| Title: | Atmospheric oxidizing capacity in autumn Beijing: Analysis of the O(3) and PM(2.5) episodes based on observation-based model |
| Author(s): | Jia C; Tong S; Zhang X; Li F; Zhang W; Li W; Wang Z; Zhang G; Tang G; Liu Z; Ge M; |
| Address: | "State Key Laboratory for Structural Chemistry of Unstable and Stable Species, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China. State Key Laboratory for Structural Chemistry of Unstable and Stable Species, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China. Electronic address: tongsr@iccas.ac.cn. State Key Laboratory for Structural Chemistry of Unstable and Stable Species, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China; University of Chinese Academy of Sciences, Beijing 100049, China. State Key Laboratory for Structural Chemistry of Unstable and Stable Species, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China; College of Chemistry, Liaoning University, Shenyang 110036, China. State Key Laboratory of Severe Weather & Key Laboratory for Atmospheric Chemistry of CMA, Institute of Atmospheric Composition, Chinese Academy of Meteorological Sciences, Beijing 100081, China. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China. State Key Laboratory for Structural Chemistry of Unstable and Stable Species, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China; University of Chinese Academy of Sciences, Beijing 100049, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China" |
| DOI: | 10.1016/j.jes.2021.11.020 |
| ISSN/ISBN: | 1001-0742 (Print) 1001-0742 (Linking) |
| Abstract: | "Atmospheric oxidizing capacity (AOC) is the fundamental driving factors of chemistry process (e.g., the formation of ozone (O(3)) and secondary organic aerosols (SOA)) in the troposphere. However, accurate quantification of AOC still remains uncertainty. In this study, a comprehensive field campaign was conducted during autumn 2019 in downtown of Beijing, where O(3) and PM(2.5) episodes had been experienced successively. The observation-based model (OBM) is used to quantify the AOC at O(3) and PM(2.5) episodes. The strong intensity of AOC is found at O(3) and PM(2.5) episodes, and hydroxyl radical (OH) is the dominating daytime oxidant for both episodes. The photolysis of O(3) is main source of OH at O(3) episode; the photolysis of nitrous acid (HONO) and formaldehyde (HCHO) plays important role in OH formation at PM(2.5) episode. The radicals loss routines vary according to precursor pollutants, resulting in different types of air pollution. O(3) budgets and sensitivity analysis indicates that O(3) production is transition regime (both VOC and NO(x)-limited) at O(3) episode. The heterogeneous reaction of hydroperoxy radicals (HO(2)) on aerosol surfaces has significant influence on OH and O(3) production rates. The HO(2) uptake coefficient (gammaHO(2)) is the determining factor and required accurate measurement in real atmospheric environment. Our findings could provide the important bases for coordinated control of PM(2.5) and O(3) pollution" |
| Keywords: | Aerosols/analysis *Air Pollutants/analysis Beijing China Environmental Monitoring Formaldehyde Hydroxyl Radical/analysis Nitrous Acid Oxidants Oxidation-Reduction *Ozone/analysis Particulate Matter/analysis *Volatile Organic Compounds/analysis Atmospheric; |
| Notes: | "MedlineJia, Chenhui Tong, Shengrui Zhang, Xinran Li, Fangjie Zhang, Wenqian Li, Weiran Wang, Zhen Zhang, Gen Tang, Guiqian Liu, Zirui Ge, Maofa eng Netherlands 2022/10/02 J Environ Sci (China). 2023 Feb; 124:557-569. doi: 10.1016/j.jes.2021.11.020. Epub 2022 Feb 23" |
