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Physical and ecological changes associated with warming permafrost and thermokarst in Interior Alaska

Auteur(s) et Affiliation(s)

OSTERKAMP, T.E.
Geophysical Inst., Univ. Alaska, Fairbanks, Etats-Unis
JORGENSON, M.T.
ABR, Inc, Alaska, Fairbanks, Etats-Unis
SCHUUR, E.A.G.
Dep. of Botany, Univ. of Florida, Gainesville, Etats-Unis
SHUR, Y.L.
Dep. of Civil and Environmental Engineering, Univ. of Alaska, Fairbanks, Etats-Unis
KANEVSKIY, M.Z.
Inst. of Northern Engineering, Univ. of Alaska, Fairbanks, Etats-Unis
VOGEL, J.G.
Dep. of Botany, Univ. of Florida, Gainesville, Etats-Unis
TUMSKOY, V.E.
Dep. of Geology,State Univ., Moscow, Russie, Federation de


Description :
Observations and measurements were made of physical and ecological changes that have occurred since 1985 at a tundra site near Healy, Alaska. Air temperatures decreased (1985 through 1999) while permafrost warmed and thawed creating thermokarst terrain, probably as a result of increased snow depths. Field and remote-sensing measurements of these changes allowed to assess the interactions of air temperatures and snow on permafrost thermal regimes, the consequences of increasing permafrost temperatures and ground-ice distribution on active-layer dynamics and thermokarst, and the impacts of thermokarst terrain on water redistribution, peat accumulation and shifting vegetation composition. The results provide insights into the processes, dynamics, direction and magnitude of the changes.


Type de document :
Article de périodique

Source :
Permafrost and periglacial processes, issn : 1045-6740, 2009, vol. 20, n°. 3, p. 235-256, nombre de pages : 22, Références bibliographiques : 1,5 p.

Date :
2009

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

Langue :
Anglais
Droits :
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