Book ; Online: Methan concentration and delta deuterium of methane from the NGRIP ice core, supplementary data to: Bock, Michael; Schmitt, Jochen; M?ller, 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
2010
Abstract: 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 ... ...
| Abstract | 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 the most likely explanation for the interstadial increase. Moreover, our data show that dD(CH4) dropped 500 years before the onset of DO 8, with CH4 concentration rising only slightly. This can be explained by an early climate response of boreal wetlands, which carry the strongly depleted isotopic signature of high-latitude precipitation at that time. |
|---|---|
| Language | English |
| Dates of publication | 2010-9999 |
| Size | Online-Ressource |
| Publisher | PANGAEA - Data Publisher for Earth & Environmental Science |
| Publishing place | Bremen/Bremerhaven |
| Document type | Book ; Online |
| Note | This dataset is supplement to doi:10.1126/science.1187651 |
| DOI | 10.1594/PANGAEA.756715 |
| Database | Library catalogue of the German National Library of Science and Technology (TIB), Hannover |
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