Journal
SCIENCE
Volume 311, Issue 5762, Pages 838-840Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1121235
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one explanation for the abrupt increases in atmospheric CH4, that occurred repeatedly during the Last glacial cycle involves clathrate destabalization events. Because marine clathrates have a distinct deuterium/hydrogen (D/H) isotope ratio, any such destabilization event should cause the D/H ratio of atmospheric CH4 (delta D-CH4) to increase. Analyses of air trapped in the ice from the second Greenland ice sheet project show stable and/or decreasing delta D-CH4 values during the end of the Younger and Older Dryas periods and one stadial period, suggesting that marine clathrates were stable during these abrupt warming episodes. Elevated glacial delta D-CH4 values may be the result of a lower ratio of net to gross wetland CH4 emissions and an increase in petroleum-based emissions.
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