Sources of ambient non-methane hydrocarbon compounds and their impacts on O3 formation during autumn, Beijing |
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| Authors: | Fangjie Li Shengrui Tong Chenhui Ji Xinran Zhang Deng Lin Wenqian Zhang Weiran Li Lili Wang Maofa Ge Lixin Xia |
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| Institution: | 1. College of Chemistry, Liaoning University, Shenyang 110036, China;2. State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China;3. Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China;4. University of Chinese Academy of Sciences, Beijing 100049, China;5. Key Laboratory of Oasis Ecology, College of Resource and Environment Sciences, Xinjiang University, Urumqi 830046, China;6. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics (IAP), Chinese Academy of Sciences, Beijing 100029, China;7. Department of Chemical and Environmental Engineering, Yingkou Institute of Technology, Yingkou 115014, China |
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| Abstract: | The field observation of 54 non-methane hydrocarbon compounds (NMHCs) was conducted from September 1 to October 20 in 2020 during autumn in Haidian District, Beijing. The mean concentration of total NMHCs was 29.81 ± 11.39 ppbv during this period, and alkanes were the major components. There were typical festival effects of NMHCs with lower concentration during the National Day. Alkenes and aromatics were the dominant groups in ozone formation potential (OFP) and OH radical loss rate (LOH). The positive matrix factorization (PMF) running results revealed that vehicular exhaust became the biggest source in urban areas, followed by liquefied petroleum gas (LPG) usage, solvent usage, and fuel evaporation. The box model coupled with master chemical mechanism (MCM) was applied to study the impacts of different NMHCs sources on ozone (O3) formation in an O3 episode. The simulation results indicated that reducing NMHCs concentration could effectively suppress O3 formation. Moreover, reducing traffic-related emissions of NMHCs was an effective way to control O3 pollution at an urban site in Beijing. |
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| Keywords: | Corresponding authors Non-methane hydrocarbon compounds Festival effects Ozone Source apportionment Master chemical mechanism |
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