Subglacial roughness of the former Barents Sea ice sheet

The roughness of a glacier bed has high importance for the estimation of the sliding velocity and can also provide valuable insights into the dynamics and history of ice sheets, depending on scale. Measurement of basal properties in present-day ice sheets is restricted to ground-penetrating radar an...

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Published in:Journal of Geophysical Research: Earth Surface
Main Authors: Gudlaugsson, Eythor, Humbert, A., Winsborrow, Monica, Andreassen, Karin
Format: Article in Journal/Newspaper
Language:English
Published: American Geophysical Union (AGU) 2013
Subjects:
Online Access:https://hdl.handle.net/10037/7361
https://doi.org/10.1002/2013JF002714
id ftunivtroemsoe:oai:munin.uit.no:10037/7361
record_format openpolar
spelling ftunivtroemsoe:oai:munin.uit.no:10037/7361 2023-05-15T13:45:59+02:00 Subglacial roughness of the former Barents Sea ice sheet Gudlaugsson, Eythor Humbert, A. Winsborrow, Monica Andreassen, Karin 2013 https://hdl.handle.net/10037/7361 https://doi.org/10.1002/2013JF002714 eng eng American Geophysical Union (AGU) Gudlaugsson, E. (2015). Modelling the subglacial hydrology of the former Barents Sea Ice Sheet. (Doctoral thesis). https://hdl.handle.net/10037/25064 Journal of Geophysical Research - Earth Surface 118(2013) nr. 4 s. 2546-2556 FRIDAID 1116086 doi:10.1002/2013JF002714 2169-9003 https://hdl.handle.net/10037/7361 URN:NBN:no-uit_munin_6957 openAccess VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Kvartærgeologi glasiologi: 465 VDP::Mathematics and natural science: 400::Geosciences: 450::Quaternary geology glaciology: 465 Journal article Tidsskriftartikkel Peer reviewed 2013 ftunivtroemsoe https://doi.org/10.1002/2013JF002714 2022-05-11T22:58:43Z The roughness of a glacier bed has high importance for the estimation of the sliding velocity and can also provide valuable insights into the dynamics and history of ice sheets, depending on scale. Measurement of basal properties in present-day ice sheets is restricted to ground-penetrating radar and seismics, with surveys retrieving relatively coarse data sets. Deglaciated areas, like the Barents Sea, can be surveyed by shipborne 2-D and 3-D seismics and multibeam sonar and provide the possibility of studying the basal roughness of former ice sheets and ice streams with high resolution. Here, for the first time, we quantify the subglacial roughness of the former Barents Sea ice sheet by estimating the spectral roughness of the basal topography. We also make deductions about the past flow directions by investigating how the roughness varies along a 2-D line as the orientation of the line changes. Lastly, we investigate how the estimated basal roughness is affected by the resolution of the basal topography data set by comparing the spectral roughness along a cross section using various sampling intervals. We find that the roughness typically varies on a similar scale as for other previously marine-inundated areas in West Antarctica, with subglacial troughs having very low roughness, consistent with fast ice flow and high rates of basal erosion. The resolution of the data set seems to be of minor importance when comparing roughness indices calculated with a fixed profile length. A strong dependence on track orientation is shown for all wavelengths, with profiles having higher roughness across former flow directions than along them. Article in Journal/Newspaper Antarc* Antarctica Barents Sea Ice Sheet Sea ice West Antarctica University of Tromsø: Munin Open Research Archive Barents Sea West Antarctica Journal of Geophysical Research: Earth Surface 118 4 2546 2556
institution Open Polar
collection University of Tromsø: Munin Open Research Archive
op_collection_id ftunivtroemsoe
language English
topic VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Kvartærgeologi
glasiologi: 465
VDP::Mathematics and natural science: 400::Geosciences: 450::Quaternary geology
glaciology: 465
spellingShingle VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Kvartærgeologi
glasiologi: 465
VDP::Mathematics and natural science: 400::Geosciences: 450::Quaternary geology
glaciology: 465
Gudlaugsson, Eythor
Humbert, A.
Winsborrow, Monica
Andreassen, Karin
Subglacial roughness of the former Barents Sea ice sheet
topic_facet VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Kvartærgeologi
glasiologi: 465
VDP::Mathematics and natural science: 400::Geosciences: 450::Quaternary geology
glaciology: 465
description The roughness of a glacier bed has high importance for the estimation of the sliding velocity and can also provide valuable insights into the dynamics and history of ice sheets, depending on scale. Measurement of basal properties in present-day ice sheets is restricted to ground-penetrating radar and seismics, with surveys retrieving relatively coarse data sets. Deglaciated areas, like the Barents Sea, can be surveyed by shipborne 2-D and 3-D seismics and multibeam sonar and provide the possibility of studying the basal roughness of former ice sheets and ice streams with high resolution. Here, for the first time, we quantify the subglacial roughness of the former Barents Sea ice sheet by estimating the spectral roughness of the basal topography. We also make deductions about the past flow directions by investigating how the roughness varies along a 2-D line as the orientation of the line changes. Lastly, we investigate how the estimated basal roughness is affected by the resolution of the basal topography data set by comparing the spectral roughness along a cross section using various sampling intervals. We find that the roughness typically varies on a similar scale as for other previously marine-inundated areas in West Antarctica, with subglacial troughs having very low roughness, consistent with fast ice flow and high rates of basal erosion. The resolution of the data set seems to be of minor importance when comparing roughness indices calculated with a fixed profile length. A strong dependence on track orientation is shown for all wavelengths, with profiles having higher roughness across former flow directions than along them.
format Article in Journal/Newspaper
author Gudlaugsson, Eythor
Humbert, A.
Winsborrow, Monica
Andreassen, Karin
author_facet Gudlaugsson, Eythor
Humbert, A.
Winsborrow, Monica
Andreassen, Karin
author_sort Gudlaugsson, Eythor
title Subglacial roughness of the former Barents Sea ice sheet
title_short Subglacial roughness of the former Barents Sea ice sheet
title_full Subglacial roughness of the former Barents Sea ice sheet
title_fullStr Subglacial roughness of the former Barents Sea ice sheet
title_full_unstemmed Subglacial roughness of the former Barents Sea ice sheet
title_sort subglacial roughness of the former barents sea ice sheet
publisher American Geophysical Union (AGU)
publishDate 2013
url https://hdl.handle.net/10037/7361
https://doi.org/10.1002/2013JF002714
geographic Barents Sea
West Antarctica
geographic_facet Barents Sea
West Antarctica
genre Antarc*
Antarctica
Barents Sea
Ice Sheet
Sea ice
West Antarctica
genre_facet Antarc*
Antarctica
Barents Sea
Ice Sheet
Sea ice
West Antarctica
op_relation Gudlaugsson, E. (2015). Modelling the subglacial hydrology of the former Barents Sea Ice Sheet. (Doctoral thesis). https://hdl.handle.net/10037/25064
Journal of Geophysical Research - Earth Surface 118(2013) nr. 4 s. 2546-2556
FRIDAID 1116086
doi:10.1002/2013JF002714
2169-9003
https://hdl.handle.net/10037/7361
URN:NBN:no-uit_munin_6957
op_rights openAccess
op_doi https://doi.org/10.1002/2013JF002714
container_title Journal of Geophysical Research: Earth Surface
container_volume 118
container_issue 4
container_start_page 2546
op_container_end_page 2556
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