Uncertainties in gas-phase atmospheric iodine chemistry

Uncertainties in gas-phase atmospheric iodine chemistry
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气相大气碘化学的不确定性

DOI:
10.1016/j.atmosenv.2012.04.032
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发表时间:
2012
影响因子:
5
通讯作者:
Sommariva R
Sommariva R
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Sommariva R

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我们提出了气相碘的综合化学机制,用于模拟对流层化学。该机制是根据评估数据和个别文献研究(如果有)编制的;许多关键过程尚未经过实验或理论研究,在这些情况下已进行了估计。评估与这些假设相关的不确定性。我们使用盒模型在各种边界层场景(代表观察到碘物质的环境)下分析该机制,以研究化学系统对所选反应动力学参数变化的响应。我们特别关注 IO、OIO、INO3 和 I2Oy 等关键物种,以及碘化学对臭氧形成和 HOx 水平的影响。结果表明,化学系统对产生相对稳定的碘化合物的反应最敏感,这应该是未来实验室研究的重点。
We present a comprehensive chemical mechanism for gas-phase iodine, to be used for modelling tropospheric chemistry. The mechanism has been compiled from evaluated data and individual literature studies, where available; a number of key processes have not been studied experimentally or theoretically and in these cases estimations have been made. The uncertainty associated with these assumptions is evaluated. We analyze the mechanism using a box-model under a variety of boundary layer scenarios – representative of environments where iodine species have been observed – to study the response of the chemical system to changes in the kinetic parameters of selected reactions. We focus in particular on key species such as IO, OIO, INO3and I2Oyand the impact of iodine chemistry on ozone formation and HOxlevels. The results indicate that the chemical system is most sensitive to reactions leading to comparatively stable iodine compounds, which should be a focus of future laboratory studies.
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