Direct measurements of ice-shelf flexure caused by surface meltwater ponding and drainage. ...
Global sea-level rise is caused, in part, by more rapid ice discharge from Antarctica, following the removal of the restraining forces of floating ice-shelves after their break-up. A trigger of ice-shelf break-up is thought to be stress variations associated with surface meltwater ponding and draina...
Main Authors: | , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Springer Science and Business Media LLC
2019
|
Subjects: | |
Online Access: | https://dx.doi.org/10.17863/cam.36206 https://www.repository.cam.ac.uk/handle/1810/288943 |
id |
ftdatacite:10.17863/cam.36206 |
---|---|
record_format |
openpolar |
spelling |
ftdatacite:10.17863/cam.36206 2024-02-27T08:35:19+00:00 Direct measurements of ice-shelf flexure caused by surface meltwater ponding and drainage. ... Banwell, Alison F Willis, Ian C Macdonald, Grant J Goodsell, Becky MacAyeal, Douglas R 2019 https://dx.doi.org/10.17863/cam.36206 https://www.repository.cam.ac.uk/handle/1810/288943 en eng Springer Science and Business Media LLC 0406 Physical Geography and Environmental Geoscience article-journal ScholarlyArticle JournalArticle Article 2019 ftdatacite https://doi.org/10.17863/cam.36206 2024-02-01T14:59:36Z Global sea-level rise is caused, in part, by more rapid ice discharge from Antarctica, following the removal of the restraining forces of floating ice-shelves after their break-up. A trigger of ice-shelf break-up is thought to be stress variations associated with surface meltwater ponding and drainage, causing flexure and fracture. But until now, there have been no direct measurements of these processes. Here, we present field data from the McMurdo Ice Shelf, Antarctica, showing that the filling, to ~2 m depth, and subsequent draining, by overflow and channel incision, of four surface lakes causes pronounced and immediate ice-shelf flexure over multiple-week timescales. The magnitude of the vertical ice-shelf deflection reaches maxima of ~1 m at the lake centres, declining to zero at distances of <500 m. Our results should be used to guide development of continent-wide ice-sheet models, which currently do not simulate ice-shelf break-up due to meltwater loading and unloading. ... Article in Journal/Newspaper Antarc* Antarctica Ice Sheet Ice Shelf Ice Shelves McMurdo Ice Shelf DataCite Metadata Store (German National Library of Science and Technology) McMurdo Ice Shelf ENVELOPE(166.500,166.500,-78.000,-78.000) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
0406 Physical Geography and Environmental Geoscience |
spellingShingle |
0406 Physical Geography and Environmental Geoscience Banwell, Alison F Willis, Ian C Macdonald, Grant J Goodsell, Becky MacAyeal, Douglas R Direct measurements of ice-shelf flexure caused by surface meltwater ponding and drainage. ... |
topic_facet |
0406 Physical Geography and Environmental Geoscience |
description |
Global sea-level rise is caused, in part, by more rapid ice discharge from Antarctica, following the removal of the restraining forces of floating ice-shelves after their break-up. A trigger of ice-shelf break-up is thought to be stress variations associated with surface meltwater ponding and drainage, causing flexure and fracture. But until now, there have been no direct measurements of these processes. Here, we present field data from the McMurdo Ice Shelf, Antarctica, showing that the filling, to ~2 m depth, and subsequent draining, by overflow and channel incision, of four surface lakes causes pronounced and immediate ice-shelf flexure over multiple-week timescales. The magnitude of the vertical ice-shelf deflection reaches maxima of ~1 m at the lake centres, declining to zero at distances of <500 m. Our results should be used to guide development of continent-wide ice-sheet models, which currently do not simulate ice-shelf break-up due to meltwater loading and unloading. ... |
format |
Article in Journal/Newspaper |
author |
Banwell, Alison F Willis, Ian C Macdonald, Grant J Goodsell, Becky MacAyeal, Douglas R |
author_facet |
Banwell, Alison F Willis, Ian C Macdonald, Grant J Goodsell, Becky MacAyeal, Douglas R |
author_sort |
Banwell, Alison F |
title |
Direct measurements of ice-shelf flexure caused by surface meltwater ponding and drainage. ... |
title_short |
Direct measurements of ice-shelf flexure caused by surface meltwater ponding and drainage. ... |
title_full |
Direct measurements of ice-shelf flexure caused by surface meltwater ponding and drainage. ... |
title_fullStr |
Direct measurements of ice-shelf flexure caused by surface meltwater ponding and drainage. ... |
title_full_unstemmed |
Direct measurements of ice-shelf flexure caused by surface meltwater ponding and drainage. ... |
title_sort |
direct measurements of ice-shelf flexure caused by surface meltwater ponding and drainage. ... |
publisher |
Springer Science and Business Media LLC |
publishDate |
2019 |
url |
https://dx.doi.org/10.17863/cam.36206 https://www.repository.cam.ac.uk/handle/1810/288943 |
long_lat |
ENVELOPE(166.500,166.500,-78.000,-78.000) |
geographic |
McMurdo Ice Shelf |
geographic_facet |
McMurdo Ice Shelf |
genre |
Antarc* Antarctica Ice Sheet Ice Shelf Ice Shelves McMurdo Ice Shelf |
genre_facet |
Antarc* Antarctica Ice Sheet Ice Shelf Ice Shelves McMurdo Ice Shelf |
op_doi |
https://doi.org/10.17863/cam.36206 |
_version_ |
1792041815938957312 |