Ice-Bed Coupling Beneath and Beyond Ice Streams: Byrd Glacier, Antarctica
Ice sheet thickness is determined mainly by the strength of ice-bed coupling that controls holistic transitions from slow sheet flow to fast streamflow to buttressing shelf flow. Byrd Glacier has the largest ice drainage system in Antarctica and is the fastest ice stream entering Ross Ice Shelf. In...
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ftmaineuniv:oai:digitalcommons.library.umaine.edu:ers_facpub-1048 2023-05-15T13:53:51+02:00 Ice-Bed Coupling Beneath and Beyond Ice Streams: Byrd Glacier, Antarctica Hughes, Terence J. Sargent, Aitbala Fastook, James L. 2011-07-28T07:00:00Z application/pdf https://digitalcommons.library.umaine.edu/ers_facpub/49 https://digitalcommons.library.umaine.edu/cgi/viewcontent.cgi?article=1048&context=ers_facpub unknown DigitalCommons@UMaine https://digitalcommons.library.umaine.edu/ers_facpub/49 https://digitalcommons.library.umaine.edu/cgi/viewcontent.cgi?article=1048&context=ers_facpub This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. In addition, no permission is required from the rights-holder(s) for educational uses. For other uses, you need to obtain permission from the rights-holder(s). Earth Science Faculty Scholarship Earth Sciences text 2011 ftmaineuniv 2023-03-12T18:49:12Z Ice sheet thickness is determined mainly by the strength of ice-bed coupling that controls holistic transitions from slow sheet flow to fast streamflow to buttressing shelf flow. Byrd Glacier has the largest ice drainage system in Antarctica and is the fastest ice stream entering Ross Ice Shelf. In 2004 two large subglacial lakes at the head of Byrd Glacier suddenly drained and increased the terminal ice velocity of Byrd Glacier from 820 m yr(-1) to 900 m yr(-1). This resulted in partial ice-bed recoupling above the lakes and partial decoupling along Byrd Glacier. An attempt to quantify this behavior is made using flowband and flowline models in which the controlling variable for ice height above the bed is the floating fraction phi of ice along the flowband and flowline. Changes in phi before and after drainage are obtained from available data, but more reliable data in the map plane are required before Byrd Glacier can be modeled adequately. A holistic sliding velocity is derived that depends on phi, with contributions from ice shearing over coupled beds and ice stretching over uncoupled beds, as is done in state-of-the-art sliding theories. Text Antarc* Antarctica Byrd Glacier Ice Sheet Ice Shelf Ross Ice Shelf The University of Maine: DigitalCommons@UMaine Byrd Byrd Glacier ENVELOPE(160.333,160.333,-80.250,-80.250) Ross Ice Shelf |
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Open Polar |
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The University of Maine: DigitalCommons@UMaine |
op_collection_id |
ftmaineuniv |
language |
unknown |
topic |
Earth Sciences |
spellingShingle |
Earth Sciences Hughes, Terence J. Sargent, Aitbala Fastook, James L. Ice-Bed Coupling Beneath and Beyond Ice Streams: Byrd Glacier, Antarctica |
topic_facet |
Earth Sciences |
description |
Ice sheet thickness is determined mainly by the strength of ice-bed coupling that controls holistic transitions from slow sheet flow to fast streamflow to buttressing shelf flow. Byrd Glacier has the largest ice drainage system in Antarctica and is the fastest ice stream entering Ross Ice Shelf. In 2004 two large subglacial lakes at the head of Byrd Glacier suddenly drained and increased the terminal ice velocity of Byrd Glacier from 820 m yr(-1) to 900 m yr(-1). This resulted in partial ice-bed recoupling above the lakes and partial decoupling along Byrd Glacier. An attempt to quantify this behavior is made using flowband and flowline models in which the controlling variable for ice height above the bed is the floating fraction phi of ice along the flowband and flowline. Changes in phi before and after drainage are obtained from available data, but more reliable data in the map plane are required before Byrd Glacier can be modeled adequately. A holistic sliding velocity is derived that depends on phi, with contributions from ice shearing over coupled beds and ice stretching over uncoupled beds, as is done in state-of-the-art sliding theories. |
format |
Text |
author |
Hughes, Terence J. Sargent, Aitbala Fastook, James L. |
author_facet |
Hughes, Terence J. Sargent, Aitbala Fastook, James L. |
author_sort |
Hughes, Terence J. |
title |
Ice-Bed Coupling Beneath and Beyond Ice Streams: Byrd Glacier, Antarctica |
title_short |
Ice-Bed Coupling Beneath and Beyond Ice Streams: Byrd Glacier, Antarctica |
title_full |
Ice-Bed Coupling Beneath and Beyond Ice Streams: Byrd Glacier, Antarctica |
title_fullStr |
Ice-Bed Coupling Beneath and Beyond Ice Streams: Byrd Glacier, Antarctica |
title_full_unstemmed |
Ice-Bed Coupling Beneath and Beyond Ice Streams: Byrd Glacier, Antarctica |
title_sort |
ice-bed coupling beneath and beyond ice streams: byrd glacier, antarctica |
publisher |
DigitalCommons@UMaine |
publishDate |
2011 |
url |
https://digitalcommons.library.umaine.edu/ers_facpub/49 https://digitalcommons.library.umaine.edu/cgi/viewcontent.cgi?article=1048&context=ers_facpub |
long_lat |
ENVELOPE(160.333,160.333,-80.250,-80.250) |
geographic |
Byrd Byrd Glacier Ross Ice Shelf |
geographic_facet |
Byrd Byrd Glacier Ross Ice Shelf |
genre |
Antarc* Antarctica Byrd Glacier Ice Sheet Ice Shelf Ross Ice Shelf |
genre_facet |
Antarc* Antarctica Byrd Glacier Ice Sheet Ice Shelf Ross Ice Shelf |
op_source |
Earth Science Faculty Scholarship |
op_relation |
https://digitalcommons.library.umaine.edu/ers_facpub/49 https://digitalcommons.library.umaine.edu/cgi/viewcontent.cgi?article=1048&context=ers_facpub |
op_rights |
This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. In addition, no permission is required from the rights-holder(s) for educational uses. For other uses, you need to obtain permission from the rights-holder(s). |
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1766259320458051584 |