OIO and the atmospheric cycle of iodine
OIO and the atmospheric cycle of iodine
复制标题
OIO 和碘的大气循环
DOI：
10.1029/1999gl900439
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发表时间：
1999
影响因子：
5.2
通讯作者：
D. M. Rowley
中科院分区：
文献类型：
--
作者：
R. A. Cox;W. Bloss;Roderic L. Jones;D. M. Rowley
IO和BrO自由基是碘和溴碳在大气中光氧化的中间体，可以作为臭氧损失的催化剂。我们已经研究了IO与自身和BrO的反应的动力学和机制，以确定它们在碘的大气化学中的作用。我们已经发现，在这些反应中产生了二氧化碘，OIO。这些和其他实验观察的结果以及最近的计算研究表明，OIO具有意想不到的高光化学稳定性。结果表明，OIO的形成和它的附着粒子可以解释高富集的碘在小尺寸的部分海洋气溶胶，这是重要的碘从海洋到大陆的传输。OIO可能是形成碘酸盐的途径，碘酸盐存在于大气降水中。OIO的形成还意味着碘催化臭氧损失的效率降低。
IO and BrO radicals are intermediates in the atmospheric photo‐oxidation of iodo‐ and bromocarbons and can act as catalysts for ozone loss. We have studied the kinetics and mechanisms of the reactions of IO with itself and with BrO to establish their role in the atmospheric chemistry of iodine. We have found that iodine dioxide, OIO, is produced in these reactions. The results of these and other experimental observations together with a recent computational study suggest an unexpectedly high photochemical stability for OIO. It is shown that OIO formation and its attachment to particles could account for the high enrichment of iodine in the small size fraction of marine aerosol, which is important for the transport of iodine from the sea to the continents. OIO may be a route to the formation of iodate, which is present in atmospheric precipitation. OIO formation also implies a reduced efficiency for iodine catalysed ozone loss.