Ice shelf history determined from deformation styles in surface debris
Abstract This paper presents InSAR-derived ice shelf velocities and observations of surface debris deformation on the McMurdo Ice Shelf (MIS). Ice shelf velocities show that the MIS has a low surface velocity, with debris-laden parts of the ice shelf in the area known as the ‘swirls’ averaging speed...
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Online Access: | http://dx.doi.org/10.1017/s0954102014000376 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102014000376 |
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crcambridgeupr:10.1017/s0954102014000376 2024-03-03T08:39:24+00:00 Ice shelf history determined from deformation styles in surface debris Glasser, Neil F. Holt, Tom Fleming, Ed Stevenson, Carl 2014 http://dx.doi.org/10.1017/s0954102014000376 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102014000376 en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by/3.0/ Antarctic Science volume 26, issue 6, page 661-673 ISSN 0954-1020 1365-2079 Geology Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2014 crcambridgeupr https://doi.org/10.1017/s0954102014000376 2024-02-08T08:26:21Z Abstract This paper presents InSAR-derived ice shelf velocities and observations of surface debris deformation on the McMurdo Ice Shelf (MIS). Ice shelf velocities show that the MIS has a low surface velocity, with debris-laden parts of the ice shelf in the area known as the ‘swirls’ averaging speeds of c . 3 m a -1 increasing to c . 16 m a -1 at the ice front. Analysis of the fold patterns within moraine ridges on the ice surface reveals a deformational history inconsistent with the present velocity measurements. Polyphase, isoclinal folding within moraine ridges at the surface are interpreted to have formed through intense deformation by past ice flow in a NNW orientation. The velocities and styles of deformation indicate that the majority of debris on the ice shelf was originally transported into the area by a large and dynamic ice sheet/ice shelf system entirely different to that of the present configuration. Although the age of this event is unknown, it is possible that this debris has been exposed on the surface of the ice shelf since the last glacial maximum. Article in Journal/Newspaper Antarctic Science Ice Sheet Ice Shelf McMurdo Ice Shelf Cambridge University Press McMurdo Ice Shelf ENVELOPE(166.500,166.500,-78.000,-78.000) Antarctic Science 26 6 661 673 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Geology Ecology, Evolution, Behavior and Systematics Oceanography Glasser, Neil F. Holt, Tom Fleming, Ed Stevenson, Carl Ice shelf history determined from deformation styles in surface debris |
topic_facet |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract This paper presents InSAR-derived ice shelf velocities and observations of surface debris deformation on the McMurdo Ice Shelf (MIS). Ice shelf velocities show that the MIS has a low surface velocity, with debris-laden parts of the ice shelf in the area known as the ‘swirls’ averaging speeds of c . 3 m a -1 increasing to c . 16 m a -1 at the ice front. Analysis of the fold patterns within moraine ridges on the ice surface reveals a deformational history inconsistent with the present velocity measurements. Polyphase, isoclinal folding within moraine ridges at the surface are interpreted to have formed through intense deformation by past ice flow in a NNW orientation. The velocities and styles of deformation indicate that the majority of debris on the ice shelf was originally transported into the area by a large and dynamic ice sheet/ice shelf system entirely different to that of the present configuration. Although the age of this event is unknown, it is possible that this debris has been exposed on the surface of the ice shelf since the last glacial maximum. |
format |
Article in Journal/Newspaper |
author |
Glasser, Neil F. Holt, Tom Fleming, Ed Stevenson, Carl |
author_facet |
Glasser, Neil F. Holt, Tom Fleming, Ed Stevenson, Carl |
author_sort |
Glasser, Neil F. |
title |
Ice shelf history determined from deformation styles in surface debris |
title_short |
Ice shelf history determined from deformation styles in surface debris |
title_full |
Ice shelf history determined from deformation styles in surface debris |
title_fullStr |
Ice shelf history determined from deformation styles in surface debris |
title_full_unstemmed |
Ice shelf history determined from deformation styles in surface debris |
title_sort |
ice shelf history determined from deformation styles in surface debris |
publisher |
Cambridge University Press (CUP) |
publishDate |
2014 |
url |
http://dx.doi.org/10.1017/s0954102014000376 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102014000376 |
long_lat |
ENVELOPE(166.500,166.500,-78.000,-78.000) |
geographic |
McMurdo Ice Shelf |
geographic_facet |
McMurdo Ice Shelf |
genre |
Antarctic Science Ice Sheet Ice Shelf McMurdo Ice Shelf |
genre_facet |
Antarctic Science Ice Sheet Ice Shelf McMurdo Ice Shelf |
op_source |
Antarctic Science volume 26, issue 6, page 661-673 ISSN 0954-1020 1365-2079 |
op_rights |
http://creativecommons.org/licenses/by/3.0/ |
op_doi |
https://doi.org/10.1017/s0954102014000376 |
container_title |
Antarctic Science |
container_volume |
26 |
container_issue |
6 |
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661 |
op_container_end_page |
673 |
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1792494929182720000 |