OIO and the atmospheric cycle of iodine

被引:66
作者
Cox, RA
Bloss, WJ
Jones, RL
Rowley, DM
机构
[1] Univ Cambridge, Chem Lab, Ctr Atmospher Sci, Cambridge CB2 1EW, England
[2] Univ London Univ Coll, Dept Chem, London WC1H 0AJ, England
关键词
D O I
10.1029/1999GL900439
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
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.
引用
收藏
页码:1857 / 1860
页数:4
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