ROLE OF THE BRO + HO2 REACTION IN THE STRATOSPHERIC CHEMISTRY OF BROMINE

被引:103
作者
POULET, G
PIRRE, M
MAGUIN, F
RAMAROSON, R
LEBRAS, G
机构
[1] OFF NATL ETUD & RECH AEROSP,F-92322 CHATILLON,FRANCE
[2] CNRS,PHYS & CHIM ENVIRONM LAB,ORLEANS,FRANCE
关键词
D O I
10.1029/92GL00781
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The impact of new laboratory data for the reaction BrO + HO2 --> HOBr + O2 has been estimated in a one-dimensional photochemical modelling of bromine/ozone stratospheric chemistry. The reported 6 fold increase in the measured value for the rate constant of this reaction significantly increases both the HOBr mixing ratio and the global ozone depletion due to bromine compounds (the calculated ozone loss increases from 1. 14% to 1.45% for a 20 ppt total bromine content). The higher rate constant makes the bromine partitioning and the ozone depletion very sensitive to the branching ratio of the potential channel forming HBr in the BrO + HO2 reaction. The influence of the existing uncertainty in the photolysis rate of HOBr is also analysed.
引用
收藏
页码:2305 / 2308
页数:4
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