The Role of Lateral and Vertical Shear in Tributary Flow toward a West Antarctic Ice Stream
Narrow lateral shear margins are the most distinctive visual feature of the West Antarctic ice streams. Large shear stresses within these layers support the majority of the gravitational driving stress within a fast-flowing ice stream.The present contribution looks upstream, to the tributaries that...
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ftportlandstate:oai:pdxscholar.library.pdx.edu:geology_fac-1020 2023-05-15T13:58:46+02:00 The Role of Lateral and Vertical Shear in Tributary Flow toward a West Antarctic Ice Stream Hulbe, Christina L. Wang, Weili Joughin, Ian R. Siegert, Martin J. 2003-01-01T08:00:00Z application/pdf https://pdxscholar.library.pdx.edu/geology_fac/21 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1020&context=geology_fac unknown PDXScholar https://pdxscholar.library.pdx.edu/geology_fac/21 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1020&context=geology_fac Geology Faculty Publications and Presentations Ice sheets -- Antarctica Glaciers -- Antarctica Ice sheets -- Mathematical models Ice shelves -- Antarctica Geology Glaciology text 2003 ftportlandstate 2022-01-09T19:24:25Z Narrow lateral shear margins are the most distinctive visual feature of the West Antarctic ice streams. Large shear stresses within these layers support the majority of the gravitational driving stress within a fast-flowing ice stream.The present contribution looks upstream, to the tributaries that feed ice-stream onsets, and considers the effects of both horizontal and vertical shear on their flow. Numerical and direct simulations of vertical and horizontal shear are used.Vertical shear, simulated using an anisotropic flow law, is of particular interest.We conclude that by isolating overlying ice from large-amplitude variations in bed elevation -vertical shear margins - play an important role in sustaining relatively rapid tributary flow. Text Antarc* Antarctic Antarctica Ice Shelves Portland State University: PDXScholar Antarctic |
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Open Polar |
collection |
Portland State University: PDXScholar |
op_collection_id |
ftportlandstate |
language |
unknown |
topic |
Ice sheets -- Antarctica Glaciers -- Antarctica Ice sheets -- Mathematical models Ice shelves -- Antarctica Geology Glaciology |
spellingShingle |
Ice sheets -- Antarctica Glaciers -- Antarctica Ice sheets -- Mathematical models Ice shelves -- Antarctica Geology Glaciology Hulbe, Christina L. Wang, Weili Joughin, Ian R. Siegert, Martin J. The Role of Lateral and Vertical Shear in Tributary Flow toward a West Antarctic Ice Stream |
topic_facet |
Ice sheets -- Antarctica Glaciers -- Antarctica Ice sheets -- Mathematical models Ice shelves -- Antarctica Geology Glaciology |
description |
Narrow lateral shear margins are the most distinctive visual feature of the West Antarctic ice streams. Large shear stresses within these layers support the majority of the gravitational driving stress within a fast-flowing ice stream.The present contribution looks upstream, to the tributaries that feed ice-stream onsets, and considers the effects of both horizontal and vertical shear on their flow. Numerical and direct simulations of vertical and horizontal shear are used.Vertical shear, simulated using an anisotropic flow law, is of particular interest.We conclude that by isolating overlying ice from large-amplitude variations in bed elevation -vertical shear margins - play an important role in sustaining relatively rapid tributary flow. |
format |
Text |
author |
Hulbe, Christina L. Wang, Weili Joughin, Ian R. Siegert, Martin J. |
author_facet |
Hulbe, Christina L. Wang, Weili Joughin, Ian R. Siegert, Martin J. |
author_sort |
Hulbe, Christina L. |
title |
The Role of Lateral and Vertical Shear in Tributary Flow toward a West Antarctic Ice Stream |
title_short |
The Role of Lateral and Vertical Shear in Tributary Flow toward a West Antarctic Ice Stream |
title_full |
The Role of Lateral and Vertical Shear in Tributary Flow toward a West Antarctic Ice Stream |
title_fullStr |
The Role of Lateral and Vertical Shear in Tributary Flow toward a West Antarctic Ice Stream |
title_full_unstemmed |
The Role of Lateral and Vertical Shear in Tributary Flow toward a West Antarctic Ice Stream |
title_sort |
role of lateral and vertical shear in tributary flow toward a west antarctic ice stream |
publisher |
PDXScholar |
publishDate |
2003 |
url |
https://pdxscholar.library.pdx.edu/geology_fac/21 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1020&context=geology_fac |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctica Ice Shelves |
genre_facet |
Antarc* Antarctic Antarctica Ice Shelves |
op_source |
Geology Faculty Publications and Presentations |
op_relation |
https://pdxscholar.library.pdx.edu/geology_fac/21 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1020&context=geology_fac |
_version_ |
1766267099836055552 |