Basal roughness of the East Antarctic Ice Sheet in relation to flow speed and basal thermal state
Basal motion of ice sheets depends in part on the roughness and material properties of the subglacial bed and the occurrence of water. To date, basal motion represents one of the largest uncertainties in ice-flow models. It is that component of the total flow velocity that can change most rapidly an...
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ftawi:oai:epic.awi.de:52909 2023-05-15T13:29:48+02:00 Basal roughness of the East Antarctic Ice Sheet in relation to flow speed and basal thermal state Eisen, Olaf Winter, Anna Steinhage, Daniel Kleiner, Thomas Humbert, Angelika 2020 application/pdf https://epic.awi.de/id/eprint/52909/ https://epic.awi.de/id/eprint/52909/1/AOG2000047_published.pdf https://hdl.handle.net/10013/epic.db60822e-7a34-4b61-870f-b0e0595e9f13 https://hdl.handle.net/ unknown https://epic.awi.de/id/eprint/52909/1/AOG2000047_published.pdf https://hdl.handle.net/ Eisen, O. orcid:0000-0002-6380-962X , Winter, A. , Steinhage, D. orcid:0000-0003-4737-9751 , Kleiner, T. orcid:0000-0001-7825-5765 and Humbert, A. (2020) Basal roughness of the East Antarctic Ice Sheet in relation to flow speed and basal thermal state , Annals of Glaciology, 61 (81), pp. 162-175 . doi:10.1017/aog.2020.47 <https://doi.org/10.1017/aog.2020.47> , hdl:10013/epic.db60822e-7a34-4b61-870f-b0e0595e9f13 EPIC3Annals of Glaciology, 61(81), pp. 162-175, ISSN: 0260-3055 Article isiRev 2020 ftawi https://doi.org/10.1017/aog.2020.47 2021-12-24T15:45:53Z Basal motion of ice sheets depends in part on the roughness and material properties of the subglacial bed and the occurrence of water. To date, basal motion represents one of the largest uncertainties in ice-flow models. It is that component of the total flow velocity that can change most rapidly and can, therefore, facilitate rapid variations in dynamic behaviour. In this study, we investigate the subglacial properties of the East Antarctic Ice Sheet by statistically analysing the roughness of the bed topography, inferred from radio-echo sounding measurements. We analyse two sets of roughness parameters, one derived in the spatial and the other in the spectral domain, with two roughness parameters each. This enables us to compare the suitability of the four roughness parameters to classify the subglacial landscapes below the ice sheet. We further investigate the relationship of the roughness parameters with observed surface flow velocity and modelled basal temperatures of the ice sheet. We find that one of the roughness parameters, the Hurst exponent derived in the spatial domain, coincides with the thermal condition at the base of the ice sheet for slow flow velocities and varies with flow velocity. Article in Journal/Newspaper Annals of Glaciology Antarc* Antarctic Ice Sheet Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic East Antarctic Ice Sheet Annals of Glaciology 61 81 162 175 |
institution |
Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Basal motion of ice sheets depends in part on the roughness and material properties of the subglacial bed and the occurrence of water. To date, basal motion represents one of the largest uncertainties in ice-flow models. It is that component of the total flow velocity that can change most rapidly and can, therefore, facilitate rapid variations in dynamic behaviour. In this study, we investigate the subglacial properties of the East Antarctic Ice Sheet by statistically analysing the roughness of the bed topography, inferred from radio-echo sounding measurements. We analyse two sets of roughness parameters, one derived in the spatial and the other in the spectral domain, with two roughness parameters each. This enables us to compare the suitability of the four roughness parameters to classify the subglacial landscapes below the ice sheet. We further investigate the relationship of the roughness parameters with observed surface flow velocity and modelled basal temperatures of the ice sheet. We find that one of the roughness parameters, the Hurst exponent derived in the spatial domain, coincides with the thermal condition at the base of the ice sheet for slow flow velocities and varies with flow velocity. |
format |
Article in Journal/Newspaper |
author |
Eisen, Olaf Winter, Anna Steinhage, Daniel Kleiner, Thomas Humbert, Angelika |
spellingShingle |
Eisen, Olaf Winter, Anna Steinhage, Daniel Kleiner, Thomas Humbert, Angelika Basal roughness of the East Antarctic Ice Sheet in relation to flow speed and basal thermal state |
author_facet |
Eisen, Olaf Winter, Anna Steinhage, Daniel Kleiner, Thomas Humbert, Angelika |
author_sort |
Eisen, Olaf |
title |
Basal roughness of the East Antarctic Ice Sheet in relation to flow speed and basal thermal state |
title_short |
Basal roughness of the East Antarctic Ice Sheet in relation to flow speed and basal thermal state |
title_full |
Basal roughness of the East Antarctic Ice Sheet in relation to flow speed and basal thermal state |
title_fullStr |
Basal roughness of the East Antarctic Ice Sheet in relation to flow speed and basal thermal state |
title_full_unstemmed |
Basal roughness of the East Antarctic Ice Sheet in relation to flow speed and basal thermal state |
title_sort |
basal roughness of the east antarctic ice sheet in relation to flow speed and basal thermal state |
publishDate |
2020 |
url |
https://epic.awi.de/id/eprint/52909/ https://epic.awi.de/id/eprint/52909/1/AOG2000047_published.pdf https://hdl.handle.net/10013/epic.db60822e-7a34-4b61-870f-b0e0595e9f13 https://hdl.handle.net/ |
geographic |
Antarctic East Antarctic Ice Sheet |
geographic_facet |
Antarctic East Antarctic Ice Sheet |
genre |
Annals of Glaciology Antarc* Antarctic Ice Sheet |
genre_facet |
Annals of Glaciology Antarc* Antarctic Ice Sheet |
op_source |
EPIC3Annals of Glaciology, 61(81), pp. 162-175, ISSN: 0260-3055 |
op_relation |
https://epic.awi.de/id/eprint/52909/1/AOG2000047_published.pdf https://hdl.handle.net/ Eisen, O. orcid:0000-0002-6380-962X , Winter, A. , Steinhage, D. orcid:0000-0003-4737-9751 , Kleiner, T. orcid:0000-0001-7825-5765 and Humbert, A. (2020) Basal roughness of the East Antarctic Ice Sheet in relation to flow speed and basal thermal state , Annals of Glaciology, 61 (81), pp. 162-175 . doi:10.1017/aog.2020.47 <https://doi.org/10.1017/aog.2020.47> , hdl:10013/epic.db60822e-7a34-4b61-870f-b0e0595e9f13 |
op_doi |
https://doi.org/10.1017/aog.2020.47 |
container_title |
Annals of Glaciology |
container_volume |
61 |
container_issue |
81 |
container_start_page |
162 |
op_container_end_page |
175 |
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1766003207528513536 |