Atmospheric lifetimes and ozone depletion potentials of methyl bromide (CH3Br) and dibromomethane (CH2Br2)

Journal Article · Thu Oct 01 00:00:00 EDT 1992 · Geophysical Research Letters (American Geophysical Union); (United States)

DOI:https://doi.org/10.1029/92GL01612· OSTI ID:7184465

Mellouki, A; Talukdar, R K; Schmoltner, A; Gierczak, T; Mills, M J; Solomon, S; Ravishankara, A R ^[1]

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1. NOAA, Boulder, CO (United States)

The rate coefficients for the reactions of OH radical with CH3Br and CH2Br2 were measured as functions of temperature using the laser photolysis - laser induced fluorescence method. This data was incorporated into a semiempirical model (Solomon et al., 1992) and a 2D model to calculate the steady-state ozone depletion potentials (ODP) and atmospheri lifetimes, tau, with greatly improved accuracy as compared to earlier studies. The calculated ODPs and tau are 0.65 and 1.7 years and 0.17 and 0.41 years for CH3Br and CH2Br2, respectively, using the semiempirical model. These lifetimes agree well with those calculated using a 2D model. This study better quantifies the ODPs and tau of these species which are needed inputs for discussion of possible regulation of human emissions currently under international considerations. 29 refs.

• OSTI ID: 7184465
• Journal Information: Geophysical Research Letters (American Geophysical Union); (United States), Vol. 19:20; ISSN 0094-8276
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
BROMINATED ALIPHATIC HYDROCARBONS
ATMOSPHERIC CHEMISTRY
ECOLOGICAL CONCENTRATION
METHYL BROMIDE
OZONE
CHEMICAL REACTION KINETICS
EARTH ATMOSPHERE
FLUORESCENCE
HYDROXYL RADICALS
MATHEMATICAL MODELS
PHOTOLYSIS
CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
HALOGENATED ALIPHATIC HYDROCARBONS
KINETICS
LUMINESCENCE
ORGANIC BROMINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
RADICALS
REACTION KINETICS
540120* - Environment
Atmospheric- Chemicals Monitoring & Transport- (1990-)