Subglacial hydrological control on flow of an Antarctic Peninsula palaeo-ice stream
Basal hydrological systems play an important role in controlling the dynamic behaviour of ice streams. Data showing their morphology and relationship to geological substrates beneath modern ice streams are, however, sparse and difficult to collect. We present new multibeam bathymetry data that make...
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ftcopernicus:oai:publications.copernicus.org:tc73402 2023-05-15T13:55:28+02:00 Subglacial hydrological control on flow of an Antarctic Peninsula palaeo-ice stream Larter, Robert D. Hogan, Kelly A. Hillenbrand, Claus-Dieter Smith, James A. Batchelor, Christine L. Cartigny, Matthieu Tate, Alex J. Kirkham, James D. Roseby, Zoë A. Kuhn, Gerhard Graham, Alastair G. C. Dowdeswell, Julian A. 2019-06-05 application/pdf https://doi.org/10.5194/tc-13-1583-2019 https://tc.copernicus.org/articles/13/1583/2019/ eng eng doi:10.5194/tc-13-1583-2019 https://tc.copernicus.org/articles/13/1583/2019/ eISSN: 1994-0424 Text 2019 ftcopernicus https://doi.org/10.5194/tc-13-1583-2019 2020-07-20T16:22:48Z Basal hydrological systems play an important role in controlling the dynamic behaviour of ice streams. Data showing their morphology and relationship to geological substrates beneath modern ice streams are, however, sparse and difficult to collect. We present new multibeam bathymetry data that make the Anvers-Hugo Trough west of the Antarctic Peninsula the most completely surveyed palaeo-ice stream pathway in Antarctica. The data reveal a diverse range of landforms, including streamlined features where there was fast flow in the palaeo-ice stream, channels eroded by flow of subglacial water, and compelling evidence of palaeo-ice stream shear margin locations. We interpret landforms as indicating that subglacial water availability played an important role in facilitating ice stream flow and controlling shear margin positions. Water was likely supplied to the ice stream bed episodically as a result of outbursts from a subglacial lake located in the Palmer Deep basin on the inner continental shelf. These interpretations have implications for controls on the onset of fast ice flow, the dynamic behaviour of palaeo-ice streams on the Antarctic continental shelf, and potentially also for behaviour of modern ice streams. Text Antarc* Antarctic Antarctic Peninsula Antarctica Copernicus Publications: E-Journals Antarctic Antarctic Peninsula Anvers ENVELOPE(-63.500,-63.500,-64.600,-64.600) Palmer Deep ENVELOPE(-64.400,-64.400,-64.950,-64.950) The Antarctic The Cryosphere 13 6 1583 1596 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
Basal hydrological systems play an important role in controlling the dynamic behaviour of ice streams. Data showing their morphology and relationship to geological substrates beneath modern ice streams are, however, sparse and difficult to collect. We present new multibeam bathymetry data that make the Anvers-Hugo Trough west of the Antarctic Peninsula the most completely surveyed palaeo-ice stream pathway in Antarctica. The data reveal a diverse range of landforms, including streamlined features where there was fast flow in the palaeo-ice stream, channels eroded by flow of subglacial water, and compelling evidence of palaeo-ice stream shear margin locations. We interpret landforms as indicating that subglacial water availability played an important role in facilitating ice stream flow and controlling shear margin positions. Water was likely supplied to the ice stream bed episodically as a result of outbursts from a subglacial lake located in the Palmer Deep basin on the inner continental shelf. These interpretations have implications for controls on the onset of fast ice flow, the dynamic behaviour of palaeo-ice streams on the Antarctic continental shelf, and potentially also for behaviour of modern ice streams. |
format |
Text |
author |
Larter, Robert D. Hogan, Kelly A. Hillenbrand, Claus-Dieter Smith, James A. Batchelor, Christine L. Cartigny, Matthieu Tate, Alex J. Kirkham, James D. Roseby, Zoë A. Kuhn, Gerhard Graham, Alastair G. C. Dowdeswell, Julian A. |
spellingShingle |
Larter, Robert D. Hogan, Kelly A. Hillenbrand, Claus-Dieter Smith, James A. Batchelor, Christine L. Cartigny, Matthieu Tate, Alex J. Kirkham, James D. Roseby, Zoë A. Kuhn, Gerhard Graham, Alastair G. C. Dowdeswell, Julian A. Subglacial hydrological control on flow of an Antarctic Peninsula palaeo-ice stream |
author_facet |
Larter, Robert D. Hogan, Kelly A. Hillenbrand, Claus-Dieter Smith, James A. Batchelor, Christine L. Cartigny, Matthieu Tate, Alex J. Kirkham, James D. Roseby, Zoë A. Kuhn, Gerhard Graham, Alastair G. C. Dowdeswell, Julian A. |
author_sort |
Larter, Robert D. |
title |
Subglacial hydrological control on flow of an Antarctic Peninsula palaeo-ice stream |
title_short |
Subglacial hydrological control on flow of an Antarctic Peninsula palaeo-ice stream |
title_full |
Subglacial hydrological control on flow of an Antarctic Peninsula palaeo-ice stream |
title_fullStr |
Subglacial hydrological control on flow of an Antarctic Peninsula palaeo-ice stream |
title_full_unstemmed |
Subglacial hydrological control on flow of an Antarctic Peninsula palaeo-ice stream |
title_sort |
subglacial hydrological control on flow of an antarctic peninsula palaeo-ice stream |
publishDate |
2019 |
url |
https://doi.org/10.5194/tc-13-1583-2019 https://tc.copernicus.org/articles/13/1583/2019/ |
long_lat |
ENVELOPE(-63.500,-63.500,-64.600,-64.600) ENVELOPE(-64.400,-64.400,-64.950,-64.950) |
geographic |
Antarctic Antarctic Peninsula Anvers Palmer Deep The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Anvers Palmer Deep The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-13-1583-2019 https://tc.copernicus.org/articles/13/1583/2019/ |
op_doi |
https://doi.org/10.5194/tc-13-1583-2019 |
container_title |
The Cryosphere |
container_volume |
13 |
container_issue |
6 |
container_start_page |
1583 |
op_container_end_page |
1596 |
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1766262113487028224 |