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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Cambridge University Press
2020
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ftdoajarticles:oai:doaj.org/article:17011c89551442029bae6505cf93c3dd 2023-05-15T13:29:35+02:00 Bed topography and subglacial landforms in the onset region of the Northeast Greenland Ice Stream Steven Franke Daniela Jansen Tobias Binder Nils Dörr Veit Helm John Paden Daniel Steinhage Olaf Eisen 2020-04-01T00:00:00Z https://doi.org/10.1017/aog.2020.12 https://doaj.org/article/17011c89551442029bae6505cf93c3dd EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0260305520000129/type/journal_article https://doaj.org/toc/0260-3055 https://doaj.org/toc/1727-5644 doi:10.1017/aog.2020.12 0260-3055 1727-5644 https://doaj.org/article/17011c89551442029bae6505cf93c3dd Annals of Glaciology, Vol 61, Pp 143-153 (2020) Glacial geomorphology glacier flow ice streams processes and landforms of glacial erosion radio-echo sounding Meteorology. Climatology QC851-999 article 2020 ftdoajarticles https://doi.org/10.1017/aog.2020.12 2023-03-12T01:31:55Z 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 glacier Greenland Greenland ice core Greenland Ice core Project ice core Ice Sheet Directory of Open Access Journals: DOAJ Articles Greenland Annals of Glaciology 61 81 143 153 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Glacial geomorphology glacier flow ice streams processes and landforms of glacial erosion radio-echo sounding Meteorology. Climatology QC851-999 |
spellingShingle |
Glacial geomorphology glacier flow ice streams processes and landforms of glacial erosion radio-echo sounding Meteorology. Climatology QC851-999 Steven Franke Daniela Jansen Tobias Binder Nils Dörr Veit Helm John Paden Daniel Steinhage Olaf Eisen 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 of glacial erosion radio-echo sounding Meteorology. Climatology QC851-999 |
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 |
Steven Franke Daniela Jansen Tobias Binder Nils Dörr Veit Helm John Paden Daniel Steinhage Olaf Eisen |
author_facet |
Steven Franke Daniela Jansen Tobias Binder Nils Dörr Veit Helm John Paden Daniel Steinhage Olaf Eisen |
author_sort |
Steven Franke |
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://doi.org/10.1017/aog.2020.12 https://doaj.org/article/17011c89551442029bae6505cf93c3dd |
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, Vol 61, Pp 143-153 (2020) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0260305520000129/type/journal_article https://doaj.org/toc/0260-3055 https://doaj.org/toc/1727-5644 doi:10.1017/aog.2020.12 0260-3055 1727-5644 https://doaj.org/article/17011c89551442029bae6505cf93c3dd |
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 |
_version_ |
1766001379084599296 |