A comparative modeling study of the Brunt Ice Shelf/Stancomb-Wills Ice Tongue system, East Antarctica
Two diagnostic, dynamic/thermodynamic ice-shelf models are applied to the Brunt Ice Shelf/Stancomb-Wills Ice Tongue system, located off Caird Coast, Coats Land, Antarctica. The Brunt Ice Shelf/Stancomb-Wills Ice Tongue system is characterized as a thin, unbounded ice shelf with an atypical and highl...
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Online Access: | http://hdl.handle.net/2115/39262 https://doi.org/10.3189/002214309788608949 |
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/39262 2023-05-15T13:55:39+02:00 A comparative modeling study of the Brunt Ice Shelf/Stancomb-Wills Ice Tongue system, East Antarctica Humbert, Angelika Kleiner, Thomas Mohrholz, Chris-Oliver Oelke, Christoph Greve, Ralf Lange, Manfred A. http://hdl.handle.net/2115/39262 https://doi.org/10.3189/002214309788608949 eng eng International Glaciological Society http://hdl.handle.net/2115/39262 Journal of Glaciology, 55(189): 53-65 http://dx.doi.org/10.3189/002214309788608949 © 2009 International Glaciological Society Ice shelf Modeling Rift Shear margin Antarctica 452 article fthokunivhus https://doi.org/10.3189/002214309788608949 2022-11-18T01:01:51Z Two diagnostic, dynamic/thermodynamic ice-shelf models are applied to the Brunt Ice Shelf/Stancomb-Wills Ice Tongue system, located off Caird Coast, Coats Land, Antarctica. The Brunt Ice Shelf/Stancomb-Wills Ice Tongue system is characterized as a thin, unbounded ice shelf with an atypical and highly heterogeneous structure. In contrast to other ice shelves, a composite mass of icebergs that calved at the grounding line and were then locked within fast (sea) ice exists between the fast-moving Stancomb-Wills Ice Stream and the slow-moving Brunt Ice Shelf. We simulate the present flow regime of the ice shelf that results from the ice-thickness distribution and the inflow at the grounding line with two different models, and compare the model results with feature tracking and InSAR flow velocities. We then incorporate two observed features, a rift and a shear margin, into the models with two different approaches, and demonstrate the effects of variations in numerical values for the shear strength and viscosity in these zones on the simulated velocity field. A major result is that both kinds of implementation of the rifts lead to similar effects on the entire velocity field, while there are discrepancies in the vicinity of the rifts. Article in Journal/Newspaper Antarc* Antarctica Brunt Ice Shelf East Antarctica Ice Shelf Ice Shelves Journal of Glaciology Sea ice Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) East Antarctica Coats Land ENVELOPE(-27.500,-27.500,-77.000,-77.000) Brunt Ice Shelf ENVELOPE(-22.500,-22.500,-74.750,-74.750) Caird ENVELOPE(-24.000,-24.000,-76.000,-76.000) Caird Coast ENVELOPE(-20.000,-20.000,-75.417,-75.417) Stancomb-Wills Ice Stream ENVELOPE(-20.000,-20.000,-75.300,-75.300) Journal of Glaciology 55 189 53 65 |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
Ice shelf Modeling Rift Shear margin Antarctica 452 |
spellingShingle |
Ice shelf Modeling Rift Shear margin Antarctica 452 Humbert, Angelika Kleiner, Thomas Mohrholz, Chris-Oliver Oelke, Christoph Greve, Ralf Lange, Manfred A. A comparative modeling study of the Brunt Ice Shelf/Stancomb-Wills Ice Tongue system, East Antarctica |
topic_facet |
Ice shelf Modeling Rift Shear margin Antarctica 452 |
description |
Two diagnostic, dynamic/thermodynamic ice-shelf models are applied to the Brunt Ice Shelf/Stancomb-Wills Ice Tongue system, located off Caird Coast, Coats Land, Antarctica. The Brunt Ice Shelf/Stancomb-Wills Ice Tongue system is characterized as a thin, unbounded ice shelf with an atypical and highly heterogeneous structure. In contrast to other ice shelves, a composite mass of icebergs that calved at the grounding line and were then locked within fast (sea) ice exists between the fast-moving Stancomb-Wills Ice Stream and the slow-moving Brunt Ice Shelf. We simulate the present flow regime of the ice shelf that results from the ice-thickness distribution and the inflow at the grounding line with two different models, and compare the model results with feature tracking and InSAR flow velocities. We then incorporate two observed features, a rift and a shear margin, into the models with two different approaches, and demonstrate the effects of variations in numerical values for the shear strength and viscosity in these zones on the simulated velocity field. A major result is that both kinds of implementation of the rifts lead to similar effects on the entire velocity field, while there are discrepancies in the vicinity of the rifts. |
format |
Article in Journal/Newspaper |
author |
Humbert, Angelika Kleiner, Thomas Mohrholz, Chris-Oliver Oelke, Christoph Greve, Ralf Lange, Manfred A. |
author_facet |
Humbert, Angelika Kleiner, Thomas Mohrholz, Chris-Oliver Oelke, Christoph Greve, Ralf Lange, Manfred A. |
author_sort |
Humbert, Angelika |
title |
A comparative modeling study of the Brunt Ice Shelf/Stancomb-Wills Ice Tongue system, East Antarctica |
title_short |
A comparative modeling study of the Brunt Ice Shelf/Stancomb-Wills Ice Tongue system, East Antarctica |
title_full |
A comparative modeling study of the Brunt Ice Shelf/Stancomb-Wills Ice Tongue system, East Antarctica |
title_fullStr |
A comparative modeling study of the Brunt Ice Shelf/Stancomb-Wills Ice Tongue system, East Antarctica |
title_full_unstemmed |
A comparative modeling study of the Brunt Ice Shelf/Stancomb-Wills Ice Tongue system, East Antarctica |
title_sort |
comparative modeling study of the brunt ice shelf/stancomb-wills ice tongue system, east antarctica |
publisher |
International Glaciological Society |
url |
http://hdl.handle.net/2115/39262 https://doi.org/10.3189/002214309788608949 |
long_lat |
ENVELOPE(-27.500,-27.500,-77.000,-77.000) ENVELOPE(-22.500,-22.500,-74.750,-74.750) ENVELOPE(-24.000,-24.000,-76.000,-76.000) ENVELOPE(-20.000,-20.000,-75.417,-75.417) ENVELOPE(-20.000,-20.000,-75.300,-75.300) |
geographic |
East Antarctica Coats Land Brunt Ice Shelf Caird Caird Coast Stancomb-Wills Ice Stream |
geographic_facet |
East Antarctica Coats Land Brunt Ice Shelf Caird Caird Coast Stancomb-Wills Ice Stream |
genre |
Antarc* Antarctica Brunt Ice Shelf East Antarctica Ice Shelf Ice Shelves Journal of Glaciology Sea ice |
genre_facet |
Antarc* Antarctica Brunt Ice Shelf East Antarctica Ice Shelf Ice Shelves Journal of Glaciology Sea ice |
op_relation |
http://hdl.handle.net/2115/39262 Journal of Glaciology, 55(189): 53-65 http://dx.doi.org/10.3189/002214309788608949 |
op_rights |
© 2009 International Glaciological Society |
op_doi |
https://doi.org/10.3189/002214309788608949 |
container_title |
Journal of Glaciology |
container_volume |
55 |
container_issue |
189 |
container_start_page |
53 |
op_container_end_page |
65 |
_version_ |
1766262438742720512 |