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An investigation of the atmospheric sources and sinks of Methyl BromideMethyl Bromide (CH3Br) is a ubiquitous component of the atmosphere and has been implicated as an important player in the depletion of stratospheric ozone. Atmospheric CH3Br abundances, interhemispheric gradients, oceanic concentrations, man-made emissions, and removal processes have been analyzed and interpreted with the help of a simple box model and a 2D global photochemical model. Its calculated atmospheric lifetime (T) of 1.7-1.9 years, based on reaction with OH radicals, is consistent with a global source of 90-110 Gg (10 exp 9 g)/year. Consequences of a much shorter lifetime of 1.2 years, due to possible deposition/hydrolysis losses, are also considered. Available data are used to estimate a CH3Br source that is 35 percent (20-50 percent) man-made and 65 percent (80-50 percent) natural. Oceans are substantially supersaturated and provide the most important natural source of about 60 (40-80) Gg/year.
Document ID
19930042295
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Singh, Hanwant B.
(NASA Ames Research Center Moffett Field, CA, United States)
Kanakidou, M.
(CNRS Centre de Faibles Radioactivites, Gif-sur-Yvette, France)
Date Acquired
August 16, 2013
Publication Date
January 22, 1993
Publication Information
Publication: Geophysical Research Letters
Volume: 20
Issue: 2
ISSN: 0094-8276
Subject Category
Environment Pollution
Accession Number
93A26292
Distribution Limits
Public
Copyright
Other

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