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Hydrogen isotopes preclude marine hydrate CH4 emissions at the onset of Dansgaard-Oeschger events
Bock, M.; Schmitt, J.; Möller, L.; Spahni, R.; Blunier, T.; Fischer, H. (2010). Hydrogen isotopes preclude marine hydrate CH4 emissions at the onset of Dansgaard-Oeschger events. Science (Wash.) 328(5986): 1686-1689. dx.doi.org/10.1126/science.1187651
In: Science (Washington). American Association for the Advancement of Science: New York, N.Y. ISSN 0036-8075, more
Peer reviewed article  

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Keyword
    Marine

Authors  Top 
  • Bock, M.
  • Schmitt, J.
  • Möller, L.
  • Spahni, R.
  • Blunier, T.
  • Fischer, H.

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 [{delta}D(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 {delta}D(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.

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