Modeling the dynamic response of outlet glaciers to observed ice-shelf thinning in the Bellingshausen Sea Sector, West Antarctica
Satellite observations of gravity anomalies, ice-surface elevation and glacier velocity show significant increases in net grounded-ice-mass loss over the past decade along the Bellingshausen Sea sector (BSS), West Antarctica, in areas where warm (>1°C) sea water floods the continental shelf. Thes...
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International Glaciological Society
2018
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Online Access: | https://nrl.northumbria.ac.uk/id/eprint/34440/ https://doi.org/10.1017/jog.2018.24 https://nrl.northumbria.ac.uk/id/eprint/34440/1/Minchew%20et%20al%20-%20Modeling%20the%20dynamic%20response%20of%20outlet%20glaciers%20to%20observed%20ice-shelf%20thinning%20in%20the%20Bellingshausen%20Sea%20Sector,%20West%20Antarctica%20OA.pdf |
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ftunivnorthumb:oai:nrl.northumbria.ac.uk:34440 2023-05-15T13:56:54+02:00 Modeling the dynamic response of outlet glaciers to observed ice-shelf thinning in the Bellingshausen Sea Sector, West Antarctica Minchew, Brent M. Gudmundsson, Hilmar Gardner, Alex S. Paolo, Fernando S. Fricker, Helen A. 2018-04-01 text https://nrl.northumbria.ac.uk/id/eprint/34440/ https://doi.org/10.1017/jog.2018.24 https://nrl.northumbria.ac.uk/id/eprint/34440/1/Minchew%20et%20al%20-%20Modeling%20the%20dynamic%20response%20of%20outlet%20glaciers%20to%20observed%20ice-shelf%20thinning%20in%20the%20Bellingshausen%20Sea%20Sector,%20West%20Antarctica%20OA.pdf en eng International Glaciological Society https://nrl.northumbria.ac.uk/id/eprint/34440/1/Minchew%20et%20al%20-%20Modeling%20the%20dynamic%20response%20of%20outlet%20glaciers%20to%20observed%20ice-shelf%20thinning%20in%20the%20Bellingshausen%20Sea%20Sector,%20West%20Antarctica%20OA.pdf Minchew, Brent M., Gudmundsson, Hilmar, Gardner, Alex S., Paolo, Fernando S. and Fricker, Helen A. (2018) Modeling the dynamic response of outlet glaciers to observed ice-shelf thinning in the Bellingshausen Sea Sector, West Antarctica. Journal of Glaciology, 64 (244). pp. 333-342. ISSN 0022-1430 cc_by_4_0 CC-BY F800 Physical and Terrestrial Geographical and Environmental Sciences Article PeerReviewed 2018 ftunivnorthumb https://doi.org/10.1017/jog.2018.24 2022-09-25T06:07:21Z Satellite observations of gravity anomalies, ice-surface elevation and glacier velocity show significant increases in net grounded-ice-mass loss over the past decade along the Bellingshausen Sea sector (BSS), West Antarctica, in areas where warm (>1°C) sea water floods the continental shelf. These observations provide compelling but indirect evidence that mass losses are driven primarily by reduced buttressing from the floating ice shelves caused by ocean-driven ice-shelf thinning. Here, we combine recent observations of ice velocity, thickness and thickness changes with an ice flow model to study the instantaneous dynamic response of BSS outlet glaciers to observed ice-shelf thinning, alone. Our model results show that multiple BSS outlet glaciers respond instantaneously to observed ice-shelf thinning, particularly in areas where ice shelves ground at discrete points. Increases in modeled and observed dynamic mass losses, however, account for ~5% of the mass loss rates estimated from gravity anomalies and changes in ice-surface elevation, suggesting that variations in surface mass balance may be key to understanding recent BSS mass loss. Our approach isolates the impact of ice-shelf thinning on glacier flow and shows that if ice-shelf thinning continues at or above current rates, total BSS mass loss will increase in the next decade. Article in Journal/Newspaper Antarc* Antarctica Antarctica Journal Bellingshausen Sea Ice Shelf Ice Shelves Journal of Glaciology West Antarctica Northumbria University, Newcastle: Northumbria Research Link (NRL) Bellingshausen Sea West Antarctica Journal of Glaciology 64 244 333 342 |
institution |
Open Polar |
collection |
Northumbria University, Newcastle: Northumbria Research Link (NRL) |
op_collection_id |
ftunivnorthumb |
language |
English |
topic |
F800 Physical and Terrestrial Geographical and Environmental Sciences |
spellingShingle |
