Role of the BRO + HO[sub 2] reaction in the stratospheric chemistry of bromine

Journal Article · Wed Dec 02 04:00:00 EST 1992 · Geophysical Research Letters (American Geophysical Union); (United States)

DOI:https://doi.org/10.1029/92GL00781· OSTI ID:6999442

Poulet, G; Pirre, M; Maguin, F; Bras, G Le ^[1]; Ramaroson, R ^[2]

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1. Centre National de la Recherche Scientifique, Orleans (France)
2. Office National d'Etudes et de Recherches Aerospatiales, Chatillon (France)

The impact of new laboratory data for the reaction BrO + HO[sub 2] --> HOBr + O[sub 2] 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% 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[sub 2] reaction. The influence of the existing uncertainty in the photolysis rate of HOBr is also analyzed.

• OSTI ID: 6999442
• Journal Information: Geophysical Research Letters (American Geophysical Union); (United States), Journal Name: Geophysical Research Letters (American Geophysical Union); (United States) Vol. 19:23; ISSN GPRLAJ; ISSN 0094-8276
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
ATMOSPHERIC CHEMISTRY
BROMINE
BROMINE COMPOUNDS
BROMINE OXIDES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
EARTH ATMOSPHERE
ELEMENTS
HALOGEN COMPOUNDS
HALOGENS
KINETICS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
OZONE
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
REACTION KINETICS
STRATOSPHERE