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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Cambridge University Press
2016
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Online Access: | http://hdl.handle.net/10044/1/30606 https://doi.org/10.1017/aog.2016.17 |
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ftimperialcol:oai:spiral.imperial.ac.uk:10044/1/30606 2023-05-15T13:29:06+02:00 Subglacial controls on the flow of Institute Ice Stream, West Antarctica Siegert, MJ Ross, N Li, J Schroeder, DM Rippin, D Ashmore, D Bingham, R Gogineni, P Natural Environment Research Council (NERC) 2016-04-04 http://hdl.handle.net/10044/1/30606 https://doi.org/10.1017/aog.2016.17 unknown Cambridge University Press Annals of Glaciology ?? The Author(s) 2016 This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited. CC-BY 24 19 Science & Technology Physical Sciences Geography Physical Geosciences Multidisciplinary Physical Geography Geology basal hydrology ice dynamics radio-echo sounding sediments WEDDELL SEA SECTOR THWAITES GLACIER EAST ANTARCTICA SHEET BED BENEATH ONSET CRYOSAT-2 SURFACE Meteorology & Atmospheric Sciences 0401 Atmospheric Sciences 0404 Geophysics 0406 Physical Geography And Environmental Geoscience Journal Article 2016 ftimperialcol https://doi.org/10.1017/aog.2016.17 2018-09-16T05:54:28Z 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 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 East Antarctica Ice Sheet Institute Ice Stream Thwaites Glacier Weddell Sea West Antarctica Imperial College London: Spiral East 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) Thwaites Glacier ENVELOPE(-106.750,-106.750,-75.500,-75.500) Weddell Weddell Sea West Antarctica Annals of Glaciology 57 73 19 24 |
institution |
Open Polar |
collection |
Imperial College London: Spiral |
op_collection_id |
ftimperialcol |
language |
unknown |
topic |
Science & Technology Physical Sciences Geography Physical Geosciences Multidisciplinary Physical Geography Geology basal hydrology ice dynamics radio-echo sounding sediments WEDDELL SEA SECTOR THWAITES GLACIER EAST ANTARCTICA SHEET BED BENEATH ONSET CRYOSAT-2 SURFACE Meteorology & Atmospheric Sciences 0401 Atmospheric Sciences 0404 Geophysics 0406 Physical Geography And Environmental Geoscience |
spellingShingle |
Science & Technology Physical Sciences Geography Physical Geosciences Multidisciplinary Physical Geography Geology basal hydrology ice dynamics radio-echo sounding sediments WEDDELL SEA SECTOR THWAITES GLACIER EAST ANTARCTICA SHEET BED BENEATH ONSET CRYOSAT-2 SURFACE Meteorology & Atmospheric Sciences 0401 Atmospheric Sciences 0404 Geophysics 0406 Physical Geography And Environmental Geoscience Siegert, MJ Ross, N Li, J Schroeder, DM Rippin, D Ashmore, D Bingham, R Gogineni, P Subglacial controls on the flow of Institute Ice Stream, West Antarctica |
topic_facet |
Science & Technology Physical Sciences Geography Physical Geosciences Multidisciplinary Physical Geography Geology basal hydrology ice dynamics radio-echo sounding sediments WEDDELL SEA SECTOR THWAITES GLACIER EAST ANTARCTICA SHEET BED BENEATH ONSET CRYOSAT-2 SURFACE Meteorology & Atmospheric Sciences 0401 Atmospheric Sciences 0404 Geophysics 0406 Physical Geography And Environmental Geoscience |
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 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. |
author2 |
Natural Environment Research Council (NERC) |
format |
Article in Journal/Newspaper |
author |
Siegert, MJ Ross, N Li, J Schroeder, DM Rippin, D Ashmore, D Bingham, R Gogineni, P |
author_facet |
Siegert, MJ Ross, N Li, J Schroeder, DM Rippin, D Ashmore, D Bingham, R Gogineni, P |
author_sort |
Siegert, MJ |
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 |
http://hdl.handle.net/10044/1/30606 https://doi.org/10.1017/aog.2016.17 |
long_lat |
ENVELOPE(-75.000,-75.000,-82.000,-82.000) ENVELOPE(-75.000,-75.000,-82.000,-82.000) ENVELOPE(-106.750,-106.750,-75.500,-75.500) |
geographic |
East Antarctica Institute Ice Stream Robin Subglacial Basin Thwaites Glacier Weddell Weddell Sea West Antarctica |
geographic_facet |
East Antarctica Institute Ice Stream Robin Subglacial Basin Thwaites Glacier Weddell Weddell Sea West Antarctica |
genre |
Annals of Glaciology Antarc* Antarctica East Antarctica Ice Sheet Institute Ice Stream Thwaites Glacier Weddell Sea West Antarctica |
genre_facet |
Annals of Glaciology Antarc* Antarctica East Antarctica Ice Sheet Institute Ice Stream Thwaites Glacier Weddell Sea West Antarctica |
op_source |
24 19 |
op_relation |
Annals of Glaciology |
op_rights |
?? The Author(s) 2016 This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited. |
op_rightsnorm |
CC-BY |
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_ |
1765998439211991040 |