Deglaciation and future stability of the Coats Land ice margin, Antarctica
The East Antarctic Ice Sheet discharges into the Weddell Sea via the Coats Land ice margin. We have used geophysical data to determine the changing ice-sheet configuration in this region through its last glacial advance and Holocene retreat and to identify constraints on its future stability. Method...
Published in: | The Cryosphere |
---|---|
Main Authors: | , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2018
|
Subjects: | |
Online Access: | https://doi.org/10.5194/tc-12-2383-2018 https://www.the-cryosphere.net/12/2383/2018/tc-12-2383-2018.pdf https://doaj.org/article/6fb3275972d0416f9ca7ec2bd12bcb91 |
id |
fttriple:oai:gotriple.eu:oai:doaj.org/article:6fb3275972d0416f9ca7ec2bd12bcb91 |
---|---|
record_format |
openpolar |
spelling |
fttriple:oai:gotriple.eu:oai:doaj.org/article:6fb3275972d0416f9ca7ec2bd12bcb91 2023-05-15T13:43:58+02:00 Deglaciation and future stability of the Coats Land ice margin, Antarctica D. A. Hodgson K. Hogan J. M. Smith J. A. Smith C.-D. Hillenbrand A. G. C. Graham P. Fretwell C. Allen V. Peck J.-E. Arndt B. Dorschel C. Hübscher A. M. Smith R. Larter 2018-07-01 https://doi.org/10.5194/tc-12-2383-2018 https://www.the-cryosphere.net/12/2383/2018/tc-12-2383-2018.pdf https://doaj.org/article/6fb3275972d0416f9ca7ec2bd12bcb91 en eng Copernicus Publications doi:10.5194/tc-12-2383-2018 1994-0416 1994-0424 https://www.the-cryosphere.net/12/2383/2018/tc-12-2383-2018.pdf https://doaj.org/article/6fb3275972d0416f9ca7ec2bd12bcb91 undefined The Cryosphere, Vol 12, Pp 2383-2399 (2018) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2018 fttriple https://doi.org/10.5194/tc-12-2383-2018 2023-01-22T18:58:49Z The East Antarctic Ice Sheet discharges into the Weddell Sea via the Coats Land ice margin. We have used geophysical data to determine the changing ice-sheet configuration in this region through its last glacial advance and Holocene retreat and to identify constraints on its future stability. Methods included high-resolution multibeam bathymetry, sub-bottom profiles, seismic-reflection profiles, sediment core analysis and satellite altimetry. These provide evidence that Coats Land glaciers and ice streams merged with the palaeo-Filchner Ice Stream during the last glacial advance. Retreat of this ice stream from 12 848 to 8351 cal. yr BP resulted in its progressive southwards decoupling from Coats Land outlet glaciers. Moraines and grounding-zone wedges document the subsequent retreat and thinning of these glaciers, their loss of contact with the bed and the formation of ice shelves, which re-advanced to pinning points on topographic highs at the distal end of the troughs. Once fully detached from the bed, these ice shelves were predisposed to rapid retreat back to coastal grounding lines. This was due to reverse-bed slopes, the consequent absence of further pinning points in the troughs and potentially to the loss of structural integrity resulting from weaknesses inherited at the grounding line. These processes explain why there are no large ice shelves in the eastern Weddell Sea between 75.5 and 77° S. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Ice Shelves The Cryosphere Weddell Sea Unknown Antarctic Coats Land ENVELOPE(-27.500,-27.500,-77.000,-77.000) East Antarctic Ice Sheet Weddell Weddell Sea The Cryosphere 12 7 2383 2399 |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
geo envir |
spellingShingle |
geo envir D. A. Hodgson K. Hogan J. M. Smith J. A. Smith C.-D. Hillenbrand A. G. C. Graham P. Fretwell C. Allen V. Peck J.-E. Arndt B. Dorschel C. Hübscher A. M. Smith R. Larter Deglaciation and future stability of the Coats Land ice margin, Antarctica |
topic_facet |
geo envir |
description |
The East Antarctic Ice Sheet discharges into the Weddell Sea via the Coats Land ice margin. We have used geophysical data to determine the changing ice-sheet configuration in this region through its last glacial advance and Holocene retreat and to identify constraints on its future stability. Methods included high-resolution multibeam bathymetry, sub-bottom profiles, seismic-reflection profiles, sediment core analysis and satellite altimetry. These provide evidence that Coats Land glaciers and ice streams merged with the palaeo-Filchner Ice Stream during the last glacial advance. Retreat of this ice stream from 12 848 to 8351 cal. yr BP resulted in its progressive southwards decoupling from Coats Land outlet glaciers. Moraines and grounding-zone wedges document the subsequent retreat and thinning of these glaciers, their loss of contact with the bed and the formation of ice shelves, which re-advanced to pinning points on topographic highs at the distal end of the troughs. Once fully detached from the bed, these ice shelves were predisposed to rapid retreat back to coastal grounding lines. This was due to reverse-bed slopes, the consequent absence of further pinning points in the troughs and potentially to the loss of structural integrity resulting from weaknesses inherited at the grounding line. These processes explain why there are no large ice shelves in the eastern Weddell Sea between 75.5 and 77° S. |
format |
Article in Journal/Newspaper |
author |
D. A. Hodgson K. Hogan J. M. Smith J. A. Smith C.-D. Hillenbrand A. G. C. Graham P. Fretwell C. Allen V. Peck J.-E. Arndt B. Dorschel C. Hübscher A. M. Smith R. Larter |
author_facet |
D. A. Hodgson K. Hogan J. M. Smith J. A. Smith C.-D. Hillenbrand A. G. C. Graham P. Fretwell C. Allen V. Peck J.-E. Arndt B. Dorschel C. Hübscher A. M. Smith R. Larter |
author_sort |
D. A. Hodgson |
title |
Deglaciation and future stability of the Coats Land ice margin, Antarctica |
title_short |
Deglaciation and future stability of the Coats Land ice margin, Antarctica |
title_full |
Deglaciation and future stability of the Coats Land ice margin, Antarctica |
title_fullStr |
Deglaciation and future stability of the Coats Land ice margin, Antarctica |
title_full_unstemmed |
Deglaciation and future stability of the Coats Land ice margin, Antarctica |
title_sort |
deglaciation and future stability of the coats land ice margin, antarctica |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/tc-12-2383-2018 https://www.the-cryosphere.net/12/2383/2018/tc-12-2383-2018.pdf https://doaj.org/article/6fb3275972d0416f9ca7ec2bd12bcb91 |
long_lat |
ENVELOPE(-27.500,-27.500,-77.000,-77.000) |
geographic |
Antarctic Coats Land East Antarctic Ice Sheet Weddell Weddell Sea |
geographic_facet |
Antarctic Coats Land East Antarctic Ice Sheet Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelves The Cryosphere Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelves The Cryosphere Weddell Sea |
op_source |
The Cryosphere, Vol 12, Pp 2383-2399 (2018) |
op_relation |
doi:10.5194/tc-12-2383-2018 1994-0416 1994-0424 https://www.the-cryosphere.net/12/2383/2018/tc-12-2383-2018.pdf https://doaj.org/article/6fb3275972d0416f9ca7ec2bd12bcb91 |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/tc-12-2383-2018 |
container_title |
The Cryosphere |
container_volume |
12 |
container_issue |
7 |
container_start_page |
2383 |
op_container_end_page |
2399 |
_version_ |
1766195537240915968 |