Spectral roughness of subglacial topography and implications for former ice-sheet dynamics in East Antarctica
Ice-sheet basal erosion is controlled by ice dynamics (including the basal thermal regime) and the lithology of the substrate. Spatial variation in subglacial roughness is therefore likely to be a function of these controls. In Antarctica, very little is known about former ice dynamics and sub-ice g...
Published in: | Global and Planetary Change |
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Online Access: | https://hdl.handle.net/1983/d972f57d-faa3-485e-8717-8c68ef82a5b4 https://research-information.bris.ac.uk/en/publications/d972f57d-faa3-485e-8717-8c68ef82a5b4 https://doi.org/10.1016/j.gloplacha.2004.09.008 |
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ftubristolcris:oai:research-information.bris.ac.uk:publications/d972f57d-faa3-485e-8717-8c68ef82a5b4 2024-05-19T07:31:50+00:00 Spectral roughness of subglacial topography and implications for former ice-sheet dynamics in East Antarctica Siegert, MJ Taylor, J Payne, AJ 2005 https://hdl.handle.net/1983/d972f57d-faa3-485e-8717-8c68ef82a5b4 https://research-information.bris.ac.uk/en/publications/d972f57d-faa3-485e-8717-8c68ef82a5b4 https://doi.org/10.1016/j.gloplacha.2004.09.008 eng eng https://research-information.bris.ac.uk/en/publications/d972f57d-faa3-485e-8717-8c68ef82a5b4 info:eu-repo/semantics/restrictedAccess Siegert , MJ , Taylor , J & Payne , AJ 2005 , ' Spectral roughness of subglacial topography and implications for former ice-sheet dynamics in East Antarctica ' , Global and Planetary Change , vol. 45 , pp. 249 - 263 . https://doi.org/10.1016/j.gloplacha.2004.09.008 article 2005 ftubristolcris https://doi.org/10.1016/j.gloplacha.2004.09.008 2024-04-23T23:41:22Z Ice-sheet basal erosion is controlled by ice dynamics (including the basal thermal regime) and the lithology of the substrate. Spatial variation in subglacial roughness is therefore likely to be a function of these controls. In Antarctica, very little is known about former ice dynamics and sub-ice geology. Here, we calculate the spectral roughness of subglacial East Antarctica from an analysis of radio-echo sounding data. As the modem glaciological setting is understood reasonably well in East Antarctica from numerical ice-sheet modelling, we are able to compare the roughness calculations with contemporary ice-sheet dynamics. We show that ice divides at Ridge B and Dome A are underlain by rough terrain and a cold thermal regime. At the Dome C ice divide, however, the bed is noticeably smooth at the shorter wavelengths (similar to 5-10 km) but rougher at longer wavelengths. One interpretation is that subglacial morphology has been eroded, leaving a smoothed landscape that contains valleys and hills. Regardless of the origin of the valleys, their erosion is only possible if the ice sheet were more dynamic than at present. Hence, whereas Dome A and Ridge B have a bed morphology consistent with the present ice sheet, the morphology at Dome C is likely to predate the present ice-sheet configuration. Ice-sheet basal erosion is controlled by ice dynamics (including the basal thermal regime) and the lithology of the substrate. Spatial variation in subglacial roughness is therefore likely to be a function of these controls. In Antarctica, very little is known about former ice dynamics and sub-ice geology. Here, we calculate the spectral roughness of subglacial East Antarctica from an analysis of radio-echo sounding data. As the modem glaciological setting is understood reasonably well in East Antarctica from numerical ice-sheet modelling, we are able to compare the roughness calculations with contemporary ice-sheet dynamics. We show that ice divides at Ridge B and Dome A are underlain by rough terrain and a cold ... Article in Journal/Newspaper Antarc* Antarctica East Antarctica Ice Sheet University of Bristol: Bristol Research Global and Planetary Change 45 1-3 249 263 |
institution |
Open Polar |
collection |
University of Bristol: Bristol Research |
op_collection_id |
ftubristolcris |
language |
English |
description |
