| Titre | Extreme melt on Canada's Arctic ice caps in the 21st century |
| Auteur | Sharp, M; Burgess, D O; Cogley, J G; Ecclestone, M; Labine, C; Wolken, G J |
| Source | Geophysical Research Letters vol. 38, L11501, 2011., https://doi.org/10.1029/2011GL047381 |
| Année | 2011 |
| Séries alt. | Secteur des sciences de la Terre, Contribution externe 20110160 |
| Éditeur | American Geophysical Union |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1029/2011GL047381 |
| Media | papier; en ligne; numérique |
| Province | Nunavut |
| SNRC | 48G; 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 |
| Sujets | glace; glaciers; fluctuations climatiques; temperature; géologie de l'environnement; géologie des dépôts meubles/géomorphologie; Quaternaire |
| Illustrations | location maps |
| |
| Programme | Les 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 ID | 289142 |
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