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Role of the BRO + HO 2 reaction in the stratospheric chemistry of bromine
Author(s) -
Poulet Gilles,
Pirre Michel,
Maguin Françoise,
Ramaroson Radiela,
Le Bras Georges
Publication year - 1992
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/92gl00781
Subject(s) - bromine , ozone , ozone depletion , chemistry , reaction rate constant , photodissociation , mixing ratio , atmospheric chemistry , ozone layer , reaction rate , photochemistry , catalysis , organic chemistry , kinetics , physics , quantum mechanics
The impact of new laboratory data for the reaction BrO + HO 2 → HOBr + O 2 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 + HO 2 reaction. The influence of the existing uncertainty in the photolysis rate of HOBr is also analysed.