A model study of the potential role of the reaction BrO+OH in the production of stratospheric HBr

被引：17

作者：

Chipperfield, MP

Shallcross, DE

Lary, DJ

机构：

[1] Department of Chemistry, University of Cambridge

[2] Department of Chemistry, Lensfield Rd.

来源：

GEOPHYSICAL RESEARCH LETTERS | 1997年 / 24卷 / 23期

关键词：

D O I：

10.1029/97GL53155

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We have used a constrained one-dimensional photochemical model to investigate the effect of a potential minor channel of the fast reaction between BrO + OH to produce HBr. There is no direct evidence for this reaction but the analogous yield of HCl from ClO + OH is thought to be about 5%. With only a 1-2% yield of HBr the modelled HBr mixing ratio between 20-30 km increases from around 0.5 parts per 10(12) by volume (pptv) to 1-2 pptv. This brings the model into agreement with recent balloon-borne observations of stratospheric HBr. Should BrO + OK produce HBr with around 1-2% yield then this reaction will dominate HBr production between 20-35 km. As the main loss of HBr is reaction with OH this will lead to steady state HBr:BrO partitioning which is independent of other species, and temperature.

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页码：3025 / 3028

页数：4

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