Gas escape features off New Zealand – Evidence for a massive release of methane from hydrates

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dc.contributor.author Davy, B en
dc.contributor.author Pecher, Ingo en
dc.contributor.author Wood, R en
dc.contributor.author Carter, L en
dc.contributor.author Gohl, K en
dc.date.accessioned 2012-03-12T20:28:58Z en
dc.date.issued 2010 en
dc.identifier.citation Geophysical Research Letters 37:5 pages Article number L21309 2010 en
dc.identifier.issn 0094-8276 en
dc.identifier.uri http://hdl.handle.net/2292/13986 en
dc.description.abstract 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. en
dc.publisher American Geophysical Union en
dc.relation.ispartofseries Geophysical Research Letters en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. Details obtained from http://www.sherpa.ac.uk/romeo/issn/0094-8276/ en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.title Gas escape features off New Zealand – Evidence for a massive release of methane from hydrates en
dc.type Journal Article en
dc.identifier.doi 10.1029/2010GL045184 en
pubs.volume 37 en
dc.rights.holder Copyright: American Geophysical Union en
dc.rights.accessrights http://purl.org/eprint/accessRights/RestrictedAccess en
pubs.subtype Article en
pubs.elements-id 276577 en
pubs.org-id Science en
pubs.org-id School of Environment en
pubs.number L21309 en
pubs.record-created-at-source-date 2012-01-20 en


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