Growth and retreat of the last British–Irish Ice Sheet, 31 000 to 15 000 years ago: the BRITICE‐CHRONO reconstruction
International audience The BRITICE-CHRONO consortium of researchers undertook a dating programme to constrain the timing of advance, maximum extent and retreat of the British–Irish Ice Sheet between 31 000 and 15 000 years before present. The dating campaign across Ireland and Britain and their cont...
Published in: | Boreas |
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Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Other Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2022
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Subjects: | |
Online Access: | https://hal.science/hal-03791912 https://hal.science/hal-03791912/document https://hal.science/hal-03791912/file/bor.12594.pdf https://doi.org/10.1111/bor.12594 |
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Institut national des sciences de l'Univers: HAL-INSU |
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English |
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[SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Clark, Chris Ely, Jeremy Hindmarsh, Richard Bradley, Sarah Ignéczi, Adam Fabel, Derek Ó Cofaigh, Colm Chiverrell, Richard Scourse, James Benetti, Sara Bradwell, Tom Evans, David Roberts, David Burke, Matt Callard, S. Louise Medialdea, Alicia Saher, Margot Small, David Smedley, Rachel Gasson, Edward Gregoire, Lauren Gandy, Niall Hughes, Anna Ballantyne, Colin Bateman, Mark Bigg, Grant Doole, Jenny Dove, Dayton Duller, Geoff Jenkins, Geraint Livingstone, Stephen Mccarron, Stephen Moreton, Steve Pollard, David Praeg, Daniel Sejrup, Hans Petter van Landeghem, Katrien Wilson, Peter Growth and retreat of the last British–Irish Ice Sheet, 31 000 to 15 000 years ago: the BRITICE‐CHRONO reconstruction |
topic_facet |
[SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience The BRITICE-CHRONO consortium of researchers undertook a dating programme to constrain the timing of advance, maximum extent and retreat of the British–Irish Ice Sheet between 31 000 and 15 000 years before present. The dating campaign across Ireland and Britain and their continental shelves, and across the North Sea included 1500 days of field investigation yielding 18 000 km of marine geophysical data, 377 cores of sea floor sediments, and geomorphological and stratigraphical information at 121 sites on land; generating 690 new geochronometric ages. These findings are reported in 28 publications including synthesis into eight transect reconstructions. Here we build ice sheet-wide reconstructions consistent with these findings and using retreat patterns and dates for the inter-transect areas. Two reconstructions are presented, a wholly empirical version and a version that combines modelling with the new empirical evidence. Palaeoglaciological maps of ice extent, thickness, velocity, and flow geometry at thousand-year timesteps are presented. The maximum ice volume of 1.8 m sea level equivalent occurred at 23 ka. A larger extent than previously defined is found and widespread advance of ice to the continental shelf break is confirmed during the last glacial. Asynchrony occurred in the timing of maximum extent and onset of retreat, ranging from 30 to 22 ka. The tipping point of deglaciation at 22 ka was triggered by ice stream retreat and saddle collapses. Analysis of retreat rates leads us to accept our hypothesis that the marine-influenced sectors collapsed rapidly. First order controls on ice-sheet demise were glacio-isostatic loading triggering retreat of marine sectors, aided by glaciological instabilities and then climate warming finished off the smaller, terrestrial ice sheet. Overprinted on this signal were second order controls arising from variations in trough topographies and with sector-scale ice geometric readjustments arising from dispositions in the geography of the ... |
author2 |
