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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Cambridge University Press
2018
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ftdoajarticles:oai:doaj.org/article:a49c313a77c94603a8523575c03694b6 2023-05-15T14:13:29+02:00 Modeling the dynamic response of outlet glaciers to observed ice-shelf thinning in the Bellingshausen Sea Sector, West Antarctica BRENT M. MINCHEW G. HILMAR GUDMUNDSSON ALEX S. GARDNER FERNANDO S. PAOLO HELEN A. FRICKER 2018-04-01T00:00:00Z https://doi.org/10.1017/jog.2018.24 https://doaj.org/article/a49c313a77c94603a8523575c03694b6 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143018000242/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2018.24 0022-1430 1727-5652 https://doaj.org/article/a49c313a77c94603a8523575c03694b6 Journal of Glaciology, Vol 64, Pp 333-342 (2018) glacier flow glacier modeling glaciological model experiments ice–ocean interactions ice shelves Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2018 ftdoajarticles https://doi.org/10.1017/jog.2018.24 2023-03-12T01:30:59Z 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 Bellingshausen Sea Ice Shelf Ice Shelves Journal of Glaciology West Antarctica Directory of Open Access Journals: DOAJ Articles Bellingshausen Sea West Antarctica Journal of Glaciology 64 244 333 342 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
glacier flow glacier modeling glaciological model experiments ice–ocean interactions ice shelves Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
glacier flow glacier modeling glaciological model experiments ice–ocean interactions ice shelves Environmental sciences GE1-350 Meteorology. Climatology QC851-999 BRENT M. MINCHEW G. HILMAR GUDMUNDSSON ALEX S. GARDNER FERNANDO S. PAOLO HELEN A. FRICKER Modeling the dynamic response of outlet glaciers to observed ice-shelf thinning in the Bellingshausen Sea Sector, West Antarctica |
topic_facet |
glacier flow glacier modeling glaciological model experiments ice–ocean interactions ice shelves Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
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 |
BRENT M. MINCHEW G. HILMAR GUDMUNDSSON ALEX S. GARDNER FERNANDO S. PAOLO HELEN A. FRICKER |
author_facet |
BRENT M. MINCHEW G. HILMAR GUDMUNDSSON ALEX S. GARDNER FERNANDO S. PAOLO HELEN A. FRICKER |
author_sort |
BRENT M. MINCHEW |
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 |
Cambridge University Press |
publishDate |
2018 |
url |
https://doi.org/10.1017/jog.2018.24 https://doaj.org/article/a49c313a77c94603a8523575c03694b6 |
geographic |
Bellingshausen Sea West Antarctica |
geographic_facet |
Bellingshausen Sea West Antarctica |
genre |
Antarc* Antarctica Bellingshausen Sea Ice Shelf Ice Shelves Journal of Glaciology West Antarctica |
genre_facet |
Antarc* Antarctica Bellingshausen Sea Ice Shelf Ice Shelves Journal of Glaciology West Antarctica |
op_source |
Journal of Glaciology, Vol 64, Pp 333-342 (2018) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143018000242/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2018.24 0022-1430 1727-5652 https://doaj.org/article/a49c313a77c94603a8523575c03694b6 |
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_ |
1766285960472952832 |