Comparing numerical ice-sheet model output with radio-echo sounding measurements in the Weddell Sea sector of West Antarctica
Numerical ice-sheet models are commonly matched to surface ice velocities from InSAR measurements by modifying basal drag, allowing the flow and form of the ice sheet to be simulated. Geophysical measurements of the bed are rarely used to examine if this modification is realistic, however. Here, we...
Published in: | Annals of Glaciology |
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Cambridge University Press
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ftdoajarticles:oai:doaj.org/article:5be9410e9f254fc59855dfc03472dc18 2023-05-15T13:29:32+02:00 Comparing numerical ice-sheet model output with radio-echo sounding measurements in the Weddell Sea sector of West Antarctica Hafeez Jeofry Neil Ross Martin J. Siegert 2020-04-01T00:00:00Z https://doi.org/10.1017/aog.2019.39 https://doaj.org/article/5be9410e9f254fc59855dfc03472dc18 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0260305519000399/type/journal_article https://doaj.org/toc/0260-3055 https://doaj.org/toc/1727-5644 doi:10.1017/aog.2019.39 0260-3055 1727-5644 https://doaj.org/article/5be9410e9f254fc59855dfc03472dc18 Annals of Glaciology, Vol 61, Pp 188-197 (2020) Ice-sheet modelling ice streams radio-echo sounding Meteorology. Climatology QC851-999 article 2020 ftdoajarticles https://doi.org/10.1017/aog.2019.39 2023-03-12T01:31:55Z Numerical ice-sheet models are commonly matched to surface ice velocities from InSAR measurements by modifying basal drag, allowing the flow and form of the ice sheet to be simulated. Geophysical measurements of the bed are rarely used to examine if this modification is realistic, however. Here, we examine radio-echo sounding (RES) data from the Weddell Sea sector of West Antarctica to investigate how the output from a well-established ice-sheet model compares with measurements of the basal environment. We know the Weddell Sea sector contains the Institute, Möller and Foundation ice streams, each with distinct basal characteristics: Institute Ice Stream lies partly over wet unconsolidated sediments, where basal drag is very low; Möller Ice Stream lies on relatively rough bed, where basal drag is likely larger; and Foundation Ice Stream is controlled by a deep subglacial trough with flow-aligned bedrock landforms and smooth unconsolidated sediments. In general, the ice-sheet model represents each ice-stream system well. We also find that ice velocities do not match perfectly in some locations, and that adjustment of the boundaries of low basal drag, to reflect RES evidence, should improve model performance. Our work showcases the usefulness of RES in calibrating ice-sheet model results with observations of the bed. Article in Journal/Newspaper Annals of Glaciology Antarc* Antarctica Foundation Ice Stream Ice Sheet Institute Ice Stream Möller Ice Stream Weddell Sea West Antarctica Directory of Open Access Journals: DOAJ Articles Weddell Sea West Antarctica Weddell Foundation Ice Stream ENVELOPE(-60.000,-60.000,-83.250,-83.250) Institute Ice Stream ENVELOPE(-75.000,-75.000,-82.000,-82.000) Möller Ice Stream ENVELOPE(-63.000,-63.000,-82.000,-82.000) Annals of Glaciology 61 81 188 197 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ice-sheet modelling ice streams radio-echo sounding Meteorology. Climatology QC851-999 |
spellingShingle |
Ice-sheet modelling ice streams radio-echo sounding Meteorology. Climatology QC851-999 Hafeez Jeofry Neil Ross Martin J. Siegert Comparing numerical ice-sheet model output with radio-echo sounding measurements in the Weddell Sea sector of West Antarctica |
topic_facet |
Ice-sheet modelling ice streams radio-echo sounding Meteorology. Climatology QC851-999 |
description |
Numerical ice-sheet models are commonly matched to surface ice velocities from InSAR measurements by modifying basal drag, allowing the flow and form of the ice sheet to be simulated. Geophysical measurements of the bed are rarely used to examine if this modification is realistic, however. Here, we examine radio-echo sounding (RES) data from the Weddell Sea sector of West Antarctica to investigate how the output from a well-established ice-sheet model compares with measurements of the basal environment. We know the Weddell Sea sector contains the Institute, Möller and Foundation ice streams, each with distinct basal characteristics: Institute Ice Stream lies partly over wet unconsolidated sediments, where basal drag is very low; Möller Ice Stream lies on relatively rough bed, where basal drag is likely larger; and Foundation Ice Stream is controlled by a deep subglacial trough with flow-aligned bedrock landforms and smooth unconsolidated sediments. In general, the ice-sheet model represents each ice-stream system well. We also find that ice velocities do not match perfectly in some locations, and that adjustment of the boundaries of low basal drag, to reflect RES evidence, should improve model performance. Our work showcases the usefulness of RES in calibrating ice-sheet model results with observations of the bed. |
format |
Article in Journal/Newspaper |
author |
Hafeez Jeofry Neil Ross Martin J. Siegert |
author_facet |
Hafeez Jeofry Neil Ross Martin J. Siegert |
author_sort |
Hafeez Jeofry |
title |
Comparing numerical ice-sheet model output with radio-echo sounding measurements in the Weddell Sea sector of West Antarctica |
title_short |
Comparing numerical ice-sheet model output with radio-echo sounding measurements in the Weddell Sea sector of West Antarctica |
title_full |
Comparing numerical ice-sheet model output with radio-echo sounding measurements in the Weddell Sea sector of West Antarctica |
title_fullStr |
Comparing numerical ice-sheet model output with radio-echo sounding measurements in the Weddell Sea sector of West Antarctica |
title_full_unstemmed |
Comparing numerical ice-sheet model output with radio-echo sounding measurements in the Weddell Sea sector of West Antarctica |
title_sort |
comparing numerical ice-sheet model output with radio-echo sounding measurements in the weddell sea sector of west antarctica |
publisher |
Cambridge University Press |
publishDate |
2020 |
url |
https://doi.org/10.1017/aog.2019.39 https://doaj.org/article/5be9410e9f254fc59855dfc03472dc18 |
long_lat |
ENVELOPE(-60.000,-60.000,-83.250,-83.250) ENVELOPE(-75.000,-75.000,-82.000,-82.000) ENVELOPE(-63.000,-63.000,-82.000,-82.000) |
geographic |
Weddell Sea West Antarctica Weddell Foundation Ice Stream Institute Ice Stream Möller Ice Stream |
geographic_facet |
Weddell Sea West Antarctica Weddell Foundation Ice Stream Institute Ice Stream Möller Ice Stream |
genre |
Annals of Glaciology Antarc* Antarctica Foundation Ice Stream Ice Sheet Institute Ice Stream Möller Ice Stream Weddell Sea West Antarctica |
genre_facet |
Annals of Glaciology Antarc* Antarctica Foundation Ice Stream Ice Sheet Institute Ice Stream Möller Ice Stream Weddell Sea West Antarctica |
op_source |
Annals of Glaciology, Vol 61, Pp 188-197 (2020) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0260305519000399/type/journal_article https://doaj.org/toc/0260-3055 https://doaj.org/toc/1727-5644 doi:10.1017/aog.2019.39 0260-3055 1727-5644 https://doaj.org/article/5be9410e9f254fc59855dfc03472dc18 |
op_doi |
https://doi.org/10.1017/aog.2019.39 |
container_title |
Annals of Glaciology |
container_volume |
61 |
container_issue |
81 |
container_start_page |
188 |
op_container_end_page |
197 |
_version_ |
1766001126562332672 |