Complex motion of Greenland Ice Sheet outlet glaciers with basal temperate ice
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....
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American Association for the Advancement of Science
2023
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ftunivcam:oai:www.repository.cam.ac.uk:1810/346502 2024-01-14T10:07:02+01:00 Complex motion of Greenland Ice Sheet outlet glaciers with basal temperate ice Law, Robert Christoffersen, Poul MacKie, Emma Cook, Samuel Haseloff, Marianne Gagliardini, Olivier 2023-01-16T13:53:48Z application/pdf https://www.repository.cam.ac.uk/handle/1810/346502 https://doi.org/10.17863/CAM.93917 eng eng American Association for the Advancement of Science Department of Geography Science Advances https://doi.org/10.17863/CAM.88971 https://www.repository.cam.ac.uk/handle/1810/346502 doi:10.17863/CAM.93917 Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ 13 Climate Action Article 2023 ftunivcam https://doi.org/10.17863/CAM.9391710.17863/CAM.88971 2023-12-21T23:29:09Z 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 3D 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 m) in deep troughs, but thins notably (<5 m) 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 Article in Journal/Newspaper glacier Greenland Ice Sheet Kujalleq Sermeq Kujalleq Apollo - University of Cambridge Repository Greenland Isunnguata Sermia ENVELOPE(-50.167,-50.167,67.183,67.183) Kujalleq ENVELOPE(-46.037,-46.037,60.719,60.719) |
institution |
Open Polar |
collection |
Apollo - University of Cambridge Repository |
op_collection_id |
ftunivcam |
language |
English |
topic |
13 Climate Action |
spellingShingle |
13 Climate Action Law, Robert Christoffersen, Poul MacKie, Emma Cook, Samuel Haseloff, Marianne Gagliardini, Olivier Complex motion of Greenland Ice Sheet outlet glaciers with basal temperate ice |
topic_facet |
13 Climate Action |
description |
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 3D 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 m) in deep troughs, but thins notably (<5 m) 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 |
format |
Article in Journal/Newspaper |
author |
Law, Robert Christoffersen, Poul MacKie, Emma Cook, Samuel Haseloff, Marianne Gagliardini, Olivier |
author_facet |
Law, Robert Christoffersen, Poul MacKie, Emma Cook, Samuel Haseloff, Marianne Gagliardini, Olivier |
author_sort |
Law, Robert |
title |
Complex motion of Greenland Ice Sheet outlet glaciers with basal temperate ice |
title_short |
Complex motion of Greenland Ice Sheet outlet glaciers with basal temperate ice |
title_full |
Complex motion of Greenland Ice Sheet outlet glaciers with basal temperate ice |
title_fullStr |
Complex motion of Greenland Ice Sheet outlet glaciers with basal temperate ice |
title_full_unstemmed |
Complex motion of Greenland Ice Sheet outlet glaciers with basal temperate ice |
title_sort |
complex motion of greenland ice sheet outlet glaciers with basal temperate ice |
publisher |
American Association for the Advancement of Science |
publishDate |
2023 |
url |
https://www.repository.cam.ac.uk/handle/1810/346502 https://doi.org/10.17863/CAM.93917 |
long_lat |
ENVELOPE(-50.167,-50.167,67.183,67.183) ENVELOPE(-46.037,-46.037,60.719,60.719) |
geographic |
Greenland Isunnguata Sermia Kujalleq |
geographic_facet |
Greenland Isunnguata Sermia Kujalleq |
genre |
glacier Greenland Ice Sheet Kujalleq Sermeq Kujalleq |
genre_facet |
glacier Greenland Ice Sheet Kujalleq Sermeq Kujalleq |
op_relation |
https://doi.org/10.17863/CAM.88971 https://www.repository.cam.ac.uk/handle/1810/346502 doi:10.17863/CAM.93917 |
op_rights |
Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.17863/CAM.9391710.17863/CAM.88971 |
_version_ |
1788061445819203584 |