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Climatically driven emissions of hydrocarbons from marine sediments during deglaciation.
MedLine Citation:
PMID:  16945904     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
Marine hydrocarbon seepage emits oil and gas, including methane ( approximately 30 Tg of CH(4) per year), to the ocean and atmosphere. Sediments from the California margin contain preserved tar, primarily formed through hydrocarbon weathering at the sea surface. We present a record of variation in the abundance of tar in sediments for the past 32,000 years, providing evidence for increases in hydrocarbon emissions before and during Termination IA [16,000 years ago (16 ka) to 14 ka] and again over Termination IB (11-10 ka). Our study provides direct evidence for increased hydrocarbon seepage associated with deglacial warming through tar abundance in marine sediments, independent of previous geochemical proxies. Climate-sensitive gas hydrates may modulate thermogenic hydrocarbon seepage during deglaciation.
Authors:
T M Hill; J P Kennett; D L Valentine; Z Yang; C M Reddy; R K Nelson; R J Behl; C Robert; L Beaufort
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Publication Detail:
Type:  Journal Article     Date:  2006-08-30
Journal Detail:
Title:  Proceedings of the National Academy of Sciences of the United States of America     Volume:  103     ISSN:  0027-8424     ISO Abbreviation:  Proc. Natl. Acad. Sci. U.S.A.     Publication Date:  2006 Sep 
Date Detail:
Created Date:  2006-09-13     Completed Date:  2006-10-30     Revised Date:  2010-09-15    
Medline Journal Info:
Nlm Unique ID:  7505876     Medline TA:  Proc Natl Acad Sci U S A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  13570-4     Citation Subset:  -    
Affiliation:
Department of Earth Science and Marine Science Institute, University of California, Santa Barbara, CA 93106, USA. tmhill@ucdavis.edu
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