Ice-stream stability on a reverse bed slope
Marine-based ice streams whose beds deepen inland are thought to be inherently unstable¹⁻³. This instability is of particular concern because significant portions of the marine based West Antarctic and Greenland ice sheets are losing mass and their retreat could contribute significantly to future se...
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ftunivzuerich:oai:www.zora.uzh.ch:136082 2024-10-13T14:02:27+00:00 Ice-stream stability on a reverse bed slope Jamieson, Stewart S R Vieli, Andreas Livingstone, Stephen J Cofaigh, Colm Ó Stokes, Chris Hillenbrand, Claus-Dieter Dowdeswell, Julian A 2012 application/pdf https://www.zora.uzh.ch/id/eprint/136082/ https://www.zora.uzh.ch/id/eprint/136082/1/2012_Vieli_ngeo1600.pdf https://doi.org/10.5167/uzh-136082 https://doi.org/10.1038/ngeo1600 eng eng Nature Publishing Group https://www.zora.uzh.ch/id/eprint/136082/1/2012_Vieli_ngeo1600.pdf doi:10.5167/uzh-136082 doi:10.1038/ngeo1600 urn:issn:1752-0894 info:eu-repo/semantics/restrictedAccess Jamieson, Stewart S R; Vieli, Andreas; Livingstone, Stephen J; Cofaigh, Colm Ó; Stokes, Chris; Hillenbrand, Claus-Dieter; Dowdeswell, Julian A (2012). Ice-stream stability on a reverse bed slope. Nature Geoscience, 5(11):799-802. Institute of Geography 910 Geography & travel Journal Article PeerReviewed info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2012 ftunivzuerich https://doi.org/10.5167/uzh-13608210.1038/ngeo1600 2024-09-18T00:49:48Z Marine-based ice streams whose beds deepen inland are thought to be inherently unstable¹⁻³. This instability is of particular concern because significant portions of the marine based West Antarctic and Greenland ice sheets are losing mass and their retreat could contribute significantly to future sea-level rise⁴⁻⁷. However, the present understanding of ice stream stability is limited by observational records that are too short to resolve multi-decadal to millennial-scale behavior or to validate numerical models⁸. Here we present a dynamic numerical simulation of Antarctic ice-stream retreat since the Last Glacial Maximum (LGM), constrained by geophysical data, whose behaviour is consistent with the geomorphological record. We find that retreat of Marguerite Bay Ice Stream following the LGM was highly nonlinear and was interrupted by stabilizations on a reverse-sloping bed, where theory predicts rapid unstable retreat. We demonstrate that these transient stabilizations were caused by enhanced lateral drag as the ice stream narrowed.We conclude that, as well as bed topography, ice-stream width and long-term retreat history are crucial for understanding decadal- to centennial-scale ice-stream behaviour and marine ice-sheet vulnerability. Article in Journal/Newspaper Antarc* Antarctic Greenland Ice Sheet University of Zurich (UZH): ZORA (Zurich Open Repository and Archive Antarctic Greenland Marguerite ENVELOPE(141.378,141.378,-66.787,-66.787) Marguerite Bay ENVELOPE(-68.000,-68.000,-68.500,-68.500) |
institution |
Open Polar |
collection |
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive |
op_collection_id |
ftunivzuerich |
language |
English |
topic |
Institute of Geography 910 Geography & travel |
spellingShingle |
Institute of Geography 910 Geography & travel Jamieson, Stewart S R Vieli, Andreas Livingstone, Stephen J Cofaigh, Colm Ó Stokes, Chris Hillenbrand, Claus-Dieter Dowdeswell, Julian A Ice-stream stability on a reverse bed slope |
topic_facet |
Institute of Geography 910 Geography & travel |
description |
Marine-based ice streams whose beds deepen inland are thought to be inherently unstable¹⁻³. This instability is of particular concern because significant portions of the marine based West Antarctic and Greenland ice sheets are losing mass and their retreat could contribute significantly to future sea-level rise⁴⁻⁷. However, the present understanding of ice stream stability is limited by observational records that are too short to resolve multi-decadal to millennial-scale behavior or to validate numerical models⁸. Here we present a dynamic numerical simulation of Antarctic ice-stream retreat since the Last Glacial Maximum (LGM), constrained by geophysical data, whose behaviour is consistent with the geomorphological record. We find that retreat of Marguerite Bay Ice Stream following the LGM was highly nonlinear and was interrupted by stabilizations on a reverse-sloping bed, where theory predicts rapid unstable retreat. We demonstrate that these transient stabilizations were caused by enhanced lateral drag as the ice stream narrowed.We conclude that, as well as bed topography, ice-stream width and long-term retreat history are crucial for understanding decadal- to centennial-scale ice-stream behaviour and marine ice-sheet vulnerability. |
format |
Article in Journal/Newspaper |
author |
Jamieson, Stewart S R Vieli, Andreas Livingstone, Stephen J Cofaigh, Colm Ó Stokes, Chris Hillenbrand, Claus-Dieter Dowdeswell, Julian A |
author_facet |
Jamieson, Stewart S R Vieli, Andreas Livingstone, Stephen J Cofaigh, Colm Ó Stokes, Chris Hillenbrand, Claus-Dieter Dowdeswell, Julian A |
author_sort |
Jamieson, Stewart S R |
title |
Ice-stream stability on a reverse bed slope |
title_short |
Ice-stream stability on a reverse bed slope |
title_full |
Ice-stream stability on a reverse bed slope |
title_fullStr |
Ice-stream stability on a reverse bed slope |
title_full_unstemmed |
Ice-stream stability on a reverse bed slope |
title_sort |
ice-stream stability on a reverse bed slope |
publisher |
Nature Publishing Group |
publishDate |
2012 |
url |
https://www.zora.uzh.ch/id/eprint/136082/ https://www.zora.uzh.ch/id/eprint/136082/1/2012_Vieli_ngeo1600.pdf https://doi.org/10.5167/uzh-136082 https://doi.org/10.1038/ngeo1600 |
long_lat |
ENVELOPE(141.378,141.378,-66.787,-66.787) ENVELOPE(-68.000,-68.000,-68.500,-68.500) |
geographic |
Antarctic Greenland Marguerite Marguerite Bay |
geographic_facet |
Antarctic Greenland Marguerite Marguerite Bay |
genre |
Antarc* Antarctic Greenland Ice Sheet |
genre_facet |
Antarc* Antarctic Greenland Ice Sheet |
op_source |
Jamieson, Stewart S R; Vieli, Andreas; Livingstone, Stephen J; Cofaigh, Colm Ó; Stokes, Chris; Hillenbrand, Claus-Dieter; Dowdeswell, Julian A (2012). Ice-stream stability on a reverse bed slope. Nature Geoscience, 5(11):799-802. |
op_relation |
https://www.zora.uzh.ch/id/eprint/136082/1/2012_Vieli_ngeo1600.pdf doi:10.5167/uzh-136082 doi:10.1038/ngeo1600 urn:issn:1752-0894 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.5167/uzh-13608210.1038/ngeo1600 |
_version_ |
1812817387360092160 |