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Atmospheric methyl bromide - Trends and global mass balanceA decadal time series of global CH3Br concentrations in the earth's atmosphere is presented. It is shown that average concentrations are about 10 pptv and during the last 4 yr may be increasing at 0.3 +/- 0.1 pptv/yr. It is estimated that the atmospheric lifetime of CH3Br that is due to reaction with OH is about 2 yr, which results in a calculated global emission rate of about 100 Gg/yr. Ocean supersaturations of 140-180 percent are observed, and atmospheric concentrations over the open oceans are higher than at comparably located coastal sites. The ocean source is estimated to be about 35 Gg/yr. The remaining emissions must come from other natural sources and anthropogenic activities.
Document ID
19930044355
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Khalil, M. A. K.
(NASA Headquarters Washington, DC United States)
Rasmussen, R. A.
(NASA Headquarters Washington, DC United States)
Gunawardena, R.
(Oregon Graduate Inst. Beaverton, United States)
Date Acquired
August 16, 2013
Publication Date
February 20, 1993
Publication Information
Publication: Journal of Geophysical Research
Volume: 98
Issue: D2
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
93A28352
Funding Number(s)
CONTRACT_GRANT: NSF DPP-87-17023
CONTRACT_GRANT: NSF ATM-81-09047
CONTRACT_GRANT: NSF ATM-88-11059
Distribution Limits
Public
Copyright
Other

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