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(Article of periodic en Anglais - 2010)

Document title

Thermal state of permafrost in North America : a contribution to the International Polar year

published at : Special Issue : The international polar year

Authors(s) and Affiliation(s)

SMITH S.L. (1) ; ROMANOVSKY V.E. (2) ; LEWKOWICZ A.G. (3) ; BURN C.R. (4) ; ALLARD M. (5) ; CLOW G.D. (6) ; YOSHIKAWA K. (2) ; THROOP J. (3) ;
(1) Geological Survey of Canada, Ottawa, CANADA
(2) Geophysical Inst., Univ. Alaska, Fairbanks, ETATS-UNIS
(3) Dep. of Geography, Univ., Ottawa, CANADA
(4) Dep. of Geography and Environmental Studies, Carleton Univ., Ottawa, CANADA
(5) Centre d'études nordiques, Univ. Laval, Sainte-Foy, CANADA
(6) United States Geological Survey, Colorado, Lakewood, ETATS-UNIS

Abstract

A snapshot of the thermal state of permafrost in northern North America during the International Polar Year (IPY) was developed using ground temperature data collected from 350 boreholes at various elevations within the Cordillera. In concert with regional air temperatures, permafrost has generally been warming across North America for the past several decades, as indicated by measurements from the western Arctic since the 1970s and from parts of eastern Canada since the early 1990s. The rates of ground warming have been variable, but are generally greater north of the treeline. Latent heat effects in the southern discontinuous zone dominate the permafrost thermal regime close to 0°C and allow permafrost to persist under a warming climate. Consequently, the spatial diversity of permafrost thermal conditions is decreasing over time

Source

Thematical fascicle

published at : Permafrost and periglacial processes / ISSN 1045-6740 / CODEN PEPPED

Editor : Wiley, Chichester - ROYAUME-UNI (1990)

Millesime : 2010, vol. 21, no 2 [pp. 117-135]

Bibliographic references : 55 ref.

Collation : fig., tabl.

Language

Anglais

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/ppp.690

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2010
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