Drivers of abrupt Holocene shifts in West Antarctic ice stream direction determined from combined ice sheet modelling and geologic signatures
Abstract 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 cons...
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crcambridgeupr:10.1017/s0954102014000613 2024-04-28T08:00:09+00:00 Drivers of abrupt Holocene shifts in West Antarctic ice stream direction determined from combined ice sheet modelling and geologic signatures Fogwill, C.J. Turney, C.S.M. Golledge, N.R. Rood, D.H. Hippe, K. Wacker, L. Wieler, R. Rainsley, E.B. Jones, R.S. 2014 http://dx.doi.org/10.1017/s0954102014000613 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102014000613 en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by/3.0/ Antarctic Science volume 26, issue 6, page 674-686 ISSN 0954-1020 1365-2079 Geology Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2014 crcambridgeupr https://doi.org/10.1017/s0954102014000613 2024-04-09T06:55:10Z Abstract 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 situ 14 C and 10 Be 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 Cambridge University Press Antarctic Science 26 6 674 686 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Geology Ecology, Evolution, Behavior and Systematics Oceanography Fogwill, C.J. Turney, C.S.M. Golledge, N.R. Rood, D.H. Hippe, K. Wacker, L. Wieler, R. Rainsley, E.B. Jones, R.S. Drivers of abrupt Holocene shifts in West Antarctic ice stream direction determined from combined ice sheet modelling and geologic signatures |
topic_facet |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract 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 situ 14 C and 10 Be 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, C.J. Turney, C.S.M. Golledge, N.R. Rood, D.H. Hippe, K. Wacker, L. Wieler, R. Rainsley, E.B. Jones, R.S. |
author_facet |
Fogwill, C.J. Turney, C.S.M. Golledge, N.R. Rood, D.H. Hippe, K. Wacker, L. Wieler, R. Rainsley, E.B. Jones, R.S. |
author_sort |
Fogwill, C.J. |
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 (CUP) |
publishDate |
2014 |
url |
http://dx.doi.org/10.1017/s0954102014000613 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102014000613 |
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 |
Antarctic Science volume 26, issue 6, page 674-686 ISSN 0954-1020 1365-2079 |
op_rights |
http://creativecommons.org/licenses/by/3.0/ |
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 |
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1797572511497453568 |