Tropospheric OH and HO2 radicals: field measurements and model comparisons.
Tropospheric OH and HO2 radicals: field measurements and model comparisons.
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DOI：
10.1039/c2cs35140d
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发表时间：
2012-09
影响因子：
46.2
通讯作者：
D. Stone;L. Whalley;D. Heard
中科院分区：
文献类型：
--
作者：
D. Stone;L. Whalley;D. Heard
羟基自由基OH引发了大气中大多数微量气体的去除，并且与紧密耦合的物质羟基自由基HO(2)密切参与了大气的氧化化学。这篇重要的综述讨论了对流层中局部OH和HO(2)自由基浓度的现场测量，特别是与包含详细化学机制的数值模式计算的比较。OH和HO(2)浓度的现场测量值与给定位置的模型计算值之间的一致程度表明了对潜在氧化化学的理解程度。我们回顾了从地面和飞机上采样的一系列不同环境的测量模型比较，包括海洋边界层、受生物源排放影响的大陆低no (x)区域、受污染的城市边界层和极地地区。虽然在某些环境中发现了很好的一致性，但仍有无法解释的重大差异，一个显著的例子是未受污染的森林地区。OH和HO(2)自由基是对流层中难以测量的物种，我们还回顾了检测方法、质量保证程序（如仪器相互比较）和潜在干扰的变化。
The hydroxyl radical, OH, initiates the removal of the majority of trace gases in the atmosphere, and together with the closely coupled species, the hydroperoxy radical, HO(2), is intimately involved in the oxidation chemistry of the atmosphere. This critical review discusses field measurements of local concentrations of OH and HO(2) radicals in the troposphere, and in particular the comparisons that have been made with numerical model calculations containing a detailed chemical mechanism. The level of agreement between field measurements of OH and HO(2) concentrations and model calculations for a given location provides an indication of the degree of understanding of the underlying oxidation chemistry. We review the measurement-model comparisons for a range of different environments sampled from the ground and from aircraft, including the marine boundary layer, continental low-NO(x) regions influenced by biogenic emissions, the polluted urban boundary layer, and polar regions. Although good agreement is found for some environments, there are significant discrepancies which remain unexplained, a notable example being unpolluted, forested regions. OH and HO(2) radicals are difficult species to measure in the troposphere, and we also review changes in detection methodology, quality assurance procedures such as instrument intercomparisons, and potential interferences.