Bed topography and subglacial landforms in the onset region of the Northeast Greenland Ice Stream
The Northeast Greenland Ice Stream (NEGIS) is an important dynamic component for the total mass balance of the Greenland ice sheet, as it reaches up to the central divide and drains 12% of the ice sheet. The geometric boundary conditions and in particular the nature of the subglacial bed of the NEGI...
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Cambridge University Press
2020
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Online Access: | https://publikationen.bibliothek.kit.edu/1000117782 https://publikationen.bibliothek.kit.edu/1000117782/64177223 https://doi.org/10.5445/IR/1000117782 |
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ftubkarlsruhe:oai:EVASTAR-Karlsruhe.de:1000117782 2023-05-15T13:29:40+02:00 Bed topography and subglacial landforms in the onset region of the Northeast Greenland Ice Stream Franke, Steven Jansen, Daniela Binder, Tobias Dörr, Nils Helm, Veit Paden, John Steinhage, Daniel Eisen, Olaf 2020-03-18 application/pdf https://publikationen.bibliothek.kit.edu/1000117782 https://publikationen.bibliothek.kit.edu/1000117782/64177223 https://doi.org/10.5445/IR/1000117782 eng eng Cambridge University Press info:eu-repo/semantics/altIdentifier/doi/10.1017/aog.2020.12 info:eu-repo/semantics/altIdentifier/issn/0260-3055 info:eu-repo/semantics/altIdentifier/issn/1727-5644 https://publikationen.bibliothek.kit.edu/1000117782 https://publikationen.bibliothek.kit.edu/1000117782/64177223 https://doi.org/10.5445/IR/1000117782 https://creativecommons.org/licenses/by/4.0/deed.de info:eu-repo/semantics/openAccess CC-BY Annals of Glaciology, 61 (81), 143-153 ISSN: 0260-3055, 1727-5644 Glacial geomorphology glacier flow ice streams processes and landforms ofglacial erosion radio-echo sounding ddc:550 Earth sciences info:eu-repo/classification/ddc/550 doc-type:article Text info:eu-repo/semantics/article article info:eu-repo/semantics/publishedVersion 2020 ftubkarlsruhe https://doi.org/10.5445/IR/1000117782 https://doi.org/10.1017/aog.2020.12 2022-03-23T17:25:40Z The Northeast Greenland Ice Stream (NEGIS) is an important dynamic component for the total mass balance of the Greenland ice sheet, as it reaches up to the central divide and drains 12% of the ice sheet. The geometric boundary conditions and in particular the nature of the subglacial bed of the NEGIS are essential to understand its ice flow dynamics. We present a record of more than 8000 km of radar survey lines of multi-channel, ultra-wideband radio echo sounding data covering an area of 24 000 km2, centered on the drill site for the East Greenland Ice-core Project (EGRIP), in the upper part of the NEGIS catchment. Our data yield a new detailed model of ice-thickness distribution and basal topography in the region. The enhanced resolution of our bed topography model shows features which we interpret to be caused by erosional activity, potentially over several glacial–interglacial cycles. Off-nadir reflections from the ice–bed interface in the center of the ice stream indicate a streamlined bed with elongated subglacial landforms. Our new bed topography model will help to improve the basal boundary conditions of NEGIS prescribed for ice flow models and thus foster an improved understanding of the ice-dynamic ... Article in Journal/Newspaper Annals of Glaciology East Greenland East Greenland Ice-core Project glacier Greenland Greenland ice core Greenland Ice core Project ice core Ice Sheet KITopen (Karlsruhe Institute of Technologie) Greenland |
institution |
Open Polar |
collection |
KITopen (Karlsruhe Institute of Technologie) |
op_collection_id |
ftubkarlsruhe |
language |
English |
topic |
Glacial geomorphology glacier flow ice streams processes and landforms ofglacial erosion radio-echo sounding ddc:550 Earth sciences info:eu-repo/classification/ddc/550 |
spellingShingle |
