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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ftdoajarticles:oai:doaj.org/article:a50a7a59a89a42f5a431ad96b0921199 2023-05-15T14:02:00+02:00 Sheet, stream, and shelf flow as progressive ice-bed uncoupling: Byrd Glacier, Antarctica and Jakobshavn Isbrae, Greenland T. Hughes A. Sargent J. Fastook K. Purdon J. Li J.-B. Yan S. Gogineni 2016-01-01T00:00:00Z https://doi.org/10.5194/tc-10-193-2016 https://doaj.org/article/a50a7a59a89a42f5a431ad96b0921199 EN eng Copernicus Publications http://www.the-cryosphere.net/10/193/2016/tc-10-193-2016.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-10-193-2016 https://doaj.org/article/a50a7a59a89a42f5a431ad96b0921199 The Cryosphere, Vol 10, Iss 1, Pp 193-225 (2016) Environmental sciences GE1-350 Geology QE1-996.5 article 2016 ftdoajarticles https://doi.org/10.5194/tc-10-193-2016 2022-12-31T16:03:59Z 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 Directory of Open Access Journals: DOAJ Articles Byrd Byrd Glacier ENVELOPE(160.333,160.333,-80.250,-80.250) Greenland The Cryosphere 10 1 193 225 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 T. Hughes A. Sargent J. Fastook K. Purdon J. Li J.-B. Yan S. Gogineni Sheet, stream, and shelf flow as progressive ice-bed uncoupling: Byrd Glacier, Antarctica and Jakobshavn Isbrae, Greenland |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
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 |
T. Hughes A. Sargent J. Fastook K. Purdon J. Li J.-B. Yan S. Gogineni |
author_facet |
T. Hughes A. Sargent J. Fastook K. Purdon J. Li J.-B. Yan S. Gogineni |
author_sort |
T. Hughes |
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://doaj.org/article/a50a7a59a89a42f5a431ad96b0921199 |
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_source |
The Cryosphere, Vol 10, Iss 1, Pp 193-225 (2016) |
op_relation |
http://www.the-cryosphere.net/10/193/2016/tc-10-193-2016.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-10-193-2016 https://doaj.org/article/a50a7a59a89a42f5a431ad96b0921199 |
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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1766272059486240768 |