Li Fangjie, Tong Shengrui, Jia Chenhui, Zhang Xinran, Lin Deng, Zhang Wenqian, Li Weiran, Wang Lili, Ge Maofa, Xia Lixin
College of Chemistry, Liaoning University, Shenyang 110036, China; State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
J Environ Sci (China). 2022 Apr;114:85-97. doi: 10.1016/j.jes.2021.08.008. Epub 2022 Jan 16.
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 (L). 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 (O) formation in an O episode. The simulation results indicated that reducing NMHCs concentration could effectively suppress O formation. Moreover, reducing traffic-related emissions of NMHCs was an effective way to control O pollution at an urban site in Beijing.
2020年9月1日至10月20日秋季期间，在北京海淀区对54种非甲烷碳氢化合物（NMHCs）进行了实地观测。在此期间，总NMHCs的平均浓度为29.81±11.39 ppbv，烷烃是主要成分。国庆期间NMHCs存在典型的节日效应，浓度较低。烯烃和芳烃在臭氧生成潜势（OFP）和OH自由基损失率（L）方面是主要类别。正矩阵因子分解（PMF）运行结果表明，机动车尾气成为城市地区最大的来源，其次是液化石油气（LPG）使用、溶剂使用和燃料蒸发。将箱式模型与主化学机制（MCM）相结合，研究了不同NMHCs源对一次臭氧（O）污染事件中臭氧生成的影响。模拟结果表明，降低NMHCs浓度可有效抑制臭氧生成。此外，减少与交通相关的NMHCs排放是控制北京城市站点臭氧污染的有效途径。
