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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Cambridge University Press
2020
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ftdoajarticles:oai:doaj.org/article:9256ab8d11b84017872d7bffc47730e8 2023-05-15T13:29:33+02:00 Basal roughness of the East Antarctic Ice Sheet in relation to flow speed and basal thermal state Olaf Eisen Anna Winter Daniel Steinhage Thomas Kleiner Angelika Humbert 2020-04-01T00:00:00Z https://doi.org/10.1017/aog.2020.47 https://doaj.org/article/9256ab8d11b84017872d7bffc47730e8 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0260305520000476/type/journal_article https://doaj.org/toc/0260-3055 https://doaj.org/toc/1727-5644 doi:10.1017/aog.2020.47 0260-3055 1727-5644 https://doaj.org/article/9256ab8d11b84017872d7bffc47730e8 Annals of Glaciology, Vol 61, Pp 162-175 (2020) Aerogeophysical measurements basal ice ice temperature ice thickness measurements radio-echo sounding Meteorology. Climatology QC851-999 article 2020 ftdoajarticles https://doi.org/10.1017/aog.2020.47 2023-03-12T01:31:55Z 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 Directory of Open Access Journals: DOAJ Articles Antarctic East Antarctic Ice Sheet Annals of Glaciology 61 81 162 175 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Aerogeophysical measurements basal ice ice temperature ice thickness measurements radio-echo sounding Meteorology. Climatology QC851-999 |
spellingShingle |
Aerogeophysical measurements basal ice ice temperature ice thickness measurements radio-echo sounding Meteorology. Climatology QC851-999 Olaf Eisen Anna Winter Daniel Steinhage Thomas Kleiner Angelika Humbert Basal roughness of the East Antarctic Ice Sheet in relation to flow speed and basal thermal state |
topic_facet |
Aerogeophysical measurements basal ice ice temperature ice thickness measurements radio-echo sounding Meteorology. Climatology QC851-999 |
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 |
Olaf Eisen Anna Winter Daniel Steinhage Thomas Kleiner Angelika Humbert |
author_facet |
Olaf Eisen Anna Winter Daniel Steinhage Thomas Kleiner Angelika Humbert |
author_sort |
Olaf Eisen |
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 |
publisher |
Cambridge University Press |
publishDate |
2020 |
url |
https://doi.org/10.1017/aog.2020.47 https://doaj.org/article/9256ab8d11b84017872d7bffc47730e8 |
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 |
Annals of Glaciology, Vol 61, Pp 162-175 (2020) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0260305520000476/type/journal_article https://doaj.org/toc/0260-3055 https://doaj.org/toc/1727-5644 doi:10.1017/aog.2020.47 0260-3055 1727-5644 https://doaj.org/article/9256ab8d11b84017872d7bffc47730e8 |
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 |
_version_ |
1766001196508643328 |