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

机译：地中海盆地受体沿海地区夏季的OH反应性

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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?ssup?1/sup) to a maximum of 17?±?6?ssup?1/sup (35?% uncertainty) and was 5?±?4?ssup?1/sup (1iσ/i?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 measured 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，即周围空气中羟基自由基的总损失频率，提供了空气中OH反应物的总负载量。我们在夏季首次在位于地中海盆地西部的沿海受体站点测量了总OH反应性。在2013年夏季，在位于科西嘉岛北部海角（法国）的临时现场对CARBOSOR（大陆污染羽状流中的CARBON：SOurces和Reactivity）＆ChArMEx（化学和气溶胶地中海实验）项目进行了测量。在这里，我们将测得的总OH反应性与根据测得的反应气体计算出的OH反应性进行比较。这两个参数之间的差异被称为OH反应性缺失，即，所测化合物未解释的OH反应性分数。该部位的总OH反应性在仪器的LoD（检测极限?? =？3？s ？1 ）至最大值17？±？6？s ？1之间变化。 （不确定度为35％），平均为5？±？4？s ？1 （1 σ？SD标准差）。它随气温变化而变化，其昼夜曲线可与根据现场测量的生物挥发性有机化合物的浓度计算得出的反应性相媲美。在运动的一部分中，被测的OH反应物无法解释56％的OH反应性（缺少反应性）。我们建议生物气体前体的氧化产物是缺少OH反应性的原因之一。

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