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

Special Issue : The international polar year

Auteur(s) et Affiliation(s)

SMITH, S.L.
Geological Survey of Canada, Ottawa, Canada
ROMANOVSKY, V.E.
Geophysical Inst., Univ. Alaska, Fairbanks, Etats-Unis
LEWKOWICZ, A.G.
Dep. of Geography, Univ., Ottawa, Canada
BURN, C.R.
Dep. of Geography and Environmental Studies, Carleton Univ., Ottawa, Canada
ALLARD, M.
Centre d'études nordiques, Univ. Laval, Sainte-Foy, Canada
CLOW, G.D.
United States Geological Survey, Colorado, Lakewood, Etats-Unis
YOSHIKAWA, K.
Geophysical Inst., Univ. Alaska, Fairbanks, Etats-Unis
THROOP, J.
Dep. of Geography, Univ., Ottawa, Canada


Description :
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.


Type de document :
Article de monographie

Source :
Permafrost and periglacial processes, issn : 1045-6740, 2010, vol. 21, n°. 2, p. 117-135, nombre de pages : 19, Références bibliographiques : 55 ref.

Date :
2010

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley

Langue :
Anglais
Droits :
Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI)