Pattern, style and timing of British-Irish Ice Sheet advance and retreat over the last 45 000 years: evidence from NW Scotland and the adjacent continental shelf
Predicting the future response of ice sheets to climate warming and rising global sea level is important but difficult. This is especially so when fast‐flowing glaciers or ice streams, buffered by ice shelves, are grounded on beds below sea level. What happens when these ice shelves are removed? And...
Published in: | Journal of Quaternary Science |
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Main Authors: | , , , , , , , , , , , , , , |
Other Authors: | , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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Wiley
2021
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Subjects: | |
Online Access: | http://hdl.handle.net/1893/32499 https://doi.org/10.1002/jqs.3296 http://dspace.stir.ac.uk/bitstream/1893/32499/1/jqs.3296.pdf |
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ftunivstirling:oai:dspace.stir.ac.uk:1893/32499 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
University of Stirling: Stirling Digital Research Repository |
op_collection_id |
ftunivstirling |
language |
English |
topic |
Bayesian modelling ice stream marine ice‐sheet instability palaeoglaciology Weichselian |
spellingShingle |
Bayesian modelling ice stream marine ice‐sheet instability palaeoglaciology Weichselian Bradwell, Tom Fabel, Derek Clark, Chris D Chiverrell, Richard C Small, David Smedley, Rachel K Saher, Margot H Moreton, Steven J Dove, Dayton Callard, S Louise Duller, Geoff A T Medialdea, Alicia Bateman, Mark D Burke, Matthew J McDonald, Neil Pattern, style and timing of British-Irish Ice Sheet advance and retreat over the last 45 000 years: evidence from NW Scotland and the adjacent continental shelf |
topic_facet |
Bayesian modelling ice stream marine ice‐sheet instability palaeoglaciology Weichselian |
description |
Predicting the future response of ice sheets to climate warming and rising global sea level is important but difficult. This is especially so when fast‐flowing glaciers or ice streams, buffered by ice shelves, are grounded on beds below sea level. What happens when these ice shelves are removed? And how do the ice stream and the surrounding ice sheet respond to the abruptly altered boundary conditions? To address these questions and others we present new geological, geomorphological, geophysical and geochronological data from the ice‐stream‐dominated NW sector of the last British–Irish Ice Sheet (BIIS). The study area covers around 45 000 km2 of NW Scotland and the surrounding continental shelf. Alongside seabed geomorphological mapping and Quaternary sediment analysis, we use a suite of over 100 new absolute ages (including cosmogenic‐nuclide exposure ages, optically stimulated luminescence ages and radiocarbon dates) collected from onshore and offshore, to build a sector‐wide ice‐sheet reconstruction combining all available evidence with Bayesian chronosequence modelling. Using this information we present a detailed assessment of ice‐sheet advance/retreat history, and the glaciological connections between different areas of the NW BIIS sector, at different times during the last glacial cycle. The results show a highly dynamic, partly marine, partly terrestrial, ice‐sheet sector undergoing large size variations in response to sub‐millennial‐scale climatic (Dansgaard–Oeschger) cycles over the last 45 000 years. Superimposed on these trends we identify internally driven instabilities, operating at higher frequency, conditioned by local topographic factors, tidewater dynamics and glaciological feedbacks during deglaciation. Specifically, our new evidence indicates extensive marine‐terminating ice‐sheet glaciation of the NW BIIS sector during Greenland Stadials 12 to 9 – prior to the main ‘Late Weichselian’ ice‐sheet glaciation. After a period of restricted glaciation, in Greenland Interstadials 8 to 6, we find ... |
author2 |
NERC Natural Environment Research Council Biological and Environmental Sciences University of Glasgow University of Sheffield University of Liverpool Durham University Bangor University NERC Radiocarbon Laboratory British Geological Survey Newcastle University Aberystwyth University orcid:0000-0003-0947-3309 |
format |
Article in Journal/Newspaper |
author |
Bradwell, Tom Fabel, Derek Clark, Chris D Chiverrell, Richard C Small, David Smedley, Rachel K Saher, Margot H Moreton, Steven J Dove, Dayton Callard, S Louise Duller, Geoff A T Medialdea, Alicia Bateman, Mark D Burke, Matthew J McDonald, Neil |
author_facet |
Bradwell, Tom Fabel, Derek Clark, Chris D Chiverrell, Richard C Small, David Smedley, Rachel K Saher, Margot H Moreton, Steven J Dove, Dayton Callard, S Louise Duller, Geoff A T Medialdea, Alicia Bateman, Mark D Burke, Matthew J McDonald, Neil |
author_sort |
Bradwell, Tom |
title |
Pattern, style and timing of British-Irish Ice Sheet advance and retreat over the last 45 000 years: evidence from NW Scotland and the adjacent continental shelf |
title_short |
Pattern, style and timing of British-Irish Ice Sheet advance and retreat over the last 45 000 years: evidence from NW Scotland and the adjacent continental shelf |
title_full |
Pattern, style and timing of British-Irish Ice Sheet advance and retreat over the last 45 000 years: evidence from NW Scotland and the adjacent continental shelf |
title_fullStr |
Pattern, style and timing of British-Irish Ice Sheet advance and retreat over the last 45 000 years: evidence from NW Scotland and the adjacent continental shelf |
title_full_unstemmed |
Pattern, style and timing of British-Irish Ice Sheet advance and retreat over the last 45 000 years: evidence from NW Scotland and the adjacent continental shelf |
