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|a Gas escape features off New Zealand |h [electronic resource] |b Evidence of massive release of methane from hydrates. |
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|a [S.l.] : |b American Geophysical Union, |c 2010. |
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|a Geophysical Research Letters Volume 37. |
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|a Please contact the owning institution for licensing and permissions. It is the user's responsibility to ensure use does not violate any third party rights. |
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|a Multibeam swath bathymetry data from the southwest
margin of the Chatham Rise, New Zealand, show gas
release features over a region of at least 20,000 km2. Gas
escape features, interpreted to be caused by gas hydrate
dissociation, include an estimated a) 10 features, 8–11 km
in diameter and b) 1,000 features, 1–5 km in diameter,
both at 800–1,100 m water depth. An estimated 10,000
features, ∼150 m in diameter, are observed at 500–700 m
water depth. In the latter depth range sub‐bottom profiles
show similar gas escape features (pockmarks) at
disconformities interpreted to mark past sea‐level low
stands. The amount of methane potentially released from
hydrates at each of the largest features is ∼7*1012 g. If the
methane from a single event at one 8–11 km scale
pockmark reached the atmosphere, it would be equivalent
to ∼3% of the current annual global methane released from
natural sources into the atmosphere. |
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|a Electronic reproduction. |c Florida International University, |d 2015. |f (dpSobek) |n Mode of access: World Wide Web. |n System requirements: Internet connectivity; Web browser software. |
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|a dpSobek |c Sea Level Rise |
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|u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15061004/00001 |y Click here for full text |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/06/10/04/00001/FI15061004_thm.jpg |
