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Late Quaternary atmospheric CH4 isotope record suggests marine clathrates are stable.
MedLine Citation:
PMID:  16469923     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
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 (deltaD(CH4)) to increase. Analyses of air trapped in the ice from the second Greenland ice sheet project show stable and/or decreasing deltaD(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 deltaD(CH4) values may be the result of a lower ratio of net to gross wetland CH4 emissions and an increase in petroleum-based emissions.
Authors:
Todd Sowers
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Science (New York, N.Y.)     Volume:  311     ISSN:  1095-9203     ISO Abbreviation:  Science     Publication Date:  2006 Feb 
Date Detail:
Created Date:  2006-02-10     Completed Date:  2006-02-17     Revised Date:  2007-03-19    
Medline Journal Info:
Nlm Unique ID:  0404511     Medline TA:  Science     Country:  United States    
Other Details:
Languages:  eng     Pagination:  838-40     Citation Subset:  -    
Affiliation:
Department of Geosciences and the Earth and Environmental Systems Institute, Pennsylvania State University, University Park, PA 16802, USA. sowers@geosc.psu.edu
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