Stable bromine isotopic composition of atmospheric CH3Br

Tropospheric methyl bromide (CH3Br) is the largest source of bromine to the stratosphere and plays an important role in ozone depletion. Here, the first stable bromine isotope composition (dgr81Br) of atmospheric CH3Br is presented. The dgr81Br of higher concentration Stockholm samples and free air...

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Bibliographic Details
Published in:Tellus B: Chemical and Physical Meteorology
Main Authors: Axel Horst, Brett F. Thornton, Henry Holmstrand, Per Andersson, Patrick M. Crill, Örjan Gustafsson
Format: Article in Journal/Newspaper
Language:English
Published: Stockholm University Press 2013
Subjects:
tropospheric methyl bromide
81Br/79Br
bromine isotopes
halogens
Stordalen
Arctic
ICPMS
Meteorology. Climatology
QC851-999
Abisko
Subarctic
Online Access:https://doi.org/10.3402/tellusb.v65i0.21040
https://doaj.org/article/6505e880d83c461ea7f3117cee5e7893
Description
Summary:Tropospheric methyl bromide (CH3Br) is the largest source of bromine to the stratosphere and plays an important role in ozone depletion. Here, the first stable bromine isotope composition (dgr81Br) of atmospheric CH3Br is presented. The dgr81Br of higher concentration Stockholm samples and free air subarctic Abisko samples suggest a source/background value of minus0.04plusmn0.28permil ranging up to +1.75plusmn0.12permil. The Stockholm dgr81Br versus concentration relationship corresponds to an apparent isotope enrichment factor of minus4.7plusmn3.7permil, representing the combined reaction sink. This study demonstrates the scientific potential of atmospheric dgr81Br measurements, which in the future may be combined with other isotope systems in a top-down inverse approach to further understand key source and sink processes of methyl bromide.

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