The role of atomic chlorine in glacial-interglacial changes in the carbon-13 content of atmospheric methane

Details The role of atomic chlorine in glacial-interglacial changes in the carbon-13 content of atmospheric methane The role of atomic chlorine in glacial-interglacial changes in the carbon-13 content of atmospheric methane

Feb 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3804801l&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 4, CiteID L04801

Physics

Atmospheric Composition And Structure: Constituent Sources And Sinks, Atmospheric Composition And Structure: Troposphere: Composition And Chemistry, Atmospheric Composition And Structure: Air/Sea Constituent Fluxes (3339, 4504), Cryosphere: Ice Cores (4932)

Scientific paper

The ice-core record of the carbon-13 content of atmospheric methane (δ13CH4) has largely been used to constrain past changes in methane sources. The aim of this paper is to explore, for the first time, the contribution that changes in the strength of a minor methane sink―oxidation by atomic chlorine in the marine boundary layer (ClMBL)―could make to changes in δ13CH4 on glacial-interglacial timescales. Combining wind and temperature data from a variety of general circulation models with a simple formulation for the concentration of ClMBL, we find that changes in the strength of this sink, driven solely by changes in the atmospheric circulation, could have been responsible for changes in δ13CH4 of the order of 10% of the glacial-interglacial difference observed. We thus highlight the need to quantify past changes in the strength of this sink, including those relating to changes in the sea-ice source of sea salt aerosol.

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