique environments. Analyses of radical cycling indicate that temperature accelerates OH-HO(2)-RO(2), optimizing ozone production efficiency in higher temperatures. The HO(2) + NO --> OH + NO(2) reaction was the most influenced by temperature change, followed by OH + VOCs --> HO(2)/RO(2). Although most reactions in ozone formation increased with temperature, the increase in ozone production rates was greater than the rate of ozone loss, leading to a fast net ozone accumulation in heat waves. Our results also show that the ozone sensitivity regime is VOC-limited in extreme temperatures, highlighting the significance of volatile organic compound (VOC) control (particularly the control of alkenes and aromatics). In the context of global warming and climate change, this study helps us deeply understand ozone formation in extreme environments and design abatement policies for ozone pollution in such conditions" |
| Keywords: | Extreme temperatures Ozone Photochemical box model Pollution mitigation Radical cycling; |
| Notes: | "PubMed-not-MEDLINEMeng, Xue Jiang, Jiakui Chen, Tianshu Zhang, Zekun Lu, Bingqing Liu, Chao Xue, Likun Chen, Jianmin Herrmann, Hartmut Li, Xiang eng Netherlands 2023/03/04 Sci Total Environ. 2023 May 20; 874:162424. doi: 10.1016/j.scitotenv.2023.162424. Epub 2023 Mar 1" |
