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首页> 外文期刊>Atmospheric environment >Carbonyl compounds over urban Beijing: Concentrations on haze and non-haze days and effects on radical chemistry
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Carbonyl compounds over urban Beijing: Concentrations on haze and non-haze days and effects on radical chemistry

机译：北京市区的羰基化合物：霾天和非霾天的浓度及其对自由基化学的影响

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摘要

Carbonyl compounds play an important role in the formation of secondary aerosols and the cycling of free radicals in the atmosphere. We measured carbonyl compounds over urban Beijing, a megacity in the North China Plain, in summer and winter to investigate the relation of carbonyl compounds with haze and the interaction between carbonyl compounds and atmospheric radical cycling. We also determined carbonyl compounds in summer rainwater. Data of carbonyl compounds were analyzed in four cases, i.e., summer haze days (SHD), summer non-haze days (SND), winter haze days (WHD), and winter non-haze days (WND). Interestingly, the level of carbonyl compounds during WHO approached that of summer days. The results of the principal component analysis showed that there was no obvious source difference between SHD and SND. On WHO, however, more carbonyl compounds originated from the "diesel engine exhaust emission" than those on WND. We evaluated the effect of carbonyl compounds on the free radical cycling and the NO consumption potential for OH formation in the photochemical reactions using a novel ratio method. It was found that the production rate of ROx (the sum of OH, HO2 and RO2 radicals) was highest on SND, while the yield of ROx radicals from the reactions of carbonyl compounds was highest on WHD. Further, carbonyl compounds consumed more NO to produce OH radicals on WHO compared to the other three cases. (C) 2015 Elsevier Ltd. All rights reserved.
机译：羰基化合物在次级气溶胶的形成和大气中自由基的循环中起着重要作用。我们在夏季和冬季对北京市区（华北平原的一个大城市）上的羰基化合物进行了测量，以研究羰基化合物与雾度的关系以及羰基化合物与大气自由基循环之间的相互作用。我们还测定了夏季雨水中的羰基化合物。在夏季阴霾日（SHD），夏季阴霾日（SND），冬季阴霾日（WHD）和冬季阴霾日（WND）四种情况下分析了羰基化合物的数据。有趣的是，世卫组织期间羰基化合物的水平接近夏季。主成分分析的结果表明，SHD和SND之间没有明显的源差异。然而，在世界卫生组织上，“柴油发动机尾气排放”产生的羰基化合物多于WND。我们使用新型比例法评估了羰基化合物对自由基循环和光化学反应中OH形成的NO消耗潜力的影响。发现在SND上ROx的生成速率（OH，HO2和RO2自由基的总和）最高，而在WHD上，羰基化合物反应生成的ROx自由基的产率最高。此外，与其他三种情况相比，羰基化合物在WHO上消耗更多的NO来产生OH自由基。 （C）2015 Elsevier Ltd.保留所有权利。

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  • 来源
    《Atmospheric environment》 |2016年第janaptab期|207-216|共10页
  • 作者

    Rao Zhihan; Chen Zhongming; Liang Hao; Huang Liubin; Huang Dao;

  • 作者单位

    Peking Univ, Coll Environm Sci & Engn, State Key Lab Environm Simulat & Pollut Control, Beijing 100871, Peoples R China;

    Peking Univ, Coll Environm Sci & Engn, State Key Lab Environm Simulat & Pollut Control, Beijing 100871, Peoples R China;

    Peking Univ, Coll Environm Sci & Engn, State Key Lab Environm Simulat & Pollut Control, Beijing 100871, Peoples R China;

    Peking Univ, Coll Environm Sci & Engn, State Key Lab Environm Simulat & Pollut Control, Beijing 100871, Peoples R China;

    Zhejiang Univ, Dept Earth Sci, Hangzhou 310027, Zhejiang, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Carbonyl compound; Haze; Source; Radical cycling;

    机译：羰基化合物;雾度;来源;自由基循环;

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