Spatial patterns of basal drag inferred using control methods from a full-Stokes and simpler models for Pine Island Glacier, West Antarctica
Basal drag is a fundamental control on ice stream dynamics that remains poorly understood or constrained by observations. Here, we apply control methods on ice surface velocities of Pine Island Glacier, West Antarctica to infer the spatial pattern of basal drag using a full-Stokes (FS) model of ice...
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ftcdlib:qt8x35n9nw 2023-05-15T13:50:53+02:00 Spatial patterns of basal drag inferred using control methods from a full-Stokes and simpler models for Pine Island Glacier, West Antarctica Morlighem, M Rignot, E Seroussi, H Larour, E Ben Dhia, H Aubry, D 2010-07-01 application/pdf http://www.escholarship.org/uc/item/8x35n9nw english eng eScholarship, University of California qt8x35n9nw http://www.escholarship.org/uc/item/8x35n9nw Attribution (CC BY): http://creativecommons.org/licenses/by/3.0/ CC-BY Morlighem, M; Rignot, E; Seroussi, H; Larour, E; Ben Dhia, H; & Aubry, D. (2010). Spatial patterns of basal drag inferred using control methods from a full-Stokes and simpler models for Pine Island Glacier, West Antarctica. Geophysical Research Letters, 37(14). doi:10.1029/2010GL043853. UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/8x35n9nw article 2010 ftcdlib https://doi.org/10.1029/2010GL043853 2018-07-13T22:52:46Z Basal drag is a fundamental control on ice stream dynamics that remains poorly understood or constrained by observations. Here, we apply control methods on ice surface velocities of Pine Island Glacier, West Antarctica to infer the spatial pattern of basal drag using a full-Stokes (FS) model of ice flow and compare the results obtained with two commonly-used simplified solutions: the MacAyeal shelfy stream model and the Blatter-Pattyn model. Over most of the model domain, the three models yield similar patterns of basal drag, yet near the glacier grounding-line, the simplified models yield high basal drag while FS yields almost no basal drag. The simplified models overestimate basal drag because they neglect bridging effects in an ice stream region of rapidly varying ice thickness. This result reinforces theoretical studies that a FS treatment of ice flow is essential near glacier grounding lines. © 2010 by the American Geophysical Union. Article in Journal/Newspaper Antarc* Antarctica Pine Island Pine Island Glacier West Antarctica University of California: eScholarship Pine Island Glacier ENVELOPE(-101.000,-101.000,-75.000,-75.000) West Antarctica Geophysical Research Letters 37 14 n/a n/a |
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Open Polar |
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University of California: eScholarship |
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ftcdlib |
language |
English |
description |
Basal drag is a fundamental control on ice stream dynamics that remains poorly understood or constrained by observations. Here, we apply control methods on ice surface velocities of Pine Island Glacier, West Antarctica to infer the spatial pattern of basal drag using a full-Stokes (FS) model of ice flow and compare the results obtained with two commonly-used simplified solutions: the MacAyeal shelfy stream model and the Blatter-Pattyn model. Over most of the model domain, the three models yield similar patterns of basal drag, yet near the glacier grounding-line, the simplified models yield high basal drag while FS yields almost no basal drag. The simplified models overestimate basal drag because they neglect bridging effects in an ice stream region of rapidly varying ice thickness. This result reinforces theoretical studies that a FS treatment of ice flow is essential near glacier grounding lines. © 2010 by the American Geophysical Union. |
format |
Article in Journal/Newspaper |
author |
Morlighem, M Rignot, E Seroussi, H Larour, E Ben Dhia, H Aubry, D |
spellingShingle |
Morlighem, M Rignot, E Seroussi, H Larour, E Ben Dhia, H Aubry, D Spatial patterns of basal drag inferred using control methods from a full-Stokes and simpler models for Pine Island Glacier, West Antarctica |
author_facet |
Morlighem, M Rignot, E Seroussi, H Larour, E Ben Dhia, H Aubry, D |
author_sort |
Morlighem, M |
title |
Spatial patterns of basal drag inferred using control methods from a full-Stokes and simpler models for Pine Island Glacier, West Antarctica |
title_short |
Spatial patterns of basal drag inferred using control methods from a full-Stokes and simpler models for Pine Island Glacier, West Antarctica |
title_full |
Spatial patterns of basal drag inferred using control methods from a full-Stokes and simpler models for Pine Island Glacier, West Antarctica |
title_fullStr |
Spatial patterns of basal drag inferred using control methods from a full-Stokes and simpler models for Pine Island Glacier, West Antarctica |
title_full_unstemmed |
Spatial patterns of basal drag inferred using control methods from a full-Stokes and simpler models for Pine Island Glacier, West Antarctica |
title_sort |
spatial patterns of basal drag inferred using control methods from a full-stokes and simpler models for pine island glacier, west antarctica |
publisher |
eScholarship, University of California |
publishDate |
2010 |
url |
http://www.escholarship.org/uc/item/8x35n9nw |
long_lat |
ENVELOPE(-101.000,-101.000,-75.000,-75.000) |
geographic |
Pine Island Glacier West Antarctica |
geographic_facet |
Pine Island Glacier West Antarctica |
genre |
Antarc* Antarctica Pine Island Pine Island Glacier West Antarctica |
genre_facet |
Antarc* Antarctica Pine Island Pine Island Glacier West Antarctica |
op_source |
Morlighem, M; Rignot, E; Seroussi, H; Larour, E; Ben Dhia, H; & Aubry, D. (2010). Spatial patterns of basal drag inferred using control methods from a full-Stokes and simpler models for Pine Island Glacier, West Antarctica. Geophysical Research Letters, 37(14). doi:10.1029/2010GL043853. UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/8x35n9nw |
op_relation |
qt8x35n9nw http://www.escholarship.org/uc/item/8x35n9nw |
op_rights |
Attribution (CC BY): http://creativecommons.org/licenses/by/3.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2010GL043853 |
container_title |
Geophysical Research Letters |
container_volume |
37 |
container_issue |
14 |
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n/a |
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n/a |
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1766254255926149120 |