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Summertime OH reactivity from a receptor coastal site in the Mediterranean Basin

机译：夏季哦反应性来自地中海盆地的受体沿海网站

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摘要

Total hydroxyl radical (OH) reactivity, the total loss frequency of the hydroxyl radical in ambient air, provides the total loading of OH reactants in air. We measured the total OH reactivity for the first time during summertime at a coastal receptor site located in the western Mediterranean Basin. Measurements were performed at a temporary field site located in the northern cape of Corsica (France), during summer 2013 for the project CARBOSOR (CARBOn within continental pollution plumes: SOurces and Reactivity)-ChArMEx (Chemistry and Aerosols Mediterranean Experiment). Here, we compare the measured total OH reactivity with the OH reactivity calculated from the measured reactive gases. The difference between these two parameters is termed missing OH reactivity, i.e., the fraction of OH reactivity not explained by the measured compounds. The total OH reactivity at the site varied between the instrumental LoD (limit of detection = 3 s(-1)) to a maximum of 17 +/- 6 s(-1) (35% uncertainty) and was 5 +/- 4 s(-1) (1 +/- SD standard deviation) on average. It varied with air temperature exhibiting a diurnal profile comparable to the reactivity calculated from the concentration of the biogenic volatile organic compounds measured at the site. For part of the campaign, 56% of OH reactivity was unexplained by the mea-sured OH reactants (missing reactivity). We suggest that oxidation products of biogenic gas precursors were among the contributors to missing OH reactivity.
机译：总羟基 - 自由基（OH）反应性，环境空气中羟基的总损失频率，在空气中提供了OH反应物的总负载。我们在位于西地中海盆地的沿海受体遗址夏季的夏季期间首次测量了总OH反应性。在2013年夏季，在2013年夏季，在夏季，临时现场进行了测量，该临时现场在2013年夏季为项目碳（碳污染羽毛内的碳：来源和反应性） - 屠杀（化学和气溶胶地中海实验）。这里，我们将测量的总OH反应性与由测量的反应气体计算的OH反应性进行比较。这两个参数之间的差异被称为缺少OH反应性，即未被测量的化合物解释的OH反应性的分数。站点的总OH反应性在仪器床上变化（检测限= 3 s（-1））至最多17 +/- 6 s（-1）（35％的不确定性），为5 +/- 4 S（-1）（1 +/-SD标准偏差）平均。气温变化，空气温度显示出与由在该部位测量的生物挥发性有机化合物的浓度计算的反应性相当的昼型分布。对于部分运动，MEA-Sured OH反应物（缺失的反应性）是不明原因的56％的OH反应性。我们建议生物燃气前体的氧化产物是缺少OH反应性的贡献者之一。

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  • 来源
    《Atmospheric chemistry and physics》 |2017年第20期|共14页
  • 作者

    Zannoni Nora; Gros Valerie; Esteve Roland Sarda; Kalogridis Cerise; Michoud Vincent; Dusanter Sebastien; Sauvage Stephane; Locoge Nadine; Colomb Aurelie; Bonsang Bernard;

  • 作者单位

    Univ Paris Saclay LSCE CNRS CEA UVSQ IPSL F-91191 Gif Sur Yvette France;

    Univ Paris Saclay LSCE CNRS CEA UVSQ IPSL F-91191 Gif Sur Yvette France;

    Univ Paris Saclay LSCE CNRS CEA UVSQ IPSL F-91191 Gif Sur Yvette France;

    Univ Paris Saclay LSCE CNRS CEA UVSQ IPSL F-91191 Gif Sur Yvette France;

    Univ Lille IMT Lille Douai SAGE Depat Sci Atmosphere &

    Genie Environm F-59000 Lille France;

    Univ Lille IMT Lille Douai SAGE Depat Sci Atmosphere &

    Genie Environm F-59000 Lille France;

    Univ Lille IMT Lille Douai SAGE Depat Sci Atmosphere &

    Genie Environm F-59000 Lille France;

    Univ Lille IMT Lille Douai SAGE Depat Sci Atmosphere &

    Genie Environm F-59000 Lille France;

    LAMP Campus Univ Cezeaux 4 Ave Blaise Pascal F-63178 Aubiere France;

    Univ Paris Saclay LSCE CNRS CEA UVSQ IPSL F-91191 Gif Sur Yvette France;

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  • 正文语种 eng
  • 中图分类 大气科学（气象学）;
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