Physics – Geophysics
Scientific paper
Nov 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3721309d&link_type=abstract
Geophysical Research Letters, Volume 37, Issue 21, CiteID L21309
Physics
Geophysics
3
Marine Geology And Geophysics: Continental Shelf And Slope Processes (4219), Global Change: Abrupt/Rapid Climate Change (4901, 8408)
Scientific paper
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.
Carter Lionel
Davy Bryan
Gohl Karsten
Pecher Ingo
Wood Ray
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