title_sort |
pattern, style and timing of british-irish ice sheet advance and retreat over the last 45 000 years: evidence from nw scotland and the adjacent continental shelf |
publisher |
Wiley |
publishDate |
2021 |
url |
http://hdl.handle.net/1893/32499 https://doi.org/10.1002/jqs.3296 http://dspace.stir.ac.uk/bitstream/1893/32499/1/jqs.3296.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet Ice Shelves |
genre_facet |
Greenland Ice Sheet Ice Shelves |
op_relation |
Bradwell T, Fabel D, Clark CD, Chiverrell RC, Small D, Smedley RK, Saher MH, Moreton SJ, Dove D, Callard SL, Duller GAT, Medialdea A, Bateman MD, Burke MJ & McDonald N (2021) Pattern, style and timing of British-Irish Ice Sheet advance and retreat over the last 45 000 years: evidence from NW Scotland and the adjacent continental shelf. Journal of Quaternary Science , 36 (5), pp. 871-933. https://doi.org/10.1002/jqs.3296 BRITICE-CHRONO NE/J007846/2 http://hdl.handle.net/1893/32499 doi:10.1002/jqs.3296 WOS:000637080500001 2-s2.0-85103588941 1719251 http://dspace.stir.ac.uk/bitstream/1893/32499/1/jqs.3296.pdf |
op_rights |
© 2021 The Authors. Journal of Quaternary Science Published by John Wiley & Sons Ltd This is an open access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited. http://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1002/jqs.3296 |
container_title |
Journal of Quaternary Science |
container_volume |
36 |
container_issue |
5 |
container_start_page |
871 |
op_container_end_page |
933 |
_version_ |
1766018373887459328 |
spelling |
ftunivstirling:oai:dspace.stir.ac.uk:1893/32499 2023-05-15T16:28:42+02:00 Pattern, style and timing of British-Irish Ice Sheet advance and retreat over the last 45 000 years: evidence from NW Scotland and the adjacent continental shelf Bradwell, Tom Fabel, Derek Clark, Chris D Chiverrell, Richard C Small, David Smedley, Rachel K Saher, Margot H Moreton, Steven J Dove, Dayton Callard, S Louise Duller, Geoff A T Medialdea, Alicia Bateman, Mark D Burke, Matthew J McDonald, Neil NERC Natural Environment Research Council Biological and Environmental Sciences University of Glasgow University of Sheffield University of Liverpool Durham University Bangor University NERC Radiocarbon Laboratory British Geological Survey Newcastle University Aberystwyth University orcid:0000-0003-0947-3309 2021-07 application/pdf http://hdl.handle.net/1893/32499 https://doi.org/10.1002/jqs.3296 http://dspace.stir.ac.uk/bitstream/1893/32499/1/jqs.3296.pdf en eng Wiley Bradwell T, Fabel D, Clark CD, Chiverrell RC, Small D, Smedley RK, Saher MH, Moreton SJ, Dove D, Callard SL, Duller GAT, Medialdea A, Bateman MD, Burke MJ & McDonald N (2021) Pattern, style and timing of British-Irish Ice Sheet advance and retreat over the last 45 000 years: evidence from NW Scotland and the adjacent continental shelf. Journal of Quaternary Science , 36 (5), pp. 871-933. https://doi.org/10.1002/jqs.3296 BRITICE-CHRONO NE/J007846/2 http://hdl.handle.net/1893/32499 doi:10.1002/jqs.3296 WOS:000637080500001 2-s2.0-85103588941 1719251 http://dspace.stir.ac.uk/bitstream/1893/32499/1/jqs.3296.pdf © 2021 The Authors. Journal of Quaternary Science Published by John Wiley & Sons Ltd This is an open access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited. http://creativecommons.org/licenses/by/4.0/ CC-BY Bayesian modelling ice stream marine ice‐sheet instability palaeoglaciology Weichselian Journal Article VoR - Version of Record 2021 ftunivstirling https://doi.org/10.1002/jqs.3296 2023-02-02T23:17:15Z Predicting the future response of ice sheets to climate warming and rising global sea level is important but difficult. This is especially so when fast‐flowing glaciers or ice streams, buffered by ice shelves, are grounded on beds below sea level. What happens when these ice shelves are removed? And how do the ice stream and the surrounding ice sheet respond to the abruptly altered boundary conditions? To address these questions and others we present new geological, geomorphological, geophysical and geochronological data from the ice‐stream‐dominated NW sector of the last British–Irish Ice Sheet (BIIS). The study area covers around 45 000 km2 of NW Scotland and the surrounding continental shelf. Alongside seabed geomorphological mapping and Quaternary sediment analysis, we use a suite of over 100 new absolute ages (including cosmogenic‐nuclide exposure ages, optically stimulated luminescence ages and radiocarbon dates) collected from onshore and offshore, to build a sector‐wide ice‐sheet reconstruction combining all available evidence with Bayesian chronosequence modelling. Using this information we present a detailed assessment of ice‐sheet advance/retreat history, and the glaciological connections between different areas of the NW BIIS sector, at different times during the last glacial cycle. The results show a highly dynamic, partly marine, partly terrestrial, ice‐sheet sector undergoing large size variations in response to sub‐millennial‐scale climatic (Dansgaard–Oeschger) cycles over the last 45 000 years. Superimposed on these trends we identify internally driven instabilities, operating at higher frequency, conditioned by local topographic factors, tidewater dynamics and glaciological feedbacks during deglaciation. Specifically, our new evidence indicates extensive marine‐terminating ice‐sheet glaciation of the NW BIIS sector during Greenland Stadials 12 to 9 – prior to the main ‘Late Weichselian’ ice‐sheet glaciation. After a period of restricted glaciation, in Greenland Interstadials 8 to 6, we find ... Article in Journal/Newspaper Greenland Ice Sheet Ice Shelves University of Stirling: Stirling Digital Research Repository Greenland Journal of Quaternary Science 36 5 871 933 |