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Atmospheric lifetimes and ozone depletion potentials of methyl bromide (CH 3 Br) and dibromomethane (CH 2 Br 2 )

1992; American Geophysical Union; Volume: 19; Issue: 20 Linguagem: Inglês

10.1029/92gl01612

1944-8007

Abdelwahid Mellouki, Ranajit K. Talukdar, A. M. Schmoltner, Tomasz Gierczak, Michael Mills, Susan Solomon, A. R. Ravishankara,

Spectroscopy and Laser Applications

The rate coefficients for the reactions of OH radical with CH 3 Br and CH 2 Br 2 were measured as functions of temperature using the laser photolysis ‐ laser induced fluorescence method. This data was incorporated into a semi‐empirical model [Solomon et al., 1992] and a 2‐D model to calculate the steady ‐ state Ozone Depletion Potentials (ODP) and atmospheric lifetimes, τ, with greatly improved accuracy as compared to earlier studies. The calculated ODPs and τ are 0.65 and 1.7 years and 0.17 and 0.41 years for CH 3 Br and CH 2 Br 2 , respectively, using the semi‐empirical model. These lifetimes agree well with those calculated using a 2‐D model. This study better quantifies the ODPs and τ of these species which are needed inputs for discussion of possible regulation of human emissions currently under international considerations.