Surface Expression of Basal and Englacial Features, Properties, and Processes of the Greenland Ice Sheet
Radar-sounding surveys measuring ice thickness in Greenland have enabled an increasingly ‘complete’ knowledge of basal topography and glaciological processes. Where such observations are spatially limited, bed elevation has been interpolated through mass conservation or kriging. Ordinary kriging fai...
Published in: | Geophysical Research Letters |
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Online Access: | https://hdl.handle.net/1983/1305f9d7-d16f-46d9-9fbd-d872df27d244 https://research-information.bris.ac.uk/en/publications/1305f9d7-d16f-46d9-9fbd-d872df27d244 https://doi.org/10.1029/2018GL080620 https://research-information.bris.ac.uk/ws/files/185253205/Cooper_et_al_2019_Geophysical_Research_Letters.pdf http://www.scopus.com/inward/record.url?scp=85060230266&partnerID=8YFLogxK |
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ftubristolcris:oai:research-information.bris.ac.uk:publications/1305f9d7-d16f-46d9-9fbd-d872df27d244 2024-05-19T07:41:01+00:00 Surface Expression of Basal and Englacial Features, Properties, and Processes of the Greenland Ice Sheet Cooper, Michael Jordan, Tom Siegert, Martin Bamber, Jonathan 2019-01-28 application/pdf https://hdl.handle.net/1983/1305f9d7-d16f-46d9-9fbd-d872df27d244 https://research-information.bris.ac.uk/en/publications/1305f9d7-d16f-46d9-9fbd-d872df27d244 https://doi.org/10.1029/2018GL080620 https://research-information.bris.ac.uk/ws/files/185253205/Cooper_et_al_2019_Geophysical_Research_Letters.pdf http://www.scopus.com/inward/record.url?scp=85060230266&partnerID=8YFLogxK eng eng https://research-information.bris.ac.uk/en/publications/1305f9d7-d16f-46d9-9fbd-d872df27d244 info:eu-repo/semantics/openAccess Cooper , M , Jordan , T , Siegert , M & Bamber , J 2019 , ' Surface Expression of Basal and Englacial Features, Properties, and Processes of the Greenland Ice Sheet ' , Geophysical Research Letters , vol. 46 , no. 2 , pp. 783-793 . https://doi.org/10.1029/2018GL080620 Greenland ice sheet subglacial subsurface englacial decoupling basal units Greenland article 2019 ftubristolcris https://doi.org/10.1029/2018GL080620 2024-04-30T23:51:18Z Radar-sounding surveys measuring ice thickness in Greenland have enabled an increasingly ‘complete’ knowledge of basal topography and glaciological processes. Where such observations are spatially limited, bed elevation has been interpolated through mass conservation or kriging. Ordinary kriging fails to resolve anisotropy in bed geometry, however, leaving complex topography misrepresented in elevation models of the ice-sheet bed. Here, we demonstrate the potential of new high-resolution (≤ 5 m) surface topography data (ArcticDEM) to provide enhanced insight into basal and englacial geometry and processes. Notable surface features, quantified via residual surface elevation (RSE), are observed coincident with documented subglacial channels, and new, smaller-scale tributaries (< 2,000 m in width) and valley-like structures are clearly identified. RSE also allows the extent of basal ice units to be mapped, which in conjunction with radar data indicate that they act as ‘false bottoms’, likely due to a rheological contrast in the ice column Article in Journal/Newspaper Greenland Ice Sheet University of Bristol: Bristol Research Geophysical Research Letters 46 2 783 793 |
institution |
Open Polar |
collection |
University of Bristol: Bristol Research |
op_collection_id |
ftubristolcris |
language |
English |
topic |
Greenland ice sheet subglacial subsurface englacial decoupling basal units Greenland |
spellingShingle |
Greenland ice sheet subglacial subsurface englacial decoupling basal units Greenland Cooper, Michael Jordan, Tom Siegert, Martin Bamber, Jonathan Surface Expression of Basal and Englacial Features, Properties, and Processes of the Greenland Ice Sheet |
topic_facet |
Greenland ice sheet subglacial subsurface englacial decoupling basal units Greenland |
description |
Radar-sounding surveys measuring ice thickness in Greenland have enabled an increasingly ‘complete’ knowledge of basal topography and glaciological processes. Where such observations are spatially limited, bed elevation has been interpolated through mass conservation or kriging. Ordinary kriging fails to resolve anisotropy in bed geometry, however, leaving complex topography misrepresented in elevation models of the ice-sheet bed. Here, we demonstrate the potential of new high-resolution (≤ 5 m) surface topography data (ArcticDEM) to provide enhanced insight into basal and englacial geometry and processes. Notable surface features, quantified via residual surface elevation (RSE), are observed coincident with documented subglacial channels, and new, smaller-scale tributaries (< 2,000 m in width) and valley-like structures are clearly identified. RSE also allows the extent of basal ice units to be mapped, which in conjunction with radar data indicate that they act as ‘false bottoms’, likely due to a rheological contrast in the ice column |
format |
Article in Journal/Newspaper |
author |
Cooper, Michael Jordan, Tom Siegert, Martin Bamber, Jonathan |
author_facet |
Cooper, Michael Jordan, Tom Siegert, Martin Bamber, Jonathan |
author_sort |
Cooper, Michael |
title |
Surface Expression of Basal and Englacial Features, Properties, and Processes of the Greenland Ice Sheet |
title_short |
Surface Expression of Basal and Englacial Features, Properties, and Processes of the Greenland Ice Sheet |
title_full |
Surface Expression of Basal and Englacial Features, Properties, and Processes of the Greenland Ice Sheet |
title_fullStr |
Surface Expression of Basal and Englacial Features, Properties, and Processes of the Greenland Ice Sheet |
title_full_unstemmed |
Surface Expression of Basal and Englacial Features, Properties, and Processes of the Greenland Ice Sheet |
title_sort |
surface expression of basal and englacial features, properties, and processes of the greenland ice sheet |
publishDate |
2019 |
url |
https://hdl.handle.net/1983/1305f9d7-d16f-46d9-9fbd-d872df27d244 https://research-information.bris.ac.uk/en/publications/1305f9d7-d16f-46d9-9fbd-d872df27d244 https://doi.org/10.1029/2018GL080620 https://research-information.bris.ac.uk/ws/files/185253205/Cooper_et_al_2019_Geophysical_Research_Letters.pdf http://www.scopus.com/inward/record.url?scp=85060230266&partnerID=8YFLogxK |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
Cooper , M , Jordan , T , Siegert , M & Bamber , J 2019 , ' Surface Expression of Basal and Englacial Features, Properties, and Processes of the Greenland Ice Sheet ' , Geophysical Research Letters , vol. 46 , no. 2 , pp. 783-793 . https://doi.org/10.1029/2018GL080620 |
op_relation |
https://research-information.bris.ac.uk/en/publications/1305f9d7-d16f-46d9-9fbd-d872df27d244 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2018GL080620 |
container_title |
Geophysical Research Letters |
container_volume |
46 |
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2 |
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783 |
op_container_end_page |
793 |
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