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TitreExtreme melt on Canada's Arctic ice caps in the 21st century
AuteurSharp, M; Burgess, D O; Cogley, J G; Ecclestone, M; Labine, C; Wolken, G J
SourceGeophysical Research Letters vol. 38, L11501, 2011., https://doi.org/10.1029/2011GL047381
Année2011
Séries alt.Secteur des sciences de la Terre, Contribution externe 20110160
ÉditeurAmerican Geophysical Union
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1029/2011GL047381
Mediapapier; en ligne; numérique
ProvinceNunavut
SNRC48G; 48H; 58G; 58H; 49; 59; 68G; 68H; 69; 78G; 78H; 79; 88H; 89; 120; 340; 560A
Lat/Long OENS-116.0000 -60.0000 83.0000 75.0000
Sujetsglace; glaciers; fluctuations climatiques; temperature; géologie de l'environnement; géologie des dépôts meubles/géomorphologie; Quaternaire
Illustrationslocation maps
ProgrammeLes sciences de la Terre à l'appui de la caractérisation, à l'échelle nationale, des impacts des changements climatiques sur la masse continentale canadienne, Géosciences de changements climatiques
Résumé(disponible en anglais seulement)
Canada's Queen Elizabeth Islands contain ~14% of
Earth's glacier and ice cap area. Snow accumulation on these
glaciers is low and varies little from year to year. Changes
in their surface mass balance are driven largely by changes
in summer air temperatures, surface melting and runoff.
Relative to 2000-2004, strong summer warming since 2005
(1.1 to 1.6°C at 700 hPa) has increased summer mean ice
surface temperatures and melt season length on the major
ice caps in this region by 0.8 to 2.2°C and 4.7 to 11.9 d
respectively. 30-48% of the total mass lost from 4 monitored
glaciers since 1963 has occurred since 2005. The mean rate
of mass loss from these 4 glaciers between 2005 and 2009
(-493 kg m-2 a-1) was nearly 5 times greater than the 1963-
2004 average. In 2007 and 2008, it was 7 times greater
(-698 kg m-2 a-1). These changes are associated with a
summer atmospheric circulation configuration that favors
strong heat advection into the Queen Elizabeth Islands from
the northwest Atlantic, where sea surface temperatures have
been anomalously high.
GEOSCAN ID289142