Ice-flow reorganization within the East Antarctic Ice Sheet deep interior
Near the South Pole, a large subglacial lake exists beneath the East Antarctic Ice Sheet less than 10 km from where the bed temperature is inferred to be −9°C. A thermodynamic model was used to investigate the apparent contradiction of basal water existing in the vicinity of a cold bed. Model result...
Published in: | Geological Society, London, Special Publications |
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Online Access: | http://hdl.handle.net/10044/1/49919 https://doi.org/10.1144/SP461.14 |
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ftimperialcol:oai:spiral.imperial.ac.uk:10044/1/49919 2023-05-15T13:54:42+02:00 Ice-flow reorganization within the East Antarctic Ice Sheet deep interior Beem, LH Cavitte, MGP Blankenship, DD Carter, SP Young, DA Muldoon, GR Jackson, CS Siegert, MJ British Council (UK) 2017-07-04 http://hdl.handle.net/10044/1/49919 https://doi.org/10.1144/SP461.14 unknown Geological Society Special Publication - Geological Society of London © 2017 The Author(s). Published by The Geological Society of London. All rights reserved. 04 Earth Sciences Geochemistry & Geophysics Journal Article 2017 ftimperialcol https://doi.org/10.1144/SP461.14 2018-09-16T05:59:47Z Near the South Pole, a large subglacial lake exists beneath the East Antarctic Ice Sheet less than 10 km from where the bed temperature is inferred to be −9°C. A thermodynamic model was used to investigate the apparent contradiction of basal water existing in the vicinity of a cold bed. Model results indicate that South Pole Lake is freezing and that neither present-day geothermal flux nor ice flow is capable of producing the necessary heat to sustain basal water at this location. We hypothesize that the lake comprises relict water formed during a different configuration of ice dynamics when significant frictional heating from ice sliding was available. Additional modelling of assumed basal sliding shows frictional heating was capable of producing the necessary heat to fill South Pole Lake. Independent evidence of englacial structures measured by airborne radar revel ice-sheet flow was more dynamic in the past. Ice sliding is estimated to have ceased between 16.8 and 10.7 ka based on an ice chronology from a nearby borehole. These findings reveal major post-Last Glacial Maximum ice-dynamic change within the interior of East Antarctica, demonstrating that the present interior ice flow is different than that under full glacial conditions. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Sheet South pole South pole Imperial College London: Spiral Antarctic East Antarctic Ice Sheet East Antarctica Pole Lake ENVELOPE(-100.645,-100.645,56.802,56.802) South Pole Geological Society, London, Special Publications 461 1 35 47 |
institution |
Open Polar |
collection |
Imperial College London: Spiral |
op_collection_id |
ftimperialcol |
language |
unknown |
topic |
04 Earth Sciences Geochemistry & Geophysics |
spellingShingle |
04 Earth Sciences Geochemistry & Geophysics Beem, LH Cavitte, MGP Blankenship, DD Carter, SP Young, DA Muldoon, GR Jackson, CS Siegert, MJ Ice-flow reorganization within the East Antarctic Ice Sheet deep interior |
topic_facet |
04 Earth Sciences Geochemistry & Geophysics |
description |
Near the South Pole, a large subglacial lake exists beneath the East Antarctic Ice Sheet less than 10 km from where the bed temperature is inferred to be −9°C. A thermodynamic model was used to investigate the apparent contradiction of basal water existing in the vicinity of a cold bed. Model results indicate that South Pole Lake is freezing and that neither present-day geothermal flux nor ice flow is capable of producing the necessary heat to sustain basal water at this location. We hypothesize that the lake comprises relict water formed during a different configuration of ice dynamics when significant frictional heating from ice sliding was available. Additional modelling of assumed basal sliding shows frictional heating was capable of producing the necessary heat to fill South Pole Lake. Independent evidence of englacial structures measured by airborne radar revel ice-sheet flow was more dynamic in the past. Ice sliding is estimated to have ceased between 16.8 and 10.7 ka based on an ice chronology from a nearby borehole. These findings reveal major post-Last Glacial Maximum ice-dynamic change within the interior of East Antarctica, demonstrating that the present interior ice flow is different than that under full glacial conditions. |
author2 |
British Council (UK) |
format |
Article in Journal/Newspaper |
author |
Beem, LH Cavitte, MGP Blankenship, DD Carter, SP Young, DA Muldoon, GR Jackson, CS Siegert, MJ |
author_facet |
Beem, LH Cavitte, MGP Blankenship, DD Carter, SP Young, DA Muldoon, GR Jackson, CS Siegert, MJ |
author_sort |
Beem, LH |
title |
Ice-flow reorganization within the East Antarctic Ice Sheet deep interior |
title_short |
Ice-flow reorganization within the East Antarctic Ice Sheet deep interior |
title_full |
Ice-flow reorganization within the East Antarctic Ice Sheet deep interior |
title_fullStr |
Ice-flow reorganization within the East Antarctic Ice Sheet deep interior |
title_full_unstemmed |
Ice-flow reorganization within the East Antarctic Ice Sheet deep interior |
title_sort |
ice-flow reorganization within the east antarctic ice sheet deep interior |
publisher |
Geological Society |
publishDate |
2017 |
url |
http://hdl.handle.net/10044/1/49919 https://doi.org/10.1144/SP461.14 |
long_lat |
ENVELOPE(-100.645,-100.645,56.802,56.802) |
geographic |
Antarctic East Antarctic Ice Sheet East Antarctica Pole Lake South Pole |
geographic_facet |
Antarctic East Antarctic Ice Sheet East Antarctica Pole Lake South Pole |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet South pole South pole |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet South pole South pole |
op_relation |
Special Publication - Geological Society of London |
op_rights |
© 2017 The Author(s). Published by The Geological Society of London. All rights reserved. |
op_doi |
https://doi.org/10.1144/SP461.14 |
container_title |
Geological Society, London, Special Publications |
container_volume |
461 |
container_issue |
1 |
container_start_page |
35 |
op_container_end_page |
47 |
_version_ |
1766260778754637824 |