Unexpectedly high concentrations of molecular chlorine in coastal air
Unexpectedly high concentrations of molecular chlorine in coastal air
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DOI：
10.1038/28584
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发表时间：
1998-07-23
期刊：
影响因子：
64.8
通讯作者：
Berkowitz, CM
中科院分区：
文献类型：
--
作者：
Spicer, CW;Chapman, EG;Berkowitz, CM
大气中许多痕量物质，包括污染物如氮氧化物和一些挥发性有机物的命运都是由氧化反应控制的，在白天的对流层中，这些反应主要是由光化学产生的OH自由基控制的；在夜间和污染环境中，NO(3)自由基是一种重要的氧化剂(1)。近年来，实验室研究（2-4）、模拟研究（5-7）、海洋气溶胶中测量的Cl亏缺(8)以及非HCl的气态无机氯化合物的物种非特异性观测（9-11）表明，活性卤素物种可能对海洋对流层低层的氧化能力有重大贡献，甚至在局部起主导作用。在这里，我们报告了在陆上风流条件下北美沿海地区分子氯浓度的夜间观测结果，这种情况无法用已知的氯化学来解释。测定的Cl(2)混合比范围为
The fate of many atmospheric trace species, including pollutants such as nitrogen oxides and some volatile organic compounds, is controlled by oxidation reactions, In the daytime troposphere, these reactions are dominated by photochemically produced OH radicals; at night and in polluted environments, NO(3) radicals are an important oxidant(1). Ozone can contribute to the oxidation of atmospheric species during both day and night(1), In recent years, laboratory investigations(2-4), modelling studies(5-7), measured Cl deficits in marine aerosols(8) and species-nonspecific observations(9-11) of gaseous inorganic chlorine compounds other than HCl have suggested that reactive halogen species may contribute significantly to-or even locally dominate-the oxidative capacity of the lower marine troposphere. Here we report nighttime observations of molecular chlorine concentrations at a North American coastal site during onshore wind flow conditions that cannot be explained using known chlorine chemistry. The measured Cl(2) mixing ratios range from