Drivers of abrupt Holocene shifts in West Antarctic ice stream direction determined from combined ice sheet modelling and geologic signatures
Determining the millennial-scale behaviour of marine-based sectors of the West Antarctic Ice Sheet (WAIS) is critical to improve predictions of the future contribution of Antarctica to sea level rise. Here high-resolution ice sheet modelling was combined with new terrestrial geological constraints (...
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Cambridge University Press
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Online Access: | http://hdl.handle.net/10044/1/40591 https://doi.org/10.1017/S0954102014000613 |
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ftimperialcol:oai:spiral.imperial.ac.uk:10044/1/40591 2023-05-15T13:51:15+02:00 Drivers of abrupt Holocene shifts in West Antarctic ice stream direction determined from combined ice sheet modelling and geologic signatures Fogwill, CJ Turney, CSM Golledge, NR Rood, DH Hippe, K Wacker, L Wieler, R Rainsley, EB Jones, RS 2014-11-13 http://hdl.handle.net/10044/1/40591 https://doi.org/10.1017/S0954102014000613 unknown Cambridge University Press Antarctic Science © Antarctic Science Ltd 2014. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/3.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited. CC-BY 686 674 Marine Biology & Hydrobiology 05 Environmental Sciences 06 Biological Sciences 04 Earth Sciences Journal Article 2014 ftimperialcol https://doi.org/10.1017/S0954102014000613 2018-09-16T05:57:02Z Determining the millennial-scale behaviour of marine-based sectors of the West Antarctic Ice Sheet (WAIS) is critical to improve predictions of the future contribution of Antarctica to sea level rise. Here high-resolution ice sheet modelling was combined with new terrestrial geological constraints (in situ14C and 10Be analysis) to reconstruct the evolution of two major ice streams entering the Weddell Sea over 20 000 years. The results demonstrate how marked differences in ice flux at the marine margin of the expanded Antarctic ice sheet led to a major reorganization of ice streams in the Weddell Sea during the last deglaciation, resulting in the eastward migration of the Institute Ice Stream, triggering a significant regional change in ice sheet mass balance during the early to mid Holocene. The findings highlight how spatial variability in ice flow can cause marked changes in the pattern, flux and flow direction of ice streams on millennial timescales in this marine ice sheet setting. Given that this sector of the WAIS is assumed to be sensitive to ocean-forced instability and may be influenced by predicted twenty-first century ocean warming, our ability to model and predict abrupt and extensive ice stream diversions is key to a realistic assessment of future ice sheet sensitivity. Article in Journal/Newspaper Antarc* Antarctic Antarctic Science Antarctica Ice Sheet Institute Ice Stream Weddell Sea Imperial College London: Spiral Antarctic Institute Ice Stream ENVELOPE(-75.000,-75.000,-82.000,-82.000) Weddell Weddell Sea West Antarctic Ice Sheet Antarctic Science 26 6 674 686 |
institution |
Open Polar |
collection |
Imperial College London: Spiral |
op_collection_id |
ftimperialcol |
language |
unknown |
topic |
Marine Biology & Hydrobiology 05 Environmental Sciences 06 Biological Sciences 04 Earth Sciences |
spellingShingle |
Marine Biology & Hydrobiology 05 Environmental Sciences 06 Biological Sciences 04 Earth Sciences Fogwill, CJ Turney, CSM Golledge, NR Rood, DH Hippe, K Wacker, L Wieler, R Rainsley, EB Jones, RS Drivers of abrupt Holocene shifts in West Antarctic ice stream direction determined from combined ice sheet modelling and geologic signatures |
topic_facet |
Marine Biology & Hydrobiology 05 Environmental Sciences 06 Biological Sciences 04 Earth Sciences |
description |
Determining the millennial-scale behaviour of marine-based sectors of the West Antarctic Ice Sheet (WAIS) is critical to improve predictions of the future contribution of Antarctica to sea level rise. Here high-resolution ice sheet modelling was combined with new terrestrial geological constraints (in situ14C and 10Be analysis) to reconstruct the evolution of two major ice streams entering the Weddell Sea over 20 000 years. The results demonstrate how marked differences in ice flux at the marine margin of the expanded Antarctic ice sheet led to a major reorganization of ice streams in the Weddell Sea during the last deglaciation, resulting in the eastward migration of the Institute Ice Stream, triggering a significant regional change in ice sheet mass balance during the early to mid Holocene. The findings highlight how spatial variability in ice flow can cause marked changes in the pattern, flux and flow direction of ice streams on millennial timescales in this marine ice sheet setting. Given that this sector of the WAIS is assumed to be sensitive to ocean-forced instability and may be influenced by predicted twenty-first century ocean warming, our ability to model and predict abrupt and extensive ice stream diversions is key to a realistic assessment of future ice sheet sensitivity. |
format |
Article in Journal/Newspaper |
author |
Fogwill, CJ Turney, CSM Golledge, NR Rood, DH Hippe, K Wacker, L Wieler, R Rainsley, EB Jones, RS |
author_facet |
Fogwill, CJ Turney, CSM Golledge, NR Rood, DH Hippe, K Wacker, L Wieler, R Rainsley, EB Jones, RS |
author_sort |
Fogwill, CJ |
title |
Drivers of abrupt Holocene shifts in West Antarctic ice stream direction determined from combined ice sheet modelling and geologic signatures |
title_short |
Drivers of abrupt Holocene shifts in West Antarctic ice stream direction determined from combined ice sheet modelling and geologic signatures |
title_full |
Drivers of abrupt Holocene shifts in West Antarctic ice stream direction determined from combined ice sheet modelling and geologic signatures |
title_fullStr |
Drivers of abrupt Holocene shifts in West Antarctic ice stream direction determined from combined ice sheet modelling and geologic signatures |
title_full_unstemmed |
Drivers of abrupt Holocene shifts in West Antarctic ice stream direction determined from combined ice sheet modelling and geologic signatures |
title_sort |
drivers of abrupt holocene shifts in west antarctic ice stream direction determined from combined ice sheet modelling and geologic signatures |
publisher |
Cambridge University Press |
publishDate |
2014 |
url |
http://hdl.handle.net/10044/1/40591 https://doi.org/10.1017/S0954102014000613 |
long_lat |
ENVELOPE(-75.000,-75.000,-82.000,-82.000) |
geographic |
Antarctic Institute Ice Stream Weddell Weddell Sea West Antarctic Ice Sheet |
geographic_facet |
Antarctic Institute Ice Stream Weddell Weddell Sea West Antarctic Ice Sheet |
genre |
Antarc* Antarctic Antarctic Science Antarctica Ice Sheet Institute Ice Stream Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Science Antarctica Ice Sheet Institute Ice Stream Weddell Sea |
op_source |
686 674 |
op_relation |
Antarctic Science |
op_rights |
© Antarctic Science Ltd 2014. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/3.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1017/S0954102014000613 |
container_title |
Antarctic Science |
container_volume |
26 |
container_issue |
6 |
container_start_page |
674 |
op_container_end_page |
686 |
_version_ |
1766255012465344512 |