Affiliation:
1. Department of Chemistry, University of California at Irvine, Irvine, CA 92697–2025, USA.
Abstract
The atmospheric residence time for methyl bromide (CH
3
Br) has been estimated as 0.8 ± 0.1 years from its empirical spatial variability relative to C
2
H
6
, C
2
Cl
4
, CHCl
3
, and CH
3
Cl. This evaluation of the atmospheric residence time, based on Junge's 1963 general proposal, provides an estimate for CH
3
Br that is independent of source and sink estimates. Methyl bromide from combined natural and anthropogenic sources furnishes about half of the bromine that enters the stratosphere, where it plays an important role in ozone destruction. This residence time is consistent with the 0.7-year value recently calculated for CH
3
Br from the combined strength estimates for its known significant sinks.
Publisher
American Association for the Advancement of Science (AAAS)
Reference20 articles.
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