Subglacial controls on the flow of Institute Ice Stream, West Antarctica
The Institute Ice Stream (IIS) rests on a reverse-sloping bed, extending >150 km upstream into the ~1.8 km deep Robin Subglacial Basin, placing it at the threshold of marine ice-sheet instability. Understanding IIS vulnerability has focused on the effect of grounding-line melting, which is foreca...
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ftdoajarticles:oai:doaj.org/article:7dbc6844a4f7469ebca80aee109e6e60 2023-05-15T13:29:29+02:00 Subglacial controls on the flow of Institute Ice Stream, West Antarctica Martin J. Siegert Neil Ross Jilu Li Dustin M. Schroeder David Rippin David Ashmore Robert Bingham Prasad Gogineni 2016-09-01T00:00:00Z https://doi.org/10.1017/aog.2016.17 https://doaj.org/article/7dbc6844a4f7469ebca80aee109e6e60 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0260305516000173/type/journal_article https://doaj.org/toc/0260-3055 https://doaj.org/toc/1727-5644 doi:10.1017/aog.2016.17 0260-3055 1727-5644 https://doaj.org/article/7dbc6844a4f7469ebca80aee109e6e60 Annals of Glaciology, Vol 57, Pp 19-24 (2016) basal hydrology ice dynamics radio-echo sounding sediments Meteorology. Climatology QC851-999 article 2016 ftdoajarticles https://doi.org/10.1017/aog.2016.17 2023-03-12T01:31:57Z The Institute Ice Stream (IIS) rests on a reverse-sloping bed, extending >150 km upstream into the ~1.8 km deep Robin Subglacial Basin, placing it at the threshold of marine ice-sheet instability. Understanding IIS vulnerability has focused on the effect of grounding-line melting, which is forecast to increase significantly this century. Changes to ice-flow dynamics are also important to IIS stability, yet little is known about them. Here we reveal that the trunk of the IIS occurs downstream of the intersection of three discrete subglacial features; a large ‘active’ subglacial lake, a newly-discovered sharp transition to a zone of weak basal sediments and a major tectonic rift. The border of IIS trunk flow is confined by the sediment on one side, and by a transition between basal melting and freezing at the border with the Bungenstock Ice Rise. By showing how basal sediment and water dictate present-day flow of IIS, we reveal that ice-sheet stability here is dependent on this unusual arrangement. Article in Journal/Newspaper Annals of Glaciology Antarc* Antarctica Ice Sheet Institute Ice Stream West Antarctica Directory of Open Access Journals: DOAJ Articles West Antarctica Institute Ice Stream ENVELOPE(-75.000,-75.000,-82.000,-82.000) Robin Subglacial Basin ENVELOPE(-75.000,-75.000,-82.000,-82.000) Annals of Glaciology 57 73 19 24 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
basal hydrology ice dynamics radio-echo sounding sediments Meteorology. Climatology QC851-999 |
spellingShingle |
basal hydrology ice dynamics radio-echo sounding sediments Meteorology. Climatology QC851-999 Martin J. Siegert Neil Ross Jilu Li Dustin M. Schroeder David Rippin David Ashmore Robert Bingham Prasad Gogineni Subglacial controls on the flow of Institute Ice Stream, West Antarctica |
topic_facet |
basal hydrology ice dynamics radio-echo sounding sediments Meteorology. Climatology QC851-999 |
description |
The Institute Ice Stream (IIS) rests on a reverse-sloping bed, extending >150 km upstream into the ~1.8 km deep Robin Subglacial Basin, placing it at the threshold of marine ice-sheet instability. Understanding IIS vulnerability has focused on the effect of grounding-line melting, which is forecast to increase significantly this century. Changes to ice-flow dynamics are also important to IIS stability, yet little is known about them. Here we reveal that the trunk of the IIS occurs downstream of the intersection of three discrete subglacial features; a large ‘active’ subglacial lake, a newly-discovered sharp transition to a zone of weak basal sediments and a major tectonic rift. The border of IIS trunk flow is confined by the sediment on one side, and by a transition between basal melting and freezing at the border with the Bungenstock Ice Rise. By showing how basal sediment and water dictate present-day flow of IIS, we reveal that ice-sheet stability here is dependent on this unusual arrangement. |
format |
Article in Journal/Newspaper |
author |
Martin J. Siegert Neil Ross Jilu Li Dustin M. Schroeder David Rippin David Ashmore Robert Bingham Prasad Gogineni |
author_facet |
Martin J. Siegert Neil Ross Jilu Li Dustin M. Schroeder David Rippin David Ashmore Robert Bingham Prasad Gogineni |
author_sort |
Martin J. Siegert |
title |
Subglacial controls on the flow of Institute Ice Stream, West Antarctica |
title_short |
Subglacial controls on the flow of Institute Ice Stream, West Antarctica |
title_full |
Subglacial controls on the flow of Institute Ice Stream, West Antarctica |
title_fullStr |
Subglacial controls on the flow of Institute Ice Stream, West Antarctica |
title_full_unstemmed |
Subglacial controls on the flow of Institute Ice Stream, West Antarctica |
title_sort |
subglacial controls on the flow of institute ice stream, west antarctica |
publisher |
Cambridge University Press |
publishDate |
2016 |
url |
https://doi.org/10.1017/aog.2016.17 https://doaj.org/article/7dbc6844a4f7469ebca80aee109e6e60 |
long_lat |
ENVELOPE(-75.000,-75.000,-82.000,-82.000) ENVELOPE(-75.000,-75.000,-82.000,-82.000) |
geographic |
West Antarctica Institute Ice Stream Robin Subglacial Basin |
geographic_facet |
West Antarctica Institute Ice Stream Robin Subglacial Basin |
genre |
Annals of Glaciology Antarc* Antarctica Ice Sheet Institute Ice Stream West Antarctica |
genre_facet |
Annals of Glaciology Antarc* Antarctica Ice Sheet Institute Ice Stream West Antarctica |
op_source |
Annals of Glaciology, Vol 57, Pp 19-24 (2016) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0260305516000173/type/journal_article https://doaj.org/toc/0260-3055 https://doaj.org/toc/1727-5644 doi:10.1017/aog.2016.17 0260-3055 1727-5644 https://doaj.org/article/7dbc6844a4f7469ebca80aee109e6e60 |
op_doi |
https://doi.org/10.1017/aog.2016.17 |
container_title |
Annals of Glaciology |
container_volume |
57 |
container_issue |
73 |
container_start_page |
19 |
op_container_end_page |
24 |
_version_ |
1766000928370982912 |