Origin and dynamic significance of longitudinal structures ("flow stripes") in the Antarctic Ice Sheet
Longitudinal ice-surface structures in the Antarctic Ice Sheet can be traced continuously down-ice for distances of up to 1200 km. A map of the distribution of ~ 3600 of these features, compiled from satellite images, shows that they mirror the location of fast-flowing glaciers and ice streams that...
Published in: | Earth Surface Dynamics |
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Copernicus Publications
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00012015 2023-05-15T13:34:49+02:00 Origin and dynamic significance of longitudinal structures ("flow stripes") in the Antarctic Ice Sheet Glasser, N. F. Jennings, S. J. A. Hambrey, M. J. Hubbard, B. 2015-04 electronic https://doi.org/10.5194/esurf-3-239-2015 https://noa.gwlb.de/receive/cop_mods_00012015 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00011972/esurf-3-239-2015.pdf https://esurf.copernicus.org/articles/3/239/2015/esurf-3-239-2015.pdf eng eng Copernicus Publications Earth Surface Dynamics -- http://www.earth-surf-dynam.net/ -- http://www.bibliothek.uni-regensburg.de/ezeit/?2736054 -- 2196-632X https://doi.org/10.5194/esurf-3-239-2015 https://noa.gwlb.de/receive/cop_mods_00012015 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00011972/esurf-3-239-2015.pdf https://esurf.copernicus.org/articles/3/239/2015/esurf-3-239-2015.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2015 ftnonlinearchiv https://doi.org/10.5194/esurf-3-239-2015 2022-02-08T22:56:15Z Longitudinal ice-surface structures in the Antarctic Ice Sheet can be traced continuously down-ice for distances of up to 1200 km. A map of the distribution of ~ 3600 of these features, compiled from satellite images, shows that they mirror the location of fast-flowing glaciers and ice streams that are dominated by basal sliding rates above tens of metres per annum and are strongly guided by subglacial topography. Longitudinal ice-surface structures dominate regions of converging flow, where ice flow is subject to non-coaxial strain and simple shear. They can be traced continuously through crevasse fields and through blue-ice areas, indicating that they represent the surface manifestation of a three-dimensional structure, interpreted as foliation. Flow lines are linear and undeformed for all major flow units described here in the Antarctic Ice Sheet except for the Kamb Ice Stream and the Institute and Möller Ice Stream areas, where areas of flow perturbation are evident. Parcels of ice along individual flow paths on the Lambert Glacier, Recovery Glacier, Byrd Glacier and Pine Island Glacier may reside in the glacier system for ~ 2500 to 18 500 years. Although it is unclear how long it takes for these features to form and decay, we infer that the major ice-flow configuration of the ice sheet may have remained largely unchanged for the last few hundred years, and possibly even longer. This conclusion has implications for our understanding of the long-term landscape evolution of Antarctica, including large-scale patterns of glacial erosion and deposition. Article in Journal/Newspaper Antarc* Antarctic Antarctica Byrd Glacier Ice Sheet Kamb Ice Stream Lambert Glacier Möller Ice Stream Pine Island Pine Island Glacier Recovery Glacier Niedersächsisches Online-Archiv NOA Antarctic Byrd Byrd Glacier ENVELOPE(160.333,160.333,-80.250,-80.250) Kamb Ice Stream ENVELOPE(-145.000,-145.000,-82.250,-82.250) Lambert Glacier ENVELOPE(67.490,67.490,-73.065,-73.065) Möller Ice Stream ENVELOPE(-63.000,-63.000,-82.000,-82.000) Pine Island Glacier ENVELOPE(-101.000,-101.000,-75.000,-75.000) Recovery Glacier ENVELOPE(-25.500,-25.500,-81.166,-81.166) The Antarctic Earth Surface Dynamics 3 2 239 249 |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Glasser, N. F. Jennings, S. J. A. Hambrey, M. J. Hubbard, B. Origin and dynamic significance of longitudinal structures ("flow stripes") in the Antarctic Ice Sheet |
topic_facet |
article Verlagsveröffentlichung |
description |
