| Titre | Recent volume and mass changes of Penny Ice Cap (Baffin Island, Nunavut) determined using repeat airborne laser altimetry |
| Auteur | Schaffer, N; Zdanowicz, C; Copland, L; Burgess, D O |
| Source | American Geophysical Union, Fall Meeting 2011, abstracts; 2011AGUFM.C13A0722S, 2011 p. 1 (Accès ouvert) |
| Liens | Online - En ligne
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| Année | 2011 |
| Séries alt. | Secteur des sciences de la Terre, Contribution externe 20110336 |
| Réunion | American Geophysical Union, Fall Meeting 2011; San Francisco, CA; US; décembre 5-9, 2011 |
| Document | site Web |
| Lang. | anglais |
| Media | en ligne; numérique |
| Formats | html; pdf |
| Sujets | Nature et environnement |
| Programme | Géosciences de changements climatiques, 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 |
| Diffusé | 2011 12 01 |
| Résumé | (disponible en anglais seulement)
Recent observations of accelerated glacier wastage in Greenland and Alaska have prompted reassessments of mass balance trends and volume changes on Canadian
Arctic glaciers and ice caps. While long surface mass balance measurements are available from ice caps of the Queen Elizabeth Islands (e.g., Axel Heiberg and Devon islands), no such records exist for Baffin Island glaciers. In the absence of such
data, air- and space-borne measurements can be used in combination with ice core data and in-situ ground penetrating radar surveys to evaluate historical and recent trends in ice cover changes. Here, we use repeat laser airborne altimetry surveys
conducted in 2000 and 2005 to estimate current volume and mass reduction rates of Penny Ice Cap, the southernmost large ice cap on Baffin Island (~66°N). This work builds on previous surveys for the period 1995-2000 [Abdalati et al. (2004) JGR 109:
F04007.] Surface elevation changes along altimetry lines are extrapolated to the entire ice cap using a digital elevation model (DEM). Changes in areal extent of the ice cap are constrained using satellite imagery (e.g. Landsat). From these data and
using firn density profiles measured in cores, we estimate the total mass wastage of the ice cap and its contribution to sea level rise. |
| GEOSCAN ID | 289831 |
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