Antarctic ice-sheet loss driven by basal melting of ice shelves
Accurate prediction of global sea-level rise requires that we understand the cause of recent, widespread and intensifying1,2 glacier acceleration along Antarctic ice-sheet coastal margins3. Atmospheric and oceanic forcing have the potential to reduce the thickness and extent of floating ice shelves,...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/257449 2023-11-12T04:08:12+01:00 Antarctic ice-sheet loss driven by basal melting of ice shelves Pritchard, H.D. Ligtenberg, S.R.M. Fricker, H.A. Vaughan, D.G. van den Broeke, M.R. Padman, L. Marine and Atmospheric Research Sub Dynamics Meteorology 2012 text/plain https://dspace.library.uu.nl/handle/1874/257449 en eng 0028-0836 https://dspace.library.uu.nl/handle/1874/257449 info:eu-repo/semantics/OpenAccess Article 2012 ftunivutrecht 2023-11-01T23:12:06Z Accurate prediction of global sea-level rise requires that we understand the cause of recent, widespread and intensifying1,2 glacier acceleration along Antarctic ice-sheet coastal margins3. Atmospheric and oceanic forcing have the potential to reduce the thickness and extent of floating ice shelves, potentially limiting their ability to buttress the flow of grounded tributary glaciers4. Indeed, recent ice-shelf collapse led to retreat and acceleration of several glaciers on the Antarctic Peninsula5. But the extent and magnitude of ice-shelf thickness change, the underlying causes of such change, and its link to glacier flow rate are so poorly understood that its future impact on the ice sheets cannot yet be predicted3. Here we use satellite laser altimetry and modelling of the surface firn layer to reveal the circum-Antarctic pattern of ice-shelf thinning through increased basal melt. We deduce that this increased melt is the primary control of Antarctic ice-sheet loss, through a reduction in buttressing of the adjacent ice sheet leading to accelerated glacier flow2. The highest thinning rates occur where warm water at depth can access thick ice shelves via submarine troughs crossing the continental shelf. Wind forcing could explain the dominant patterns of both basal melting and the surface melting and collapse of Antarctic ice shelves, through ocean upwelling in the Amundsen6 and Bellingshausen7 seas, and atmospheric warming on the Antarctic Peninsula8. This implies that climate forcing through changing winds influences Antarctic ice-sheet mass balance, and hence global sea level, on annual to decadal timescales. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Ice Shelf Ice Shelves Utrecht University Repository Antarctic Buttress ENVELOPE(-57.083,-57.083,-63.550,-63.550) The Antarctic |
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Open Polar |
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Utrecht University Repository |
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ftunivutrecht |
language |
English |
description |
Accurate prediction of global sea-level rise requires that we understand the cause of recent, widespread and intensifying1,2 glacier acceleration along Antarctic ice-sheet coastal margins3. Atmospheric and oceanic forcing have the potential to reduce the thickness and extent of floating ice shelves, potentially limiting their ability to buttress the flow of grounded tributary glaciers4. Indeed, recent ice-shelf collapse led to retreat and acceleration of several glaciers on the Antarctic Peninsula5. But the extent and magnitude of ice-shelf thickness change, the underlying causes of such change, and its link to glacier flow rate are so poorly understood that its future impact on the ice sheets cannot yet be predicted3. Here we use satellite laser altimetry and modelling of the surface firn layer to reveal the circum-Antarctic pattern of ice-shelf thinning through increased basal melt. We deduce that this increased melt is the primary control of Antarctic ice-sheet loss, through a reduction in buttressing of the adjacent ice sheet leading to accelerated glacier flow2. The highest thinning rates occur where warm water at depth can access thick ice shelves via submarine troughs crossing the continental shelf. Wind forcing could explain the dominant patterns of both basal melting and the surface melting and collapse of Antarctic ice shelves, through ocean upwelling in the Amundsen6 and Bellingshausen7 seas, and atmospheric warming on the Antarctic Peninsula8. This implies that climate forcing through changing winds influences Antarctic ice-sheet mass balance, and hence global sea level, on annual to decadal timescales. |
author2 |
Marine and Atmospheric Research Sub Dynamics Meteorology |
format |
Article in Journal/Newspaper |
author |
Pritchard, H.D. Ligtenberg, S.R.M. Fricker, H.A. Vaughan, D.G. van den Broeke, M.R. Padman, L. |
spellingShingle |
Pritchard, H.D. Ligtenberg, S.R.M. Fricker, H.A. Vaughan, D.G. van den Broeke, M.R. Padman, L. Antarctic ice-sheet loss driven by basal melting of ice shelves |
author_facet |
Pritchard, H.D. Ligtenberg, S.R.M. Fricker, H.A. Vaughan, D.G. van den Broeke, M.R. Padman, L. |
author_sort |
Pritchard, H.D. |
title |
Antarctic ice-sheet loss driven by basal melting of ice shelves |
title_short |
Antarctic ice-sheet loss driven by basal melting of ice shelves |
title_full |
Antarctic ice-sheet loss driven by basal melting of ice shelves |
title_fullStr |
Antarctic ice-sheet loss driven by basal melting of ice shelves |
title_full_unstemmed |
Antarctic ice-sheet loss driven by basal melting of ice shelves |
title_sort |
antarctic ice-sheet loss driven by basal melting of ice shelves |
publishDate |
2012 |
url |
https://dspace.library.uu.nl/handle/1874/257449 |
long_lat |
ENVELOPE(-57.083,-57.083,-63.550,-63.550) |
geographic |
Antarctic Buttress The Antarctic |
geographic_facet |
Antarctic Buttress The Antarctic |
genre |
Antarc* Antarctic Ice Sheet Ice Shelf Ice Shelves |
genre_facet |
Antarc* Antarctic Ice Sheet Ice Shelf Ice Shelves |
op_relation |
0028-0836 https://dspace.library.uu.nl/handle/1874/257449 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782328561689952256 |