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TitleComparing the sensitivity of permafrost and marine gas hydrate to climate warming
DownloadDownload (whole publication)
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorTaylor, A E; Dallimore, S R; Hyndman, R D; Wright, F
SourceScientific Results from the Mallik 2002 Gas Hydrate Production Research Well Program, Mackenzie Delta, Northwest Territories, Canada; by Dallimore, S R (ed.); Collett, T S (ed.); Geological Survey of Canada, Bulletin no. 585, 2005, 11 pages; 1 CD-ROM, (Open Access)
PublisherNatural Resources Canada
MediaCD-ROM; on-line; digital
RelatedThis publication is contained in Dallimore, S R; Collett, T S; (2005). Scientific Results from the Mallik 2002 Gas Hydrate Production Research Well Program, Mackenzie Delta, Northwest Territories, Canada, Geological Survey of Canada, Bulletin no. 585
File formatpdf
ProvinceNorthwest Territories; Western offshore region
NTS107C/02; 107C/03; 107C/04; 107C/05; 107C/06; 107C/07; 107C/10; 107C/11; 107C/12; 107C/13; 107C/14; 107C/15
AreaMackenzie Delta; Beaufort Sea; Kopanoar
Lat/Long WENS-136.0000 -133.0000 70.0000 69.0000
Lat/Long WENS-127.0000 -126.0000 48.7500 48.2500
Subjectsfossil fuels; surficial geology/geomorphology; geophysics; Nature and Environment; hydrocarbons; gas; hydrocarbon gases; hydrate; methane; methane hydrate; petroleum resources; biogenic gas; temperature; thermal analyses; geothermal surveys; terrain sensitivity; permafrost; marine environments; continental shelf; slope failures; sea level changes; Mallik 5L-38; methanogens; climate change; Tertiary; Cenozoic
Illustrationstables; graphs; histograms; sketch maps
ProgramMallik 2002 Gas Hydrate Production Research Well Program
Released2005 08 25
AbstractFinite-element geothermal models were used to compare the sensitivity of arctic subpermafrost gas hydrate at the Mallik borehole to temperate marine gas hydrate located offshore southwestern Canada. Considering the thermal signal alone accompanying the end of the last ice age, a 30 m gas-hydrate-bearing layer (porosity 51%, hydrate saturation 20%) at the base of gas hydrate stability 13.5 ka ago in the temperate marine environment would have disappeared by the present. In contrast, the same gas-hydrate-bearing layer underlying permafrost would persist until at least 4 ka after present, even with contemporary climate warming. These longer times for subpermafrost gas hydrate arise from thawing pore ice at the base of permafrost, at the expense of dissociation of the deeper gas hydrate. Overlying permafrost thus buffers the dissociation of underlying gas hydrate from climate surface warming.

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