Ice-sheet basal erosion is controlled by ice dynamics (including the basal thermal regime) and the lithology of the substrate. Spatial variation in subglacial roughness is therefore likely to be a function of these controls. In Antarctica, very little is known about former ice dynamics and sub-ice geology. Here, we calculate the spectral roughness of subglacial East Antarctica from an analysis of radio-echo sounding data. As the modem glaciological setting is understood reasonably well in East Antarctica from numerical ice-sheet modelling, we are able to compare the roughness calculations with contemporary ice-sheet dynamics. We show that ice divides at Ridge B and Dome A are underlain by rough terrain and a cold thermal regime. At the Dome C ice divide, however, the bed is noticeably smooth at the shorter wavelengths (similar to 5-10 km) but rougher at longer wavelengths. One interpretation is that subglacial morphology has been eroded, leaving a smoothed landscape that contains valleys and hills. Regardless of the origin of the valleys, their erosion is only possible if the ice sheet were more dynamic than at present. Hence, whereas Dome A and Ridge B have a bed morphology consistent with the present ice sheet, the morphology at Dome C is likely to predate the present ice-sheet configuration. Ice-sheet basal erosion is controlled by ice dynamics (including the basal thermal regime) and the lithology of the substrate. Spatial variation in subglacial roughness is therefore likely to be a function of these controls. In Antarctica, very little is known about former ice dynamics and sub-ice geology. Here, we calculate the spectral roughness of subglacial East Antarctica from an analysis of radio-echo sounding data. As the modem glaciological setting is understood reasonably well in East Antarctica from numerical ice-sheet modelling, we are able to compare the roughness calculations with contemporary ice-sheet dynamics. We show that ice divides at Ridge B and Dome A are underlain by rough terrain and a cold ... |
format |
Article in Journal/Newspaper |
author |
Siegert, MJ Taylor, J Payne, AJ |
spellingShingle |
Siegert, MJ Taylor, J Payne, AJ Spectral roughness of subglacial topography and implications for former ice-sheet dynamics in East Antarctica |
author_facet |
Siegert, MJ Taylor, J Payne, AJ |
author_sort |
Siegert, MJ |
title |
Spectral roughness of subglacial topography and implications for former ice-sheet dynamics in East Antarctica |
title_short |
Spectral roughness of subglacial topography and implications for former ice-sheet dynamics in East Antarctica |
title_full |
Spectral roughness of subglacial topography and implications for former ice-sheet dynamics in East Antarctica |
title_fullStr |
Spectral roughness of subglacial topography and implications for former ice-sheet dynamics in East Antarctica |
title_full_unstemmed |
Spectral roughness of subglacial topography and implications for former ice-sheet dynamics in East Antarctica |
title_sort |
spectral roughness of subglacial topography and implications for former ice-sheet dynamics in east antarctica |
publishDate |
2005 |
url |
https://hdl.handle.net/1983/d972f57d-faa3-485e-8717-8c68ef82a5b4 https://research-information.bris.ac.uk/en/publications/d972f57d-faa3-485e-8717-8c68ef82a5b4 https://doi.org/10.1016/j.gloplacha.2004.09.008 |
genre |
Antarc* Antarctica East Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctica East Antarctica Ice Sheet |
op_source |
Siegert , MJ , Taylor , J & Payne , AJ 2005 , ' Spectral roughness of subglacial topography and implications for former ice-sheet dynamics in East Antarctica ' , Global and Planetary Change , vol. 45 , pp. 249 - 263 . https://doi.org/10.1016/j.gloplacha.2004.09.008 |
op_relation |
https://research-information.bris.ac.uk/en/publications/d972f57d-faa3-485e-8717-8c68ef82a5b4 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.gloplacha.2004.09.008 |
container_title |
Global and Planetary Change |
container_volume |
45 |
container_issue |
1-3 |
container_start_page |
249 |
op_container_end_page |
263 |
_version_ |
1799469730940059648 |