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GEOREF RECORD

Factors influencing permafrost temperatures across tree line in the uplands east of the Mackenzie Delta, 2004-2010

Michael J. Palmer, C. R. Burn and S. V. Kokelj
Factors influencing permafrost temperatures across tree line in the uplands east of the Mackenzie Delta, 2004-2010 (in Fundamental and applied research on permafrost in Canada--Recherche fondamentale et appliquee sur le pergelisol au Canada, C. R. Burn (editor) and M. Allard (editor))
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre (August 2012) 49 (8): 877-894

Abstract

Air and near-surface ground temperatures, late-winter snow conditions, and characteristics of the vegetation cover and soil were measured across the forest-tundra transition in the uplands east of the Mackenzie Delta, Northwest Territories, in 2004-2010. Mean late-winter snow depth decreased northward from 73 cm in the subarctic boreal forest near Inuvik to 22 cm in low-shrub tundra. Annual near-surface ground temperatures decreased northward by 0.1-0.3 degrees C/km near the northern limit of trees, in association with an abrupt change in snow depth. The rate decreased to 0.01-0.06 degrees C/km in the tundra. The freezing season is twice as long as the thawing season in the region, so measured differences in the regional ground thermal regime were dominated by the contrast in winter surface conditions between forest and tundra.


ISSN: 0008-4077
EISSN: 1480-3313
Coden: CJESAP
Serial Title: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre
Serial Volume: 49
Serial Issue: 8
Title: Factors influencing permafrost temperatures across tree line in the uplands east of the Mackenzie Delta, 2004-2010
Title: Fundamental and applied research on permafrost in Canada--Recherche fondamentale et appliquee sur le pergelisol au Canada
Author(s): Palmer, Michael J.Burn, C. R.Kokelj, S. V.
Author(s): Burn, C. R.editor
Author(s): Allard, M.editor
Affiliation: Aboriginal Affairs and Northern Development Canada, Cumulative Impact Monitoring Program, Yellowknife, NT, Canada
Affiliation: Carleton University, Department of Geography and Environmental Studies, Ottawa, ON, Canada
Pages: 877-894
Published: 201208
Text Language: English
Summary Language: French
Publisher: National Research Council of Canada, Ottawa, ON, Canada
References: 43
Accession Number: 2012-094277
Categories: Geomorphology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Accessed on August 23, 2012; includes appendix
Illustration Description: illus. incl. 6 tables, sketch map
Source Medium: WWW
N67°49'60" - N69°40'00", W136°00'00" - W132°30'00"
Secondary Affiliation: Universite Laval, CAN, CanadaCarleton University, CAN, Canada
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 201249
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