High resolution ice thickness, bed topography, and roughness of a land terminating section of the western Greenland Ice Sheet
We present ice thickness and bed topography maps with high spatial resolution (250-500 m) of a large land terminating section of the western Greenland Ice Sheet. The maps cover the Isunnguata Sermia, Russell, and Leverett outlet glaciers and their catchment areas up to an elevation of ~1,700 m above...
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ftdtupubl:oai:pure.atira.dk:publications/9176dae3-b5b8-4a0a-a5a1-e38dd1ce5747 2023-05-15T16:28:15+02:00 High resolution ice thickness, bed topography, and roughness of a land terminating section of the western Greenland Ice Sheet Lindback, K. Pettersson, R. Doyle, S. H. Hubbard, A. Helanow, C. Kristensen, Steen Savstrup Stenseng, Lars Forsberg, René 2013 application/pdf https://orbit.dtu.dk/en/publications/9176dae3-b5b8-4a0a-a5a1-e38dd1ce5747 https://backend.orbit.dtu.dk/ws/files/87943193/KL_ELC_SSK_LS_RF.pdf http://abstractsearch.agu.org/meetings/2013/FM/sections/C/sessions/C31C/abstracts/C31C-07.html eng eng info:eu-repo/semantics/openAccess Lindback , K , Pettersson , R , Doyle , S H , Hubbard , A , Helanow , C , Kristensen , S S , Stenseng , L & Forsberg , R 2013 , ' High resolution ice thickness, bed topography, and roughness of a land terminating section of the western Greenland Ice Sheet ' , AGU Fall Meeting 2013 , San Francisco , United States , 09/12/2013 - 13/12/2013 . < http://abstractsearch.agu.org/meetings/2013/FM/sections/C/sessions/C31C/abstracts/C31C-07.html > conferenceObject 2013 ftdtupubl 2022-08-14T08:17:41Z We present ice thickness and bed topography maps with high spatial resolution (250-500 m) of a large land terminating section of the western Greenland Ice Sheet. The maps cover the Isunnguata Sermia, Russell, and Leverett outlet glaciers and their catchment areas up to an elevation of ~1,700 m above sea level. The bed topography shows an intricate subglacial trough system, resembling the landscape in the proglacial area. We also calculate the hydraulic potential to get a proxy of the subglacial routing of water in the area. To analyse the geomorphological conditions of the bed, we calculated the spectral roughness. We see a strong correlation of low roughness values with the ice flow direction; this makes it important to assess the direction of the radar profiles in relation to the flow direction when calculating effective subglacial roughness for an area. Low roughness values and high surface velocities also coincide with an overdeepened trough system in the northern parts of the area; an area where active smoothing could be taking place. The southern parts consist of high bed elevations and have generally high roughness values; the bedrock likely consists of hard unreworked orthogneiss. There is strong evidence that the subglacial troughs have a preglacial origin, since they are aligned with geological weakness zones in the proglacial area and several lineaments can be traced for long distances underneath the ice sheet. Conference Object Greenland Ice Sheet Technical University of Denmark: DTU Orbit Greenland Isunnguata Sermia ENVELOPE(-50.167,-50.167,67.183,67.183) |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
description |
We present ice thickness and bed topography maps with high spatial resolution (250-500 m) of a large land terminating section of the western Greenland Ice Sheet. The maps cover the Isunnguata Sermia, Russell, and Leverett outlet glaciers and their catchment areas up to an elevation of ~1,700 m above sea level. The bed topography shows an intricate subglacial trough system, resembling the landscape in the proglacial area. We also calculate the hydraulic potential to get a proxy of the subglacial routing of water in the area. To analyse the geomorphological conditions of the bed, we calculated the spectral roughness. We see a strong correlation of low roughness values with the ice flow direction; this makes it important to assess the direction of the radar profiles in relation to the flow direction when calculating effective subglacial roughness for an area. Low roughness values and high surface velocities also coincide with an overdeepened trough system in the northern parts of the area; an area where active smoothing could be taking place. The southern parts consist of high bed elevations and have generally high roughness values; the bedrock likely consists of hard unreworked orthogneiss. There is strong evidence that the subglacial troughs have a preglacial origin, since they are aligned with geological weakness zones in the proglacial area and several lineaments can be traced for long distances underneath the ice sheet. |
format |
Conference Object |
author |
Lindback, K. Pettersson, R. Doyle, S. H. Hubbard, A. Helanow, C. Kristensen, Steen Savstrup Stenseng, Lars Forsberg, René |
spellingShingle |
Lindback, K. Pettersson, R. Doyle, S. H. Hubbard, A. Helanow, C. Kristensen, Steen Savstrup Stenseng, Lars Forsberg, René High resolution ice thickness, bed topography, and roughness of a land terminating section of the western Greenland Ice Sheet |
author_facet |
Lindback, K. Pettersson, R. Doyle, S. H. Hubbard, A. Helanow, C. Kristensen, Steen Savstrup Stenseng, Lars Forsberg, René |
author_sort |
Lindback, K. |
title |
High resolution ice thickness, bed topography, and roughness of a land terminating section of the western Greenland Ice Sheet |
title_short |
High resolution ice thickness, bed topography, and roughness of a land terminating section of the western Greenland Ice Sheet |
title_full |
High resolution ice thickness, bed topography, and roughness of a land terminating section of the western Greenland Ice Sheet |
title_fullStr |
High resolution ice thickness, bed topography, and roughness of a land terminating section of the western Greenland Ice Sheet |
title_full_unstemmed |
High resolution ice thickness, bed topography, and roughness of a land terminating section of the western Greenland Ice Sheet |
title_sort |
high resolution ice thickness, bed topography, and roughness of a land terminating section of the western greenland ice sheet |
publishDate |
2013 |
url |
https://orbit.dtu.dk/en/publications/9176dae3-b5b8-4a0a-a5a1-e38dd1ce5747 https://backend.orbit.dtu.dk/ws/files/87943193/KL_ELC_SSK_LS_RF.pdf http://abstractsearch.agu.org/meetings/2013/FM/sections/C/sessions/C31C/abstracts/C31C-07.html |
long_lat |
ENVELOPE(-50.167,-50.167,67.183,67.183) |
geographic |
Greenland Isunnguata Sermia |
geographic_facet |
Greenland Isunnguata Sermia |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
Lindback , K , Pettersson , R , Doyle , S H , Hubbard , A , Helanow , C , Kristensen , S S , Stenseng , L & Forsberg , R 2013 , ' High resolution ice thickness, bed topography, and roughness of a land terminating section of the western Greenland Ice Sheet ' , AGU Fall Meeting 2013 , San Francisco , United States , 09/12/2013 - 13/12/2013 . < http://abstractsearch.agu.org/meetings/2013/FM/sections/C/sessions/C31C/abstracts/C31C-07.html > |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766017888604389376 |