Kinetics of the reactions of OH with methyl chloroform and methane - Implications for global tropospheric OH and the methane budget

Details Kinetics of the reactions of OH with methyl chloroform and methane - Implications for global tropospheric OH and the methane budget Kinetics of the reactions of OH with methyl chloroform and methane - Implications for global tropospheric OH and the methane budget

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.1371f&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 13, July 6, 1992, p. 1371-1374. Research supported by NSF.

Statistics

Computation

8

Atmospheric Chemistry, Atmospheric Composition, Hydroxyl Radicals, Methane, Reaction Kinetics, Carbon Monoxide, Chloroform, Concentration (Composition)

Scientific paper

Fast flow discharge studies of the absolute rate constants for both the OH-CH3CCl3 and OH-CH4 reactions from 278-378 K in He at 1.05 +/-0.05 Torr pressure are reported. The rate constants at 298 and 277 K and 0.73 x 10 exp -14 cu cm/molecule s, respectively, are approximately 15 and 5 percent below the values now used to estimate global OH concentrations. The use of these lower rate constants in computations of global OH based on CH3CCl3 emissions and ambient measurements will increase the estimated OH concentrations, particularly at higher temperatures found in warmer equatorial regions. At 298 and 277 K, respectively, this gives values which are about 23 and 28 percent below the values which have generally been used in tropospheric models. The results support the recent suggestion that the methane flux may have been overestimated in the past.

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