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Secondary Organic Aerosol Formation of Fleet Vehicle Emissions in China: Potential Seasonality of Spatial Distributions

机译：中国舰队车辆排放的二次有机气溶胶形成：空间分布的潜在季节性

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摘要

Vehicle emissions are an important source of urban particular matter. To investigate the secondary organic aerosol (SOA) formation potential of real-world vehicle emissions, we exposed on-road air in Beijing to hydroxyl radicals generated in an oxidation flow reactor (OFR) under high-NO_x conditions onboard a mobile laboratory and characterized SOA and their precursors with a suite of state-of-the-art instrumentation. The OFR produced 10-170 μg m~(-3) of SOA with a maximum SOA formation potential of 39-50 μg m~(-3) ppmv~(-1) CO that occurred following an integrated OH exposure of (1.3-2.0) × 10 molecules cm~(-3) s. The results indicate relatively shorter photochemical ages for maximum SOA production than previous OFR results obtained under low-NO_x conditions. Such timescales represent the balance of functionalization and fragmentation, possibly resulting in different spatial distributions of SOA in different seasons as the oxidant level changes. The detected precursors may explain as much as 13% of the observed SOA with the remaining plausibly contributed by the oxidation of undetected intermediate-volatility organic compounds. Extrapolation of the results suggests an annual SOA production rate of 0.78 Tg yr~(-1) from mobile gasoline sources in China, highlighting the importance of effective regulation of gaseous vehicular precursors to improve air quality in the future.
机译：车辆排放是城市特定事项的重要来源。为了研究现实世界车辆排放的二次有机气溶胶（SOA）形成潜力，我们在移动实验室的高No_X条件下在氧化流量反应器（OFR）中暴露于北京的道路自由基，并在移动实验室的情况下，在移动实验室和表征SOA及其前体带有套件的最先进的仪器。在一体化OH暴露之后产生10-170μgM〜（-3）的SOA，其最大SOA形成电位为39-50μgm〜（-3）ppmv〜（-1）Co（1.3- 2.0）×10分子cm〜（-3）s。结果表明，用于在低NO_X条件下获得的最高SOA产生的光化学年龄相对较短的光化学年龄。这种时间尺度代表了功能化和碎片的平衡，可能导致SOA的不同空间分布在不同季节，因为氧化水平变化。检测到的前体可以用未检测到的中间挥发性有机化合物的氧化贡献，如观察到的SOA的13％。结果推断表明，中国移动汽油源的年度SOA生产率为0.78 TG YR〜（-1），突出了有效调节气态车辆前体的重要性，以提高未来空气质量。

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  • 来源
    《Environmental Science & Technology》 |2021年第11期|7276-7286|共11页
  • 作者

    Keren Liao; Qi Chen; Ying Liu; Yong Jie Li; Andrew T. Lambe; Tong Zhu; Ru-Jin Huang; Yan Zheng; Xi Cheng; Ruqian Miao; Guancong Huang; Reza Bashiri Khuzestani; Tianjiao Jia;

  • 作者单位

    State Key Joint Laboratory of Environmental Simulation and Pollution Control BIC-ESAT and IJRC College of Environmental Sciences and Engineering Peking University Beijing 100871 China;

    State Key Joint Laboratory of Environmental Simulation and Pollution Control BIC-ESAT and IJRC College of Environmental Sciences and Engineering Peking University Beijing 100871 China;

    State Key Joint Laboratory of Environmental Simulation and Pollution Control BIC-ESAT and IJRC College of Environmental Sciences and Engineering Peking University Beijing 100871 China;

    Department of Civil and Environmental Engineering Faculty of Science and Technology University of Macau Taipa Macau 999078 China;

    Aerodyne Research Inc. Billerica Massachusetts 01821 United States;

    State Key Joint Laboratory of Environmental Simulation and Pollution Control BIC-ESAT and IJRC College of Environmental Sciences and Engineering Peking University Beijing 100871 China;

    State Key Laboratory of Loess and Quaternary Geology Center for Excellence in Quaternary Science and Global Change and Key Laboratory of Aerosol Chemistry & Physics Institute of Earth Environment Chinese Academy of Sciences Xi'an 710075 China;

    State Key Joint Laboratory of Environmental Simulation and Pollution Control BIC-ESAT and IJRC College of Environmental Sciences and Engineering Peking University Beijing 100871 China;

    State Key Joint Laboratory of Environmental Simulation and Pollution Control BIC-ESAT and IJRC College of Environmental Sciences and Engineering Peking University Beijing 100871 China;

    State Key Joint Laboratory of Environmental Simulation and Pollution Control BIC-ESAT and IJRC College of Environmental Sciences and Engineering Peking University Beijing 100871 China;

    State Key Joint Laboratory of Environmental Simulation and Pollution Control BIC-ESAT and IJRC College of Environmental Sciences and Engineering Peking University Beijing 100871 China;

    State Key Joint Laboratory of Environmental Simulation and Pollution Control BIC-ESAT and IJRC College of Environmental Sciences and Engineering Peking University Beijing 100871 China;

    State Key Joint Laboratory of Environmental Simulation and Pollution Control BIC-ESAT and IJRC College of Environmental Sciences and Engineering Peking University Beijing 100871 China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    mobile laboratory; vehicle emissions; oxidation flow reactor; high NO_x; SOA; spatial distributions;

    机译：移动实验室;车辆排放;氧化流量反应器;高NO_X;SOA;空间分布;

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