F800 Physical and Terrestrial Geographical and Environmental Sciences Minchew, Brent M. Gudmundsson, Hilmar Gardner, Alex S. Paolo, Fernando S. Fricker, Helen A. Modeling the dynamic response of outlet glaciers to observed ice-shelf thinning in the Bellingshausen Sea Sector, West Antarctica |
topic_facet |
F800 Physical and Terrestrial Geographical and Environmental Sciences |
description |
Satellite observations of gravity anomalies, ice-surface elevation and glacier velocity show significant increases in net grounded-ice-mass loss over the past decade along the Bellingshausen Sea sector (BSS), West Antarctica, in areas where warm (>1°C) sea water floods the continental shelf. These observations provide compelling but indirect evidence that mass losses are driven primarily by reduced buttressing from the floating ice shelves caused by ocean-driven ice-shelf thinning. Here, we combine recent observations of ice velocity, thickness and thickness changes with an ice flow model to study the instantaneous dynamic response of BSS outlet glaciers to observed ice-shelf thinning, alone. Our model results show that multiple BSS outlet glaciers respond instantaneously to observed ice-shelf thinning, particularly in areas where ice shelves ground at discrete points. Increases in modeled and observed dynamic mass losses, however, account for ~5% of the mass loss rates estimated from gravity anomalies and changes in ice-surface elevation, suggesting that variations in surface mass balance may be key to understanding recent BSS mass loss. Our approach isolates the impact of ice-shelf thinning on glacier flow and shows that if ice-shelf thinning continues at or above current rates, total BSS mass loss will increase in the next decade. |
format |
Article in Journal/Newspaper |
author |
Minchew, Brent M. Gudmundsson, Hilmar Gardner, Alex S. Paolo, Fernando S. Fricker, Helen A. |
author_facet |
Minchew, Brent M. Gudmundsson, Hilmar Gardner, Alex S. Paolo, Fernando S. Fricker, Helen A. |
author_sort |
Minchew, Brent M. |
title |
Modeling the dynamic response of outlet glaciers to observed ice-shelf thinning in the Bellingshausen Sea Sector, West Antarctica |
title_short |
Modeling the dynamic response of outlet glaciers to observed ice-shelf thinning in the Bellingshausen Sea Sector, West Antarctica |
title_full |
Modeling the dynamic response of outlet glaciers to observed ice-shelf thinning in the Bellingshausen Sea Sector, West Antarctica |
title_fullStr |
Modeling the dynamic response of outlet glaciers to observed ice-shelf thinning in the Bellingshausen Sea Sector, West Antarctica |
title_full_unstemmed |
Modeling the dynamic response of outlet glaciers to observed ice-shelf thinning in the Bellingshausen Sea Sector, West Antarctica |
title_sort |
modeling the dynamic response of outlet glaciers to observed ice-shelf thinning in the bellingshausen sea sector, west antarctica |
publisher |
International Glaciological Society |
publishDate |
2018 |
url |
https://nrl.northumbria.ac.uk/id/eprint/34440/ https://doi.org/10.1017/jog.2018.24 https://nrl.northumbria.ac.uk/id/eprint/34440/1/Minchew%20et%20al%20-%20Modeling%20the%20dynamic%20response%20of%20outlet%20glaciers%20to%20observed%20ice-shelf%20thinning%20in%20the%20Bellingshausen%20Sea%20Sector,%20West%20Antarctica%20OA.pdf |
geographic |
Bellingshausen Sea West Antarctica |
geographic_facet |
Bellingshausen Sea West Antarctica |
genre |
Antarc* Antarctica Antarctica Journal Bellingshausen Sea Ice Shelf Ice Shelves Journal of Glaciology West Antarctica |
genre_facet |
Antarc* Antarctica Antarctica Journal Bellingshausen Sea Ice Shelf Ice Shelves Journal of Glaciology West Antarctica |
op_relation |
https://nrl.northumbria.ac.uk/id/eprint/34440/1/Minchew%20et%20al%20-%20Modeling%20the%20dynamic%20response%20of%20outlet%20glaciers%20to%20observed%20ice-shelf%20thinning%20in%20the%20Bellingshausen%20Sea%20Sector,%20West%20Antarctica%20OA.pdf Minchew, Brent M., Gudmundsson, Hilmar, Gardner, Alex S., Paolo, Fernando S. and Fricker, Helen A. (2018) Modeling the dynamic response of outlet glaciers to observed ice-shelf thinning in the Bellingshausen Sea Sector, West Antarctica. Journal of Glaciology, 64 (244). pp. 333-342. ISSN 0022-1430 |
op_rights |
cc_by_4_0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1017/jog.2018.24 |
container_title |
Journal of Glaciology |
container_volume |
64 |
container_issue |
244 |
container_start_page |
333 |
op_container_end_page |
342 |
_version_ |
1766264491543101440 |