Role of the BrO + HO2 reaction in the stratospheric chemistry of bromine

Details Role of the BrO + HO2 reaction in the stratospheric chemistry of bromine Role of the BrO + HO2 reaction in the stratospheric chemistry of bromine

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.2305p&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 23, p. 2305-2308.

Physics

33

Atmospheric Chemistry, Bromine Compounds, Hydroxyl Radicals, Ozone Depletion, Reaction Kinetics, Stratosphere, Bromine, Photochemical Reactions

Scientific paper

The impact of new laboratory data for the reaction BrO + HO2 yields HOBr + O2 has been estimated in a one-dimensional photochemical modeling 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 percent to 1.45 percent 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 analyzed.

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