Permafrost - distribution and relation to environmental factors in the Hudson Bay lowland

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Pages3568; # of pages: 34
SubjectPermafrost; Soils; landforms; cold regions; peat
AbstractThe Hudson Bay Lowland lies mostly in the permafrost region of Canada. The distribution of permafrost varies from discontinuous in the southeast, north of the 30 degree F mean annual air isotherm, to continuous in the northwest, between the 25 degree F and 20 degree F mean annual air isotherms. The active layer varies from 1 to 3 feet, and permafrost ranges in thickness from a few inches at the southern limit to 200 feet in the continuous zone at Churchill. In the discontinuous zone, permafrost is found in peat plateaus and palsas which are prevalent, but it does not occur in intervening wet depressions nor in beach ridges or river banks. Permafrost exists everywhere beneath the land surface in the continuous zone which forms a narrow strip along the Hudson Bay coast. The most distinctive permafrost features are palsas of varying size to elevated peat plateaus exceeding 10 feet in height covering several acres. They form very distinctive air photo patterns and their origin appears related to thin snow cover.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC number13574
NPARC number20373966
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Record identifierde2095a3-557b-4bd5-8474-5a00f2a398b6
Record created2012-07-23
Record modified2016-05-09
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