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首页> 外文期刊>Atmospheric chemistry and physics >Characterization of nighttime formation of particulate organic nitrates based on high-resolution aerosol mass spectrometry in an urban atmosphere in China
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Characterization of nighttime formation of particulate organic nitrates based on high-resolution aerosol mass spectrometry in an urban atmosphere in China

机译：基于高分辨率气溶胶质谱法在中国城市大气中的颗粒状有机硝酸盐夜间形成的特征

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摘要

Organic nitrates are important atmospheric species that significantly affect the cycling of NO_x and ozone production.However, characterization of particulate organic nitrates and their sources in polluted atmosphere is a big challenge and has not been comprehensively studied in Asia.In this study, an aerodyne high-resolution time-of-flight aerosol mass spectrometer (HR-ToF-AMS) was deployed at an urban site in China from 2015 to 2016 to characterize particulate organic nitrates in total nitrates with a high time resolution.Based on the cross-validation of two different data processing methods, organic nitrates were effectively quantified to contribute a notable fraction of organic aerosol (OA), namely 9 %–21%in spring, 11 %–25%in summer, and 9 %-20% in autumn, while contributing a very small fraction in winter.The good correlation between organic nitrates and fresh secondary organic aerosol (SOA) at night, as well as the diurnal trend of size distribution of organic nitrates, indicated a key role of nighttime local secondary formation of organic nitrates.Furthermore, theoretical calculations of nighttime SOA production of NO3 reactions with volatile organic compounds (VOCs) measured during the spring campaign were performed, resulting in three biogenic VOCs ( -pinene, limonene, and camphene) and one anthropogenic VOC (styrene) identified as the possible key VOC precursors to particulate organic nitrates.The comparison with similar studies in the literature implied that nighttime particulate organic nitrate formation is highly relevant to NO_x levels.This study proposes that unlike the documented cases in the United States and Europe, modeling nighttime particulate organic nitrate formation in China should incorporate not only biogenic VOCs but also anthropogenic VOCs for urban air pollution, which needs the support of relevant smog chamber studies in the future.
机译：有机硝酸盐是重要的大气种类，显着影响NO_X和臭氧生产的循环。但是，颗粒状有机硝酸盐的表征及其在污染的气氛中的来源是一个很大的挑战，尚未在亚洲进行全面研究。这项研究中尚未全面研究。这项研究高 - 从2015年到2016年在中国的城市网站上部署了飞行时间的烟雾质量光谱仪（HR-TOF-AMS），以在全硝酸盐中表征颗粒状有机硝酸盐，具有高度分辨率。基于交叉验证两种不同的数据处理方法，有机硝酸盐被有效地定量了有机气溶胶（OA）的显着级数，即春季的9％-21％，夏季11％-25％，秋季9％-20％在冬季贡献非常小的分数。有机硝酸盐和新鲜二次有机气溶胶（SOA）在夜间的良好相关性，以及有机硝酸盐的大小分布的昼夜趋势，表明夜间局部次级形成有机硝酸盐的关系。进行春季运动期间测量的挥发性有机化合物（VOC）的夜间SOA生产的理论计算，导致三种生物转向(-丁烯，柠檬烯，和Camphene）和一个人为VOC（苯乙烯）被鉴定为可能的颗粒有机硝酸盐的关键VOC前体。与文献中类似研究的比较暗示夜间颗粒有机硝酸盐形成与NO_X水平高度相关。本研究提出与文件不同在美国和欧洲的案件，中国的夜间微粒有机硝酸盐形成不仅应纳入生物转霉品，也应纳入城市空气污染的人为VOC，这需要在未来的相关烟雾室研究的支持。

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  • 来源
    《Atmospheric chemistry and physics》 |2019年第2期|共15页
  • 作者

    Kuangyou Yu; Qiao Zhu; Ke Du; Xiao-Feng Huang;

  • 作者单位

    Key Laboratory for Urban Habitat Environmental Science and Technology School of Environment and Energy Peking University Shenzhen Graduate School Shenzhen 518055 China;

    Key Laboratory for Urban Habitat Environmental Science and Technology School of Environment and Energy Peking University Shenzhen Graduate School Shenzhen 518055 China;

    Department of Mechanical and Manufacturing Engineering University of Calgary Calgary Canada;

    Key Laboratory for Urban Habitat Environmental Science and Technology School of Environment and Energy Peking University Shenzhen Graduate School Shenzhen 518055 China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 大气科学（气象学）;
  • 关键词

    Characterization; nighttime formation; particulate organic;

    机译：表征;夜间形成;颗粒有机;

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