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TitlePotential changes in permafrost distribution in the Fort Simpson and Norman Wells regions
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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorWright, J F; Smith, M W; Taylor, A E
SourceThe physical environment of the Mackenzie Valley, Northwest Territories: a base line for the assessment of environmental change; by Dyke, L D (ed.); Brooks, G RORCID logo (ed.); Geological Survey of Canada, Bulletin 547, 2000 p. 197-207; 1 CD-ROM, Open Access logo Open Access
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PublisherNatural Resources Canada
Mediapaper; CD-ROM; digital; on-line
RelatedThis publication is contained in The physical environment of the Mackenzie Valley, Northwest Territories: a base line for the assessment of environmental change
File formatbmp; pdf (Adobe Acrobat Reader v.6.0 is included / est fourni); txt; pdf
ProvinceNorthwest Territories
NTS95H/11; 95H/12; 95H/13; 95H/14; 96E/01; 96E/02; 96E/07; 96E/08
AreaMackenzie Valley; Fort Simpson; Norman Wells
Lat/Long WENS-122.0000 -121.0000 63.0000 62.5000
Lat/Long WENS-127.0000 -126.0000 67.5000 67.0000
Subjectssedimentology; surficial geology/geomorphology; climatic fluctuations; permafrost; ground ice; geothermal surveys; ground temperatures; precipitation; snow; thermal conductivity; vegetation; Quaternary
Illustrationssketch maps; flow charts; plots; graphs
Released2000 12 01
AbstractModelling that predicts permafrost distribution and thickness in equilibrium with a given mean annual air temperature is applied to the Norman Wells and Fort Simpson regions. The model predicts the likelihood of permafrost, based on values of thermal conductivity for the various surficial materials in each study area and a factor which describes the insulating property of ground-surface vegetation and snow cover. Estimates of permafrost thickness are obtained for various combinations of terrain characteristics. Using maps of vegetation and surficial geology, these combinations can be compiled for each study area and used to map both permafrost thickness and extent, using a geographic information system. This technique predicts that, under an increase in mean annual air temperature of 2°C, permafrost extent decreases slightly and thickness decreases markedly for the Norman Wells area. For the same temperature increase at Fort Simpson, permafrost almost completely disappears.


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