Hydrogen Isotopes Preclude Marine Hydrate CH 4 Emissions at the Onset of Dansgaard-Oeschger Events

Glacial Gas Intracellular bacterial pathogens, such as a series of sudden and large warming episodes, called Dansgaard-Oeschger events, interrupted the cold conditions of the last glacial period. Large increases in the concentration of atmospheric methane accompanied the events, whose causes have re...

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Bibliographic Details
Published in:Science
Main Authors: Bock, Michael, Schmitt, Jochen, Möller, Lars, Spahni, Renato, Blunier, Thomas, Fischer, Hubertus
Format: Article in Journal/Newspaper
Language:English
Published: American Association for the Advancement of Science (AAAS) 2010
Subjects:
Greenland
Dansgaard-Oeschger events
Greenland ice core
Greenland Ice core Project
ice core
North Greenland
North Greenland Ice Core Project
Online Access:http://dx.doi.org/10.1126/science.1187651
https://www.science.org/doi/pdf/10.1126/science.1187651
Description
Summary:Glacial Gas Intracellular bacterial pathogens, such as a series of sudden and large warming episodes, called Dansgaard-Oeschger events, interrupted the cold conditions of the last glacial period. Large increases in the concentration of atmospheric methane accompanied the events, whose causes have remained the object of much speculation. Bock et al. (p. 1686 ) report measurements of the hydrogen isotopic composition of methane recovered in the North Greenland Ice Core Project. The excess atmospheric methane accompanying two Dansgaard-Oeschger events did not come from marine clathrates; instead, the methane probably came from increased fluxes from boreal wetlands, another major source of methane.

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