Methane concentration and delta deuterium of methane from the NGRIP ice core, supplement to: Bock, Michael; Schmitt, Jochen; Möller, Lars; Spahni, Renato; Blunier, Thomas; Fischer, Hubertus (2010): Hydrogen isotopes preclude marine hydrate CH4 emissions at the onset of Dansgaard-Oeschger Events. Science, 328(5986), 1686-1689

Michael Bock, Jochen Schmitt, Lars Möller, Renato Spahni, Thomas Blunier & Hubertus Fischer
The causes of past changes in the global methane cycle and especially the role of marine methane hydrate (clathrate) destabilization events are a matter of debate. Here we present evidence from the North Greenland Ice Core Project ice core based on the hydrogen isotopic composition of methane [dD(CH4)] that clathrates did not cause atmospheric methane concentration to rise at the onset of Dansgaard-Oeschger (DO) events 7 and 8. Box modeling supports boreal wetland emissions as...
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