Géoazur (GEOAZUR 7329) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Sud ) European Project: 656821,H2020,H2020-MSCA-IF-2014,SEAGAS(2016) |
format |
Article in Journal/Newspaper |
author |
Clark, Chris Ely, Jeremy Hindmarsh, Richard Bradley, Sarah Ignéczi, Adam Fabel, Derek Ó Cofaigh, Colm Chiverrell, Richard Scourse, James Benetti, Sara Bradwell, Tom Evans, David Roberts, David Burke, Matt Callard, S. Louise Medialdea, Alicia Saher, Margot Small, David Smedley, Rachel Gasson, Edward Gregoire, Lauren Gandy, Niall Hughes, Anna Ballantyne, Colin Bateman, Mark Bigg, Grant Doole, Jenny Dove, Dayton Duller, Geoff Jenkins, Geraint Livingstone, Stephen Mccarron, Stephen Moreton, Steve Pollard, David Praeg, Daniel Sejrup, Hans Petter van Landeghem, Katrien Wilson, Peter |
author_facet |
Clark, Chris Ely, Jeremy Hindmarsh, Richard Bradley, Sarah Ignéczi, Adam Fabel, Derek Ó Cofaigh, Colm Chiverrell, Richard Scourse, James Benetti, Sara Bradwell, Tom Evans, David Roberts, David Burke, Matt Callard, S. Louise Medialdea, Alicia Saher, Margot Small, David Smedley, Rachel Gasson, Edward Gregoire, Lauren Gandy, Niall Hughes, Anna Ballantyne, Colin Bateman, Mark Bigg, Grant Doole, Jenny Dove, Dayton Duller, Geoff Jenkins, Geraint Livingstone, Stephen Mccarron, Stephen Moreton, Steve Pollard, David Praeg, Daniel Sejrup, Hans Petter van Landeghem, Katrien Wilson, Peter |
author_sort |
Clark, Chris |
title |
Growth and retreat of the last British–Irish Ice Sheet, 31 000 to 15 000 years ago: the BRITICE‐CHRONO reconstruction |
title_short |
Growth and retreat of the last British–Irish Ice Sheet, 31 000 to 15 000 years ago: the BRITICE‐CHRONO reconstruction |
title_full |
Growth and retreat of the last British–Irish Ice Sheet, 31 000 to 15 000 years ago: the BRITICE‐CHRONO reconstruction |
title_fullStr |
Growth and retreat of the last British–Irish Ice Sheet, 31 000 to 15 000 years ago: the BRITICE‐CHRONO reconstruction |
title_full_unstemmed |
Growth and retreat of the last British–Irish Ice Sheet, 31 000 to 15 000 years ago: the BRITICE‐CHRONO reconstruction |
title_sort |
growth and retreat of the last british–irish ice sheet, 31 000 to 15 000 years ago: the britice‐chrono reconstruction |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://hal.science/hal-03791912 https://hal.science/hal-03791912/document https://hal.science/hal-03791912/file/bor.12594.pdf https://doi.org/10.1111/bor.12594 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
ISSN: 0300-9483 Boreas https://hal.science/hal-03791912 Boreas, 2022, 51 (4), pp.699-758. ⟨10.1111/bor.12594⟩ https://onlinelibrary.wiley.com/doi/10.1111/bor.12594 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1111/bor.12594 info:eu-repo/grantAgreement//656821/EU/Multi-disciplinary Comparison of Fluid Venting from Gas Hydrate Systems on the Mediterranean and Brazilian Continental Margins over Glacial-Interglacial Timescales/SEAGAS hal-03791912 https://hal.science/hal-03791912 https://hal.science/hal-03791912/document https://hal.science/hal-03791912/file/bor.12594.pdf doi:10.1111/bor.12594 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1111/bor.12594 |
container_title |
Boreas |
container_volume |
51 |
container_issue |
4 |
container_start_page |
699 |
op_container_end_page |
758 |
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1779315542452076544 |
spelling |
ftinsu:oai:HAL:hal-03791912v1 2023-10-09T21:52:23+02:00 Growth and retreat of the last British–Irish Ice Sheet, 31 000 to 15 000 years ago: the BRITICE‐CHRONO reconstruction Clark, Chris Ely, Jeremy Hindmarsh, Richard Bradley, Sarah Ignéczi, Adam Fabel, Derek Ó Cofaigh, Colm Chiverrell, Richard Scourse, James Benetti, Sara Bradwell, Tom Evans, David Roberts, David Burke, Matt Callard, S. Louise Medialdea, Alicia Saher, Margot Small, David Smedley, Rachel Gasson, Edward Gregoire, Lauren Gandy, Niall Hughes, Anna Ballantyne, Colin Bateman, Mark Bigg, Grant Doole, Jenny Dove, Dayton Duller, Geoff Jenkins, Geraint Livingstone, Stephen Mccarron, Stephen Moