Publication Date:
2022-05-25
Description:
Author Posting. © The Authors, 2006. This is the author's version of the work. It is posted here by permission of National Academy of Sciences for personal use, not for redistribution. The definitive version was published in Proceedings of the National Academy of Sciences of the United States of America 103 (2006): 13570-13574, doi:10.1073/pnas.0601304103.
Description:
Marine hydrocarbon seepage emits oil and gas, including methane (~30 Tg
CH4/year), to the ocean and atmosphere. Sediments from the California margin
contain preserved tar, primarily formed via hydrocarbon weathering at the sea
surface. We present a record of variation in the abundance of tar in sediments for
the past 32ky, providing evidence for increases in hydrocarbon emissions prior to
and during Termination IA (16-14 ka) and again over Termination IB (11-10 ka).
Our study provides the first direct evidence for increased hydrocarbon seepage
associated with deglacial warming via tar abundance in marine sediments,
independent of previous geochemical proxies. Climate-sensitive gas hydrates may
modulate thermogenic hydrocarbon seepage during deglaciation.
Description:
This work has been supported by the U.S. National
Science Foundation (OCE-0242041, Kennett; OCE-0447395, Valentine; IIS-0430835, Reddy)
and UC Santa Barbara (Graduate Dissertation Fellowship to T. Hill).
Keywords:
Quaternary climate
;
Paleoclimate
;
Hydrocarbon
;
Methane
Repository Name:
Woods Hole Open Access Server
Type:
Preprint
Format:
2373422 bytes
Format:
application/pdf
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