Glacial geomorphology glacier flow ice streams processes and landforms ofglacial erosion radio-echo sounding ddc:550 Earth sciences info:eu-repo/classification/ddc/550 Franke, Steven Jansen, Daniela Binder, Tobias Dörr, Nils Helm, Veit Paden, John Steinhage, Daniel Eisen, Olaf Bed topography and subglacial landforms in the onset region of the Northeast Greenland Ice Stream |
topic_facet |
Glacial geomorphology glacier flow ice streams processes and landforms ofglacial erosion radio-echo sounding ddc:550 Earth sciences info:eu-repo/classification/ddc/550 |
description |
The Northeast Greenland Ice Stream (NEGIS) is an important dynamic component for the total mass balance of the Greenland ice sheet, as it reaches up to the central divide and drains 12% of the ice sheet. The geometric boundary conditions and in particular the nature of the subglacial bed of the NEGIS are essential to understand its ice flow dynamics. We present a record of more than 8000 km of radar survey lines of multi-channel, ultra-wideband radio echo sounding data covering an area of 24 000 km2, centered on the drill site for the East Greenland Ice-core Project (EGRIP), in the upper part of the NEGIS catchment. Our data yield a new detailed model of ice-thickness distribution and basal topography in the region. The enhanced resolution of our bed topography model shows features which we interpret to be caused by erosional activity, potentially over several glacial–interglacial cycles. Off-nadir reflections from the ice–bed interface in the center of the ice stream indicate a streamlined bed with elongated subglacial landforms. Our new bed topography model will help to improve the basal boundary conditions of NEGIS prescribed for ice flow models and thus foster an improved understanding of the ice-dynamic ... |
format |
Article in Journal/Newspaper |
author |
Franke, Steven Jansen, Daniela Binder, Tobias Dörr, Nils Helm, Veit Paden, John Steinhage, Daniel Eisen, Olaf |
author_facet |
Franke, Steven Jansen, Daniela Binder, Tobias Dörr, Nils Helm, Veit Paden, John Steinhage, Daniel Eisen, Olaf |
author_sort |
Franke, Steven |
title |
Bed topography and subglacial landforms in the onset region of the Northeast Greenland Ice Stream |
title_short |
Bed topography and subglacial landforms in the onset region of the Northeast Greenland Ice Stream |
title_full |
Bed topography and subglacial landforms in the onset region of the Northeast Greenland Ice Stream |
title_fullStr |
Bed topography and subglacial landforms in the onset region of the Northeast Greenland Ice Stream |
title_full_unstemmed |
Bed topography and subglacial landforms in the onset region of the Northeast Greenland Ice Stream |
title_sort |
bed topography and subglacial landforms in the onset region of the northeast greenland ice stream |
publisher |
Cambridge University Press |
publishDate |
2020 |
url |
https://publikationen.bibliothek.kit.edu/1000117782 https://publikationen.bibliothek.kit.edu/1000117782/64177223 https://doi.org/10.5445/IR/1000117782 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Annals of Glaciology East Greenland East Greenland Ice-core Project glacier Greenland Greenland ice core Greenland Ice core Project ice core Ice Sheet |
genre_facet |
Annals of Glaciology East Greenland East Greenland Ice-core Project glacier Greenland Greenland ice core Greenland Ice core Project ice core Ice Sheet |
op_source |
Annals of Glaciology, 61 (81), 143-153 ISSN: 0260-3055, 1727-5644 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1017/aog.2020.12 info:eu-repo/semantics/altIdentifier/issn/0260-3055 info:eu-repo/semantics/altIdentifier/issn/1727-5644 https://publikationen.bibliothek.kit.edu/1000117782 https://publikationen.bibliothek.kit.edu/1000117782/64177223 https://doi.org/10.5445/IR/1000117782 |
op_rights |
https://creativecommons.org/licenses/by/4.0/deed.de info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5445/IR/1000117782 https://doi.org/10.1017/aog.2020.12 |
_version_ |
1766001915174322176 |