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Subglacial hydrological control on flow of an Antarctic Peninsula palaeo-ice stream

Subglacial hydrological control on flow of an Antarctic Peninsula palaeo-ice stream
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 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.

1994-0416
1583-1596
Larter, Robert D.
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Hogan, Kelly A.
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Hillenbrand, Claus Dieter
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Smith, James A.
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Batchelor, Christine L.
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Cartigny, Matthieu
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Tate, Alex J.
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Kirkham, James D.
24517916-3098-4c21-a099-0eb93806be15
Roseby, Zoë A.
c40d5935-51f6-48ea-9b42-57963ebc5e1a
Kuhn, Gerhard
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Graham, Alastair G.C.
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Dowdeswell, Julian A.
106dce8d-e831-4407-b65d-575452be2cb8
Larter, Robert D.
70400ac2-66b6-45c1-8a76-0cc978c3d5af
Hogan, Kelly A.
0c0543b5-302c-49b3-9e31-7af0c0ecb0a2
Hillenbrand, Claus Dieter
8dc0c76e-e79b-4c8f-90ed-07035aabab98
Smith, James A.
d91a77b8-a3f7-4d57-911b-507b5f7e1409
Batchelor, Christine L.
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Cartigny, Matthieu
bda1b79b-7e11-4790-8238-b86d80a88bb3
Tate, Alex J.
74e49214-1424-4387-be62-464175e1cef9
Kirkham, James D.
24517916-3098-4c21-a099-0eb93806be15
Roseby, Zoë A.
c40d5935-51f6-48ea-9b42-57963ebc5e1a
Kuhn, Gerhard
2edba081-db06-4283-bfe2-3b5fae86fb4b
Graham, Alastair G.C.
0043bd2f-103d-4131-8baf-96b6326f394f
Dowdeswell, Julian A.
106dce8d-e831-4407-b65d-575452be2cb8

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. and Dowdeswell, Julian A. (2019) Subglacial hydrological control on flow of an Antarctic Peninsula palaeo-ice stream. The Cryosphere, 13 (6), 1583-1596. (doi:10.5194/tc-13-1583-2019).

Record type: Article

Abstract

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.

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Accepted/In Press date: 29 April 2019
Published date: 5 June 2019

Identifiers

Local EPrints ID: 431984
URI: https://eprints.soton.ac.uk/id/eprint/431984
ISSN: 1994-0416
PURE UUID: bc45dbcd-db59-4d51-91ce-af7071d7a833

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Date deposited: 26 Jun 2019 16:30
Last modified: 02 Dec 2019 17:35

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Contributors

Author: Robert D. Larter
Author: Kelly A. Hogan
Author: Claus Dieter Hillenbrand
Author: James A. Smith
Author: Christine L. Batchelor
Author: Matthieu Cartigny
Author: Alex J. Tate
Author: James D. Kirkham
Author: Zoë A. Roseby
Author: Gerhard Kuhn
Author: Alastair G.C. Graham
Author: Julian A. Dowdeswell

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