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TitleClimate and ground temperature relations at sites across the continuous and discontinuous permafrost zones, northern Canada
AuthorThroop, J; Lewkowicz, A G; Smith, S L
SourceFundamental and applied research on permafrost in Canada; Canadian Journal of Earth Sciences vol. 49, 2012 p. 1-12, Open Access logo Open Access
Alt SeriesEarth Sciences Sector, Contribution Series 20110128
PublisherCanadian Science Publishing
Mediapaper; on-line; digital
File formatpdf
ProvinceNorthwest Territories; Nunavut; Yukon
NTS25N/10; 66A/08; 95H/14; 95O/11; 120E/05; 116C/02; 115P/16
AreaIqaluit; Alert; Baker Lake; Wrigley; Table Mountain; Wolf Creek; Red Creek; Alpine Burwash; Sixty Mile; Fort Simpson
Lat/Long WENS-69.0000 -68.5000 63.7500 63.5000
Lat/Long WENS-96.5000 -96.0000 64.5000 64.2500
Lat/Long WENS-120.5000 -120.5000 63.0000 62.7500
Lat/Long WENS-123.5000 -123.0000 63.7500 63.5000
Lat/Long WENS-63.5000 -63.0000 82.5000 82.2500
Lat/Long WENS-140.5000 -140.5000 64.2500 64.0000
Lat/Long WENS-136.5000 -136.0000 64.0000 63.7500
Subjectssurficial geology/geomorphology; environmental geology; Nature and Environment; permafrost; freezing ground; ground ice; ground temperatures; climate, arctic; terrain sensitivity; climate change
Illustrationslocation maps; plots; photographs; tables
AbstractClimate - ground temperature relations are examined under a range of conditions for 10 sites across northern Canada. The sites are located between 60°N and 83°N and at elevations of 40 to 1840 m above sea level. They encompass various environmental and climatic conditions, with permafrost temperatures that range from just below 0 to -15 °C. The substrates range from bedrock to fine-grained sediment with high ice content, and vegetation types include coniferous forests in the Mackenzie Valley, shrub tundra at high elevation in the southern Yukon Territory, and polar desert in the High Arctic. Permafrost conditions at all of these sites are determined primarily by air temperature, followed by snow and substrate conditions. The apparent thermal diffusivity is relatively high at colder sites and in bedrock and is lower at sites in sediment with high ice content. Snow has a greater influence on air - ground temperature relations at sites where mean annual air temperatures and active-layer moisture contents are relatively high, leading to physically significant latent heat effects and a slower freeze-back of the active layer.

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