Complex motion of Greenland Ice Sheet outlet glaciers with basal temperate ice.

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State: Public
Version: Final published version
License: CC BY-NC 4.0
Serval ID
serval:BIB_41A66AA5C6FE
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Complex motion of Greenland Ice Sheet outlet glaciers with basal temperate ice.
Journal
Science advances
Author(s)
Law R., Christoffersen P., MacKie E., Cook S., Haseloff M., Gagliardini O.
ISSN
2375-2548 (Electronic)
ISSN-L
2375-2548
Publication state
Published
Issued date
10/02/2023
Peer-reviewed
Oui
Volume
9
Number
6
Pages
eabq5180
Language
english
Notes
Publication types: Journal Article
Publication Status: ppublish
Abstract
Uncertainty associated with ice sheet motion plagues sea level rise predictions. Much of this uncertainty arises from imperfect representations of physical processes including basal slip and internal ice deformation, with ice sheet models largely incapable of reproducing borehole-based observations. Here, we model isolated three-dimensional domains from fast-moving (Sermeq Kujalleq/Store Glacier) and slow-moving (Isunnguata Sermia) ice sheet settings in Greenland. By incorporating realistic geostatistically simulated topography, we show that a spatially highly variable layer of temperate ice (much softer ice at the pressure-melting point) forms naturally in both settings, alongside ice motion patterns which diverge substantially from those obtained using smoothly varying BedMachine topography. Temperate ice is vertically extensive (>100 meters) in deep troughs but thins notably (<5 meters) over bedrock highs, with basal slip rates reaching >90 or <5% of surface velocity dependent on topography and temperate layer thickness. Developing parameterizations of the net effect of this complex motion can improve the realism of predictive ice sheet models.
Pubmed
Open Access
Yes
Create date
13/03/2023 17:05
Last modification date
20/04/2023 6:10
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