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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Language: | English |
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Online Access: | https://eprints.whiterose.ac.uk/150943/ https://eprints.whiterose.ac.uk/150943/1/Cooper_et_al_2019_Geophysical_Research_Letters.pdf https://doi.org/10.1029/2018GL080620 |
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ftleedsuniv:oai:eprints.whiterose.ac.uk:150943 2023-05-15T16:27:13+02:00 Surface Expression of Basal and Englacial Features, Properties, and Processes of the Greenland Ice Sheet Cooper, M. A. Jordan, T. M. Siegert, M. J. Bamber, J. L. 2019-01-28 text https://eprints.whiterose.ac.uk/150943/ https://eprints.whiterose.ac.uk/150943/1/Cooper_et_al_2019_Geophysical_Research_Letters.pdf https://doi.org/10.1029/2018GL080620 en eng https://eprints.whiterose.ac.uk/150943/1/Cooper_et_al_2019_Geophysical_Research_Letters.pdf Cooper, M. A. orcid.org/0000-0002-4054-6783 , Jordan, T. M., Siegert, M. J. et al. (1 more author) (2019) Surface Expression of Basal and Englacial Features, Properties, and Processes of the Greenland Ice Sheet. Geophysical Research Letters. pp. 783-793. ISSN 0094-8276 cc_by CC-BY Article PeerReviewed 2019 ftleedsuniv https://doi.org/10.1029/2018GL080620 2023-01-30T22:22:25Z 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 White Rose Research Online (Universities of Leeds, Sheffield & York) Greenland Geophysical Research Letters 46 2 783 793 |
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Open Polar |
collection |
White Rose Research Online (Universities of Leeds, Sheffield & York) |
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ftleedsuniv |
language |
English |
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. |
format |
Article in Journal/Newspaper |
author |
Cooper, M. A. Jordan, T. M. Siegert, M. J. Bamber, J. L. |
spellingShingle |
Cooper, M. A. Jordan, T. M. Siegert, M. J. Bamber, J. L. Surface Expression of Basal and Englacial Features, Properties, and Processes of the Greenland Ice Sheet |
author_facet |
Cooper, M. A. Jordan, T. M. Siegert, M. J. Bamber, J. L. |
author_sort |
Cooper, M. A. |
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://eprints.whiterose.ac.uk/150943/ https://eprints.whiterose.ac.uk/150943/1/Cooper_et_al_2019_Geophysical_Research_Letters.pdf https://doi.org/10.1029/2018GL080620 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_relation |
https://eprints.whiterose.ac.uk/150943/1/Cooper_et_al_2019_Geophysical_Research_Letters.pdf Cooper, M. A. orcid.org/0000-0002-4054-6783 , Jordan, T. M., Siegert, M. J. et al. (1 more author) (2019) Surface Expression of Basal and Englacial Features, Properties, and Processes of the Greenland Ice Sheet. Geophysical Research Letters. pp. 783-793. ISSN 0094-8276 |
op_rights |
cc_by |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2018GL080620 |
container_title |
Geophysical Research Letters |
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46 |
container_issue |
2 |
container_start_page |
783 |
op_container_end_page |
793 |
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1766016333841956864 |