| Titre | Sharply increased mass loss from glaciers and ice caps in the Canadian Arctic Archipelago |
| Auteur | Gardner, A S; Moholdt, G; Wouters, B; Wolken, G J; Burgess, D O; Sharp, M J; Cogley, J G; Braun, C; Labine, C |
| Source | Nature (London) vol. 473, issue 7347, 2011 p. 357-360, https://doi.org/10.1038/nature10089 |
| Année | 2011 |
| Séries alt. | Secteur des sciences de la Terre, Contribution externe 20110161 |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1038/nature10089 |
| Media | papier; en ligne; numérique |
| Formats | pdf |
| Province | Nunavut |
| SNRC | 25; 26; 27; 37; 38; 48; 39; 49; 58; 59; 120; 340; 560 |
| Lat/Long OENS | -102.0000 -60.0000 84.0000 61.5000 |
| Sujets | variations du niveau de la mer; changements du niveau de la mer; glaciers; glace; climat arctique; fluctuations climatiques; géologie de l'environnement; 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)
Mountain glaciers and ice caps are contributing significantly to present rates of sea level rise and will continue to do so over the next century and beyond.
The Canadian Arctic Archipelago, located off the northwestern shore of Greenland, contains one-third of the global volume of land ice outside the ice sheets, but its contribution to sea-level change remains largely unknown. Here we show that the
Canadian Arctic Archipelago has recently lost 61±7 gigatonnes per year (Gt yr-1) of ice, contributing 0.17 ± 0.02 mm yr-1 to sea-level rise. Our estimates are of regional mass changes for the ice caps and glaciers of the Canadian Arctic Archipelago
referring to the years 2004 to 2009 and are based on three independent approaches: surface mass-budget modelling plus an estimate of ice discharge (SMB+D), repeat satellite laser altimetry (ICESat) and repeat satellite gravimetry (GRACE). All three
approaches show consistent and large mass-loss estimates. Between the periods 2004--2006 and 2007--2009, the rate of mass loss sharply increased from 31±8 Gt yr-1 to 92±12 Gt yr-1 in direct response to warmer summer temperatures, to which rates of
ice loss are highly sensitive (64±14 Gt yr-1 per 1K increase). The duration of the study is too short to establish a longterm trend, but for 2007--2009, the increase in the rate of mass loss makes the Canadian Arctic Archipelago the single largest
contributor to eustatic sea-level rise outside Greenland and Antarctica. |
| GEOSCAN ID | 289143 |
|
|