Stable bromine isotopic composition of atmospheric CH3Br
2013 (English)In: Tellus. Series B, Chemical and physical meteorology, ISSN 0280-6509, E-ISSN 1600-0889, Vol. 65, 21040- p.Article in journal (Refereed) Published
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 (delta Br-81) of atmospheric CH3Br is presented. The delta Br-81 of higher concentration Stockholm samples and free air subarctic Abisko samples suggest a source/background value of -0.04 +/- 0.28 parts per thousand ranging up to +1.75 +/- 0.12 parts per thousand. The Stockholm delta Br-81 versus concentration relationship corresponds to an apparent isotope enrichment factor of -4.7 +/- 3.7 parts per thousand, representing the combined reaction sink. This study demonstrates the scientific potential of atmospheric delta Br-81 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.
Place, publisher, year, edition, pages
2013. Vol. 65, 21040- p.
tropospheric methyl bromide, 81Br/79Br, bromine isotopes, halogens, Stordalen, Arctic, ICPMS
Meteorology and Atmospheric Sciences
IdentifiersURN: urn:nbn:se:su:diva-94875DOI: 10.3402/tellusb.v65i0.21040ISI: 000324546700001OAI: oai:DiVA.org:su-94875DiVA: diva2:656580