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...
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American Geophysical Union
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Online Access: | http://hdl.handle.net/10044/1/66956 https://doi.org/10.1029/2018GL080620 |
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ftimperialcol:oai:spiral.imperial.ac.uk:10044/1/66956 2023-05-15T16:27:28+02:00 Surface expression of basal and englacial features, properties, and processes of the Greenland Ice Sheet Cooper, M Jordan, T Siegert, M Bamber, J Natural Environment Research Council (NERC) Natural Environment Research Council (NERC) 2019-01-05 http://hdl.handle.net/10044/1/66956 https://doi.org/10.1029/2018GL080620 unknown American Geophysical Union Geophysical Research Letters ©2019 The Authors. This is an open access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited. CC-BY 793 783 MD Multidisciplinary Meteorology & Atmospheric Sciences Journal Article 2019 ftimperialcol https://doi.org/10.1029/2018GL080620 2019-02-28T23:39:49Z 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, are observed coincident with documented subglacial channels, and new, smaller‐scale tributaries (<2,000 m in width) and valley‐like structures are clearly identified. Residual surface elevation 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 Imperial College London: Spiral Greenland Geophysical Research Letters 46 2 783 793 |
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Open Polar |
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Imperial College London: Spiral |
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ftimperialcol |
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unknown |
topic |
MD Multidisciplinary Meteorology & Atmospheric Sciences |
spellingShingle |
MD Multidisciplinary Meteorology & Atmospheric Sciences Cooper, M Jordan, T Siegert, M Bamber, J Surface expression of basal and englacial features, properties, and processes of the Greenland Ice Sheet |
topic_facet |
MD Multidisciplinary Meteorology & Atmospheric Sciences |
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, are observed coincident with documented subglacial channels, and new, smaller‐scale tributaries (<2,000 m in width) and valley‐like structures are clearly identified. Residual surface elevation 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. |
author2 |
Natural Environment Research Council (NERC) Natural Environment Research Council (NERC) |
format |
Article in Journal/Newspaper |
author |
Cooper, M Jordan, T Siegert, M Bamber, J |
author_facet |
Cooper, M Jordan, T Siegert, M Bamber, J |
author_sort |
Cooper, M |
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 |
publisher |
American Geophysical Union |
publishDate |
2019 |
url |
http://hdl.handle.net/10044/1/66956 https://doi.org/10.1029/2018GL080620 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
793 783 |
op_relation |
Geophysical Research Letters |
op_rights |
©2019 The Authors. This is an open access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2018GL080620 |
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Geophysical Research Letters |
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46 |
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2 |
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783 |
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793 |
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1766016643161391104 |