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Sources of oxygenated volatile organic compounds (OVOCs) in urban atmospheres in North and South China

机译：北方和华南城市大气中含氧挥发性有机化合物（OVOC）的来源

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摘要

Oxygenated volatile organic compounds (OVOCs) are critical precursors of atmospheric ozone (O-3) and secondary organic aerosols (SOA). Although China is experiencing increasing O-3 pollution from north to south, understanding the major sources of OVOCs in this region is still limited due to their active photochemical behaviors. In this study, five critical OVOCs at a northern urban site (Beijing) and a southern urban site (Shenzhen) were monitored in summer using proton transfer reaction-mass spectrometry (PTR-MS). The mean total concentration of VOCs measured in Beijing (39.4 ppb) was much higher than that measured in Shenzhen (16.7 ppb), with methanol and formaldehyde being the most abundant in concentration at both sites. The source apportionment of daytime OVOCs was conducted effectively using a photochemical age-based parameterization method. Biogenic and anthropogenic secondary sources were the main sources of formaldehyde, acetaldehyde, and acetone at both sites, with a total contribution of 46-82%; acetone also had a large regional-scale background contribution (36 -38%); methanol and methyl ethyl ketone (MEK) were mainly derived from anthropogenic primary sources (35-55%) at both sites. In addition, the regional background levels of OVOCs measured in North China were shown to be much higher than those measured in South China. The calculation of the total O-3 formation potential (OFP) of OVOCs highlights the comparable contributions from anthropogenic and biogenic sources in both Beijing and Shenzhen, indicating the important role of biogenic OVOC sources even in polluted environments. Since biogenic sources are already important but uncontrollable, anthropogenic emissions in China need to be restricted even more critically in the future. (C) 2020 Elsevier Ltd. All rights reserved.
机译：氧化挥发性有机化合物（OVOC）是大气臭氧（O-3）和二次有机气溶胶（SOA）的关键前体。虽然中国正在经历从南北到南部的o-3污染，但了解该地区的ovoc的主要来源仍然是有限的，因为它们的活跃的光化学行为仍然有限。在这项研究中，使用质子转移反应质谱（PTR-MS）在夏季监测北部城市网站（北京）和南部城市网站（深圳）的五个关键ovoc。在北京（39.4 ppb）中测量的VOC的平均总浓度远高于深圳（16.7ppb）测量的VOC的总浓度，甲醇和甲醛在两个位点的浓度中最丰富。使用基于光化的年龄的参数化方法有效地进行白天OVOC的源分配。生物和人为二次来源是两种甲醛，乙醛和丙酮的主要来源，总贡献为46-82％;丙酮也有大型区域规模背景贡献（36-38％）;甲醇和甲基乙基酮（MEK）主要来自两个位点的人为原发性源（35-55％）。此外，在华北地区测量的OVOC的区域背景水平被证明远高于南方州衡量的水平。 Ovocs的O-3形成电位（OFP）的计算突出了北京和深圳的人为和生物源的可比贡献，表明即使在污染环境中也是生物ovoc源的重要作用。由于生物来源已经重要但无法控制，中国的人为排放需要在未来更为严重限制。 （c）2020 elestvier有限公司保留所有权利。

著录项

  • 来源
    《Environmental Pollution》 |2020年第6期|114152.1-114152.8|共8页
  • 作者

    Huang Xiao-Feng; Zhang Bin; Xia Shi-Yong; Han Yu; Wang Chuan; Yu Guang-He; Feng Ning;

  • 作者单位

    Peking Univ Sch Environm & Energy Key Lab Urban Habitat Environm Sci & Technol Shenzhen Grad Sch Sci & Technol Pk Shenzhen 518055 Peoples R China;

    Peking Univ Sch Environm & Energy Key Lab Urban Habitat Environm Sci & Technol Shenzhen Grad Sch Sci & Technol Pk Shenzhen 518055 Peoples R China;

    Peking Univ Sch Environm & Energy Key Lab Urban Habitat Environm Sci & Technol Shenzhen Grad Sch Sci & Technol Pk Shenzhen 518055 Peoples R China;

    Peking Univ Sch Environm & Energy Key Lab Urban Habitat Environm Sci & Technol Shenzhen Grad Sch Sci & Technol Pk Shenzhen 518055 Peoples R China;

    Peking Univ Sch Environm & Energy Key Lab Urban Habitat Environm Sci & Technol Shenzhen Grad Sch Sci & Technol Pk Shenzhen 518055 Peoples R China|PKU HKUST Shenzhen Hong Kong Inst Environm Lab Lishui Rd Shenzhen 518057 Peoples R China;

    PKU HKUST Shenzhen Hong Kong Inst Environm Lab Lishui Rd Shenzhen 518057 Peoples R China;

    Peking Univ Sch Environm & Energy Key Lab Urban Habitat Environm Sci & Technol Shenzhen Grad Sch Sci & Technol Pk Shenzhen 518055 Peoples R 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

    OVOCs; O-3 formation potential; Diurnal variation; Photochemical age; Source apportionment;

    机译：OVOCS;O-3形成潜力;昼夜变异;光化学时代;来源分配;

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