Greenland ice sheet annual motion insensitive to spatial variations in subglacial hydraulic structure
Détails
Télécharger: Geophysical Research Letters - 2014 - Tedstone - Greenland ice sheet annual motion insensitive to spatial variations in.pdf (1124.99 [Ko])
Etat: Public
Version: Final published version
Licence: CC BY 4.0
Etat: Public
Version: Final published version
Licence: CC BY 4.0
ID Serval
serval:BIB_D2E1AD764429
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Greenland ice sheet annual motion insensitive to spatial variations in subglacial hydraulic structure
Périodique
Geophysical Research Letters
ISSN
0094-8276
1944-8007
1944-8007
Statut éditorial
Publié
Date de publication
28/12/2014
Peer-reviewed
Oui
Volume
41
Numéro
24
Pages
8910-8917
Langue
anglais
Résumé
We present ice velocities observed with global positioning systems and TerraSAR-X/TanDEM-X in a land-terminating region of the southwest Greenland ice sheet (GrIS) during the melt year 2012–2013, to examine the spatial pattern of seasonal and annual ice motion. We find that while spatial variability in the configuration of the subglacial drainage system controls ice motion at short timescales, this configuration has negligible impact on the spatial pattern of the proportion of annual motion which occurs during summer. While absolute annual velocities vary substantially, the proportional contribution of summer motion to annual motion does not. These observations suggest that in land-terminating margins of the GrIS, subglacial hydrology does not significantly influence spatial variations in net summer speedup. Furthermore, our findings imply that not every feature of the subglacial drainage system needs to be resolved in ice sheet models.
Mots-clé
Ice sheet dynamics, Ice sheet hydrology, Cryospheric remote sensing, Global Positioning Systems
Web of science
Site de l'éditeur
Open Access
Oui
Création de la notice
29/08/2024 10:03
Dernière modification de la notice
25/11/2024 17:01