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...
Published in: | Annals of Glaciology |
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INT GLACIOL SOC
2020
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Online Access: | https://epic.awi.de/id/eprint/51448/ https://epic.awi.de/id/eprint/51448/1/bed_topography_and_subglacial_landforms_in_the_onset_region_of_the_northeast_greenland_ice_stream.pdf https://hdl.handle.net/10013/epic.b1caa2bd-9f06-4fef-8438-f165a2c84e39 https://hdl.handle.net/ |
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ftawi:oai:epic.awi.de:51448 2023-05-15T13:29:48+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://epic.awi.de/id/eprint/51448/ https://epic.awi.de/id/eprint/51448/1/bed_topography_and_subglacial_landforms_in_the_onset_region_of_the_northeast_greenland_ice_stream.pdf https://hdl.handle.net/10013/epic.b1caa2bd-9f06-4fef-8438-f165a2c84e39 https://hdl.handle.net/ unknown INT GLACIOL SOC https://epic.awi.de/id/eprint/51448/1/bed_topography_and_subglacial_landforms_in_the_onset_region_of_the_northeast_greenland_ice_stream.pdf https://hdl.handle.net/ Franke, S. orcid:0000-0001-8462-4379 , Jansen, D. orcid:0000-0002-4412-5820 , Binder, T. , Dörr, N. orcid:0000-0002-7594-7886 , Helm, V. orcid:0000-0001-7788-9328 , Paden, J. , Steinhage, D. orcid:0000-0003-4737-9751 and Eisen, O. orcid:0000-0002-6380-962X (2020) Bed topography and subglacial landforms in the onset region of the Northeast Greenland Ice Stream , Annals of Glaciology, 61 (81), pp. 143-153 . doi:10.1017/aog.2020.12 <https://doi.org/10.1017/aog.2020.12> , hdl:10013/epic.b1caa2bd-9f06-4fef-8438-f165a2c84e39 EPIC3Annals of Glaciology, INT GLACIOL SOC, 61(81), pp. 143-153, ISSN: 0260-3055 Article isiRev 2020 ftawi https://doi.org/10.1017/aog.2020.12 2021-12-24T15:45:20Z 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 setting. Article in Journal/Newspaper Annals of Glaciology East Greenland East Greenland Ice-core Project Greenland Greenland ice core Greenland Ice core Project ice core Ice Sheet Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Greenland Annals of Glaciology 61 81 143 153 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
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 setting. |
format |
Article in Journal/Newspaper |
author |
Franke, Steven Jansen, Daniela Binder, Tobias Dörr, Nils Helm, Veit Paden, John Steinhage, Daniel Eisen, Olaf |
spellingShingle |
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 |
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 |
INT GLACIOL SOC |
publishDate |
2020 |
url |
https://epic.awi.de/id/eprint/51448/ https://epic.awi.de/id/eprint/51448/1/bed_topography_and_subglacial_landforms_in_the_onset_region_of_the_northeast_greenland_ice_stream.pdf https://hdl.handle.net/10013/epic.b1caa2bd-9f06-4fef-8438-f165a2c84e39 https://hdl.handle.net/ |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Annals of Glaciology East Greenland East Greenland Ice-core Project Greenland Greenland ice core Greenland Ice core Project ice core Ice Sheet |
genre_facet |
Annals of Glaciology East Greenland East Greenland Ice-core Project Greenland Greenland ice core Greenland Ice core Project ice core Ice Sheet |
op_source |
EPIC3Annals of Glaciology, INT GLACIOL SOC, 61(81), pp. 143-153, ISSN: 0260-3055 |
op_relation |
https://epic.awi.de/id/eprint/51448/1/bed_topography_and_subglacial_landforms_in_the_onset_region_of_the_northeast_greenland_ice_stream.pdf https://hdl.handle.net/ Franke, S. orcid:0000-0001-8462-4379 , Jansen, D. orcid:0000-0002-4412-5820 , Binder, T. , Dörr, N. orcid:0000-0002-7594-7886 , Helm, V. orcid:0000-0001-7788-9328 , Paden, J. , Steinhage, D. orcid:0000-0003-4737-9751 and Eisen, O. orcid:0000-0002-6380-962X (2020) Bed topography and subglacial landforms in the onset region of the Northeast Greenland Ice Stream , Annals of Glaciology, 61 (81), pp. 143-153 . doi:10.1017/aog.2020.12 <https://doi.org/10.1017/aog.2020.12> , hdl:10013/epic.b1caa2bd-9f06-4fef-8438-f165a2c84e39 |
op_doi |
https://doi.org/10.1017/aog.2020.12 |
container_title |
Annals of Glaciology |
container_volume |
61 |
container_issue |
81 |
container_start_page |
143 |
op_container_end_page |
153 |
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1766003299349168128 |