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:1810/347435 2024-02-04T10:00:35+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 2023-03-13T12:03:07Z application/pdf https://www.repository.cam.ac.uk/handle/1810/347435 https://doi.org/10.17863/CAM.94849 eng eng American Association for the Advancement of Science http://dx.doi.org/10.1126/sciadv.abq5180 Science Advances https://www.repository.cam.ac.uk/handle/1810/347435 doi:10.17863/CAM.94849 Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ essn: 2375-2548 nlmid: 101653440 37 Earth Sciences 3709 Physical Geography and Environmental Geoscience 3705 Geology 13 Climate Action Article 2023 ftunivcam https://doi.org/10.17863/CAM.94849 2024-01-11T23:21:03Z 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 Kujalleq ENVELOPE(-46.037,-46.037,60.719,60.719) Isunnguata Sermia ENVELOPE(-50.167,-50.167,67.183,67.183) |
institution |
Open Polar |
collection |
Apollo - University of Cambridge Repository |
op_collection_id |
ftunivcam |
language |
English |
topic |
37 Earth Sciences 3709 Physical Geography and Environmental Geoscience 3705 Geology 13 Climate Action |
spellingShingle |
37 Earth Sciences 3709 Physical Geography and Environmental Geoscience 3705 Geology 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 |
37 Earth Sciences 3709 Physical Geography and Environmental Geoscience 3705 Geology 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/1810/347435 https://doi.org/10.17863/CAM.94849 |
long_lat |
ENVELOPE(-46.037,-46.037,60.719,60.719) ENVELOPE(-50.167,-50.167,67.183,67.183) |
geographic |
Greenland Kujalleq Isunnguata Sermia |
geographic_facet |
Greenland Kujalleq Isunnguata Sermia |
genre |
glacier Greenland Ice Sheet Kujalleq Sermeq Kujalleq |
genre_facet |
glacier Greenland Ice Sheet Kujalleq Sermeq Kujalleq |
op_source |
essn: 2375-2548 nlmid: 101653440 |
op_relation |
https://www.repository.cam.ac.uk/handle/1810/347435 doi:10.17863/CAM.94849 |
op_rights |
Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.17863/CAM.94849 |
_version_ |
1789965939245056000 |