| Titre | Ice velocity changes on Penny Ice Cap, Baffin Island, since the 1950s |
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| Auteur | Schaffer, N; Copland, L; Zdanowicz, C |
| Source | Journal of Glaciology vol. 63, 240, 2017 p. 716-730, https://doi.org/10.1017/jog.2017.40  Accès ouvert |
| Année | 2017 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20182253 |
| Éditeur | Cambridge University Press (CUP) |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1017/jog.2017.40 |
| Media | papier; en ligne; numérique |
| Formats | pdf |
| Diffusé | 2017 07 26 |
| Résumé | (disponible en anglais seulement)
Predicting the velocity response of glaciers to increased surface melt is a major topic of ongoing research with significant implications for accurate sea-level
rise forecasting. In this study we use optical and radar satellite imagery as well as comparisons with historical ground measurements to produce a multi-decadal record of ice velocity variations on Penny Ice Cap, Baffin Island. Over the period
1985-2011, the six largest outlet glaciers on the ice cap decelerated by an average rate of 21 m a-1 over the 26 year period (0.81 m a-2), or 12% per decade. The change was not monotonic, however, as most glaciers accelerated until the 1990s, then
decelerated. A comparison of recent imagery with historical velocity measurements on Highway Glacier, on the southern part of Penny Ice Cap, shows that this glacier decelerated by 71% between 1953 and 2009-11, from 57 to 17 m a-1. The recent slowdown
of outlet glaciers has coincided with increases in mass loss, terminus retreat and an inferred reduction in basal sliding. Measured decelerations are greater than the total short-term variability measured from both seasonal and interannual
fluctuations, and support the hypothesis that glacier thinning and/or increased meltwater production promotes a long-term reduction in ice motion. © The Author(s) 2017. |
| GEOSCAN ID | 310824 |
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