Sheet, stream, and shelf flow as progressive ice-bed uncoupling: Byrd Glacier, Antarctica and Jakobshavn Isbrae, Greenland
The first-order control of ice thickness and height above sea level is linked to the decreasing strength of ice-bed coupling along flowlines from an interior ice divide to the calving front of an ice shelf. Uncoupling progresses as a frozen bed progressively thaws for sheet flow, as a thawed bed is...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00014222 2023-05-15T13:41:02+02:00 Sheet, stream, and shelf flow as progressive ice-bed uncoupling: Byrd Glacier, Antarctica and Jakobshavn Isbrae, Greenland Hughes, T. Sargent, A. Fastook, J. Purdon, K. Li, J. Yan, J.-B. Gogineni, S. 2016-01 electronic https://doi.org/10.5194/tc-10-193-2016 https://noa.gwlb.de/receive/cop_mods_00014222 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00014178/tc-10-193-2016.pdf https://tc.copernicus.org/articles/10/193/2016/tc-10-193-2016.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-10-193-2016 https://noa.gwlb.de/receive/cop_mods_00014222 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00014178/tc-10-193-2016.pdf https://tc.copernicus.org/articles/10/193/2016/tc-10-193-2016.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2016 ftnonlinearchiv https://doi.org/10.5194/tc-10-193-2016 2022-02-08T22:55:13Z The first-order control of ice thickness and height above sea level is linked to the decreasing strength of ice-bed coupling along flowlines from an interior ice divide to the calving front of an ice shelf. Uncoupling progresses as a frozen bed progressively thaws for sheet flow, as a thawed bed is progressively drowned for stream flow, and as lateral and/or local grounding vanish for shelf flow. This can reduce ice thicknesses by 90 % and ice elevations by 99 % along flowlines. Original work presented here includes (1) replacing flow and sliding laws for sheet flow with upper and lower yield stresses for creep in cold overlying ice and basal ice sliding over deforming till, respectively, (2) replacing integrating the Navier–Stokes equations for stream flow with geometrical solutions to the force balance, and (3) including resistance to shelf flow caused by lateral confinement in a fjord and local grounding at ice rumples and ice rises. A comparison is made between our approach and two approaches based on continuum mechanics. Applications are made to Byrd Glacier in Antarctica and Jakobshavn Isbrae in Greenland. Article in Journal/Newspaper Antarc* Antarctica Byrd Glacier glacier Greenland Ice Shelf Jakobshavn The Cryosphere Niedersächsisches Online-Archiv NOA Byrd Byrd Glacier ENVELOPE(160.333,160.333,-80.250,-80.250) Greenland The Cryosphere 10 1 193 225 |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Hughes, T. Sargent, A. Fastook, J. Purdon, K. Li, J. Yan, J.-B. Gogineni, S. Sheet, stream, and shelf flow as progressive ice-bed uncoupling: Byrd Glacier, Antarctica and Jakobshavn Isbrae, Greenland |
topic_facet |
article Verlagsveröffentlichung |
description |
The first-order control of ice thickness and height above sea level is linked to the decreasing strength of ice-bed coupling along flowlines from an interior ice divide to the calving front of an ice shelf. Uncoupling progresses as a frozen bed progressively thaws for sheet flow, as a thawed bed is progressively drowned for stream flow, and as lateral and/or local grounding vanish for shelf flow. This can reduce ice thicknesses by 90 % and ice elevations by 99 % along flowlines. Original work presented here includes (1) replacing flow and sliding laws for sheet flow with upper and lower yield stresses for creep in cold overlying ice and basal ice sliding over deforming till, respectively, (2) replacing integrating the Navier–Stokes equations for stream flow with geometrical solutions to the force balance, and (3) including resistance to shelf flow caused by lateral confinement in a fjord and local grounding at ice rumples and ice rises. A comparison is made between our approach and two approaches based on continuum mechanics. Applications are made to Byrd Glacier in Antarctica and Jakobshavn Isbrae in Greenland. |
format |
Article in Journal/Newspaper |
author |
Hughes, T. Sargent, A. Fastook, J. Purdon, K. Li, J. Yan, J.-B. Gogineni, S. |
author_facet |
Hughes, T. Sargent, A. Fastook, J. Purdon, K. Li, J. Yan, J.-B. Gogineni, S. |
author_sort |
Hughes, T. |
title |
Sheet, stream, and shelf flow as progressive ice-bed uncoupling: Byrd Glacier, Antarctica and Jakobshavn Isbrae, Greenland |
title_short |
Sheet, stream, and shelf flow as progressive ice-bed uncoupling: Byrd Glacier, Antarctica and Jakobshavn Isbrae, Greenland |
title_full |
Sheet, stream, and shelf flow as progressive ice-bed uncoupling: Byrd Glacier, Antarctica and Jakobshavn Isbrae, Greenland |
title_fullStr |
Sheet, stream, and shelf flow as progressive ice-bed uncoupling: Byrd Glacier, Antarctica and Jakobshavn Isbrae, Greenland |
title_full_unstemmed |
Sheet, stream, and shelf flow as progressive ice-bed uncoupling: Byrd Glacier, Antarctica and Jakobshavn Isbrae, Greenland |
title_sort |
sheet, stream, and shelf flow as progressive ice-bed uncoupling: byrd glacier, antarctica and jakobshavn isbrae, greenland |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/tc-10-193-2016 https://noa.gwlb.de/receive/cop_mods_00014222 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00014178/tc-10-193-2016.pdf https://tc.copernicus.org/articles/10/193/2016/tc-10-193-2016.pdf |
long_lat |
ENVELOPE(160.333,160.333,-80.250,-80.250) |
geographic |
Byrd Byrd Glacier Greenland |
geographic_facet |
Byrd Byrd Glacier Greenland |
genre |
Antarc* Antarctica Byrd Glacier glacier Greenland Ice Shelf Jakobshavn The Cryosphere |
genre_facet |
Antarc* Antarctica Byrd Glacier glacier Greenland Ice Shelf Jakobshavn The Cryosphere |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-10-193-2016 https://noa.gwlb.de/receive/cop_mods_00014222 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00014178/tc-10-193-2016.pdf https://tc.copernicus.org/articles/10/193/2016/tc-10-193-2016.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-10-193-2016 |
container_title |
The Cryosphere |
container_volume |
10 |
container_issue |
1 |
container_start_page |
193 |
op_container_end_page |
225 |
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1766145067018354688 |