Physics
Scientific paper
Feb 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3104109b&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 4, CiteID L04109
Physics
2
Atmospheric Composition And Structure: Constituent Sources And Sinks, Atmospheric Composition And Structure: Troposphere-Composition And Chemistry, Atmospheric Composition And Structure: Instruments And Techniques, Geochemistry: Isotopic Composition/Chemistry, Global Change: Biogeochemical Processes (4805)
Scientific paper
Methyl bromide (CH3Br) constitutes the largest source of bromine atoms to the stratosphere and plays an important role in stratospheric ozone depletion. However, the CH3Br atmospheric budget remains uncertain. We report the first measurements of stable carbon isotope ratios for atmospheric CH3Br and explore the constraints they provide for the atmospheric budget. The measured δ13C of CH3Br ranged from -44.8‰ to -41.2‰ (mean value -43.1‰, N = 7). This isotopic value is less negative than the anthropogenic source signature (-53.2 to -47.5‰), but is indistinguishable from the only quantified natural source signature (-43.0‰). Based on known source signatures and our atmospheric measurements, we predict that the mean kinetic isotope effect associated with sinks must be small (2-4‰). We further estimate that a total phaseout of anthropogenic sources would likely change the isotopic composition of atmospheric CH3Br by 2-4‰, and that this change would be difficult to detect with current measurement techniques.
Bill Markus
Conrad Mark E.
Goldstein Allen H.
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