Drivers of abrupt Holocene shifts in West Antarctic ice stream direction 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
2014
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Online Access: | http://dro.dur.ac.uk/20225/ http://dro.dur.ac.uk/20225/1/20225.pdf https://doi.org/10.1017/S0954102014000613 |
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ftunivdurham:oai:dro.dur.ac.uk.OAI2:20225 2023-05-15T14:02:14+02:00 Drivers of abrupt Holocene shifts in West Antarctic ice stream direction 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. 2014-12-01 application/pdf http://dro.dur.ac.uk/20225/ http://dro.dur.ac.uk/20225/1/20225.pdf https://doi.org/10.1017/S0954102014000613 unknown Cambridge University Press dro:20225 issn:0954-1020 issn: 1365-2079 doi:10.1017/S0954102014000613 http://dro.dur.ac.uk/20225/ https://doi.org/10.1017/S0954102014000613 http://dro.dur.ac.uk/20225/1/20225.pdf © 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 Antarctic science, 2014, Vol.26(06), pp.674-686 [Peer Reviewed Journal] Article PeerReviewed 2014 ftunivdurham https://doi.org/10.1017/S0954102014000613 2020-05-28T22:36:05Z 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 Durham University: Durham Research Online 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 |
Durham University: Durham Research Online |
op_collection_id |
ftunivdurham |
language |
unknown |
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, C.J. Turney, C.S.M. Golledge, N.R. Rood, D.H. Hippe, K. Wacker, L. Wieler, R. Rainsley, E.B. Jones, R.S. |
spellingShingle |
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 from combined ice sheet modelling and geologic signatures. |
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 from combined ice sheet modelling and geologic signatures. |
title_short |
Drivers of abrupt Holocene shifts in West Antarctic ice stream direction from combined ice sheet modelling and geologic signatures. |
title_full |
Drivers of abrupt Holocene shifts in West Antarctic ice stream direction from combined ice sheet modelling and geologic signatures. |
title_fullStr |
Drivers of abrupt Holocene shifts in West Antarctic ice stream direction from combined ice sheet modelling and geologic signatures. |
title_full_unstemmed |
Drivers of abrupt Holocene shifts in West Antarctic ice stream direction from combined ice sheet modelling and geologic signatures. |
title_sort |
drivers of abrupt holocene shifts in west antarctic ice stream direction from combined ice sheet modelling and geologic signatures. |
publisher |
Cambridge University Press |
publishDate |
2014 |
url |
http://dro.dur.ac.uk/20225/ http://dro.dur.ac.uk/20225/1/20225.pdf 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 |
Antarctic science, 2014, Vol.26(06), pp.674-686 [Peer Reviewed Journal] |
op_relation |
dro:20225 issn:0954-1020 issn: 1365-2079 doi:10.1017/S0954102014000613 http://dro.dur.ac.uk/20225/ https://doi.org/10.1017/S0954102014000613 http://dro.dur.ac.uk/20225/1/20225.pdf |
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 |
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1766272399195504640 |