Longitudinal ice-surface structures in the Antarctic Ice Sheet can be traced continuously down-ice for distances of up to 1200 km. A map of the distribution of ~ 3600 of these features, compiled from satellite images, shows that they mirror the location of fast-flowing glaciers and ice streams that are dominated by basal sliding rates above tens of metres per annum and are strongly guided by subglacial topography. Longitudinal ice-surface structures dominate regions of converging flow, where ice flow is subject to non-coaxial strain and simple shear. They can be traced continuously through crevasse fields and through blue-ice areas, indicating that they represent the surface manifestation of a three-dimensional structure, interpreted as foliation. Flow lines are linear and undeformed for all major flow units described here in the Antarctic Ice Sheet except for the Kamb Ice Stream and the Institute and Möller Ice Stream areas, where areas of flow perturbation are evident. Parcels of ice along individual flow paths on the Lambert Glacier, Recovery Glacier, Byrd Glacier and Pine Island Glacier may reside in the glacier system for ~ 2500 to 18 500 years. Although it is unclear how long it takes for these features to form and decay, we infer that the major ice-flow configuration of the ice sheet may have remained largely unchanged for the last few hundred years, and possibly even longer. This conclusion has implications for our understanding of the long-term landscape evolution of Antarctica, including large-scale patterns of glacial erosion and deposition. |
format |
Article in Journal/Newspaper |
author |
Glasser, N. F. Jennings, S. J. A. Hambrey, M. J. Hubbard, B. |
author_facet |
Glasser, N. F. Jennings, S. J. A. Hambrey, M. J. Hubbard, B. |
author_sort |
Glasser, N. F. |
title |
Origin and dynamic significance of longitudinal structures ("flow stripes") in the Antarctic Ice Sheet |
title_short |
Origin and dynamic significance of longitudinal structures ("flow stripes") in the Antarctic Ice Sheet |
title_full |
Origin and dynamic significance of longitudinal structures ("flow stripes") in the Antarctic Ice Sheet |
title_fullStr |
Origin and dynamic significance of longitudinal structures ("flow stripes") in the Antarctic Ice Sheet |
title_full_unstemmed |
Origin and dynamic significance of longitudinal structures ("flow stripes") in the Antarctic Ice Sheet |
title_sort |
origin and dynamic significance of longitudinal structures ("flow stripes") in the antarctic ice sheet |
publisher |
Copernicus Publications |
publishDate |
2015 |
url |
https://doi.org/10.5194/esurf-3-239-2015 https://noa.gwlb.de/receive/cop_mods_00012015 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00011972/esurf-3-239-2015.pdf https://esurf.copernicus.org/articles/3/239/2015/esurf-3-239-2015.pdf |
long_lat |
ENVELOPE(160.333,160.333,-80.250,-80.250) ENVELOPE(-145.000,-145.000,-82.250,-82.250) ENVELOPE(67.490,67.490,-73.065,-73.065) ENVELOPE(-63.000,-63.000,-82.000,-82.000) ENVELOPE(-101.000,-101.000,-75.000,-75.000) ENVELOPE(-25.500,-25.500,-81.166,-81.166) |
geographic |
Antarctic Byrd Byrd Glacier Kamb Ice Stream Lambert Glacier Möller Ice Stream Pine Island Glacier Recovery Glacier The Antarctic |
geographic_facet |
Antarctic Byrd Byrd Glacier Kamb Ice Stream Lambert Glacier Möller Ice Stream Pine Island Glacier Recovery Glacier The Antarctic |
genre |
Antarc* Antarctic Antarctica Byrd Glacier Ice Sheet Kamb Ice Stream Lambert Glacier Möller Ice Stream Pine Island Pine Island Glacier Recovery Glacier |
genre_facet |
Antarc* Antarctic Antarctica Byrd Glacier Ice Sheet Kamb Ice Stream Lambert Glacier Möller Ice Stream Pine Island Pine Island Glacier Recovery Glacier |
op_relation |
Earth Surface Dynamics -- http://www.earth-surf-dynam.net/ -- http://www.bibliothek.uni-regensburg.de/ezeit/?2736054 -- 2196-632X https://doi.org/10.5194/esurf-3-239-2015 https://noa.gwlb.de/receive/cop_mods_00012015 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00011972/esurf-3-239-2015.pdf https://esurf.copernicus.org/articles/3/239/2015/esurf-3-239-2015.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/esurf-3-239-2015 |
container_title |
Earth Surface Dynamics |
container_volume |
3 |
container_issue |
2 |
container_start_page |
239 |
op_container_end_page |
249 |
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1766057792017268736 |