Dissociation of Cascadia margin gas hydrates in response to contemporary ocean warming

Hautala, Susan L.; Solomon, Evan A.; Johnson, H. Paul; Harris, Robert N.; Miller, Una K.

doi:10.1002/2014GL061606

Dissociation of Cascadia margin gas hydrates in response to contemporary ocean warming

Journal Article · Thu Dec 04 23:00:00 EST 2014 · Geophysical Research Letters

DOI:https://doi.org/10.1002/2014GL061606· OSTI ID:1402348

Hautala, Susan L. ^[1]; Solomon, Evan A. ^[1]; Johnson, H. Paul ^[1]; Harris, Robert N. ^[2]; Miller, Una K. ^[1]

School of Oceanography University of Washington Seattle Washington USA
College of Earth, Ocean, and Atmospheric Sciences Oregon State University Corvallis Oregon USA

Abstract

Gas hydrates, pervasive in continental margin sediments, are expected to release methane in response to ocean warming, but the geographic range of dissociation and subsequent flux of methane to the ocean are not well constrained. Sediment column thermal models based on observed water column warming trends offshore Washington (USA) show that a substantial volume of gas hydrate along the entire Cascadia upper continental slope is vulnerable to modern climate change. Dissociation along the Washington sector of the Cascadia margin alone has the potential to release 45–80 Tg of methane by 2100. These results highlight the importance of lower latitude warming to global gas hydrate dynamics and suggest that contemporary warming and downslope retreat of the gas hydrate reservoir occur along a larger fraction of continental margins worldwide than previously recognized.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FE0013998

OSTI ID:: 1402348

Journal Information:: Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 23 Vol. 41; ISSN 0094-8276

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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