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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >The importance of weak absorption features in promoting tropospheric radical production
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The importance of weak absorption features in promoting tropospheric radical production

机译：弱吸收特征对促进对流层自由基产生的重要性

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摘要

Atmospheric field measurement and modeling studies have long noted discrepancies between observation and predictions of OH and HO_2 concentrations in the atmosphere. Novel photochemical mechanisms have been proposed to explain these differences. Although inclusion of these additional sources improves agreement, they are unable to fully account for the observations. We report and demonstrate the importance of weak electronic absorption features, normally ignored or not measured, in contributing to significant OH radical production. Experiments on methyl hy-droperoxide, a prototypical organic peroxide in large abundance in the troposphere, highlights how photochemistry in the neglected electronic absorption tail makes an important addition to the tropospheric OH budget. The present results underscore the need to measure absorption cross sections for atmospheric molecules over a wider dynamic range, especially over the wavelength regions where the solar flux is high, to fully quantitate their contributions to atmospheric photochemistry.
机译：长期以来，大气场测量和模型研究都注意到大气中OH和HO_2浓度的观测与预测之间存在差异。已经提出了新颖的光化学机理来解释这些差异。尽管包含这些其他来源可以改善一致性，但是它们无法完全说明观察结果。我们报告并证明了弱电子吸收功能（通常被忽略或未测量）在促成大量OH自由基产生中的重要性。在对流层中大量存在的典型有机过氧化物甲基羟过氧化氢的实验强调了被忽略的电子吸收尾巴中的光化学如何增加对流层OH收支。目前的结果强调了需要在更宽的动态范围内测量大气分子的吸收截面，尤其是在太阳通量较高的波长范围内，以完全量化其对大气光化学的贡献。

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