Changing boreal methane sources and constant biomass burning during the last termination

Hubertus Fischer (), Melanie Behrens, Michael Bock, Ulrike Richter, Jochen Schmitt, Laetitia Loulergue, Jerome Chappellaz, Renato Spahni, Thomas Blunier, Markus Leuenberger and Thomas F. Stocker
Additional contact information
Hubertus Fischer: Alfred Wegener Institute for Polar and Marine Research, Columbusstrasse, 27568 Bremerhaven, Germany
Melanie Behrens: Alfred Wegener Institute for Polar and Marine Research, Columbusstrasse, 27568 Bremerhaven, Germany
Michael Bock: Alfred Wegener Institute for Polar and Marine Research, Columbusstrasse, 27568 Bremerhaven, Germany
Ulrike Richter: Alfred Wegener Institute for Polar and Marine Research, Columbusstrasse, 27568 Bremerhaven, Germany
Jochen Schmitt: Alfred Wegener Institute for Polar and Marine Research, Columbusstrasse, 27568 Bremerhaven, Germany
Laetitia Loulergue: Laboratoire de Glaciologie et Geophysique de l’Environnement, CNRS-UJF, 54 rue Molière, 38400 Grenoble, France
Jerome Chappellaz: Laboratoire de Glaciologie et Geophysique de l’Environnement, CNRS-UJF, 54 rue Molière, 38400 Grenoble, France
Renato Spahni: Climate and Environmental Physics, Physics Institute, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland
Thomas Blunier: Climate and Environmental Physics, Physics Institute, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland
Markus Leuenberger: Climate and Environmental Physics, Physics Institute, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland
Thomas F. Stocker: Climate and Environmental Physics, Physics Institute, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland

Nature, 2008, vol. 452, issue 7189, 864-867

Abstract: A history of biomass burning An EPICA ice core drilled in Dronning Maud Land in Antarctica has been used to derive a record of carbon isotopic ratios in methane over the entire last glacial–interglacial transition. The data show that the carbon in atmospheric methane is isotopically much heavier in cold climate periods. Biomass burning is the only natural source of methane strongly enriched in carbon-13, and the combination of δ13CH4 data with earlier results and box modelling suggest that methane emissions due to biomass burning remained approximately constant throughout the glacial termination, that the atmospheric lifetime of methane is reduced during cold climate periods and that wetlands are an important source of methane during warming events.

Date: 2008
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DOI: 10.1038/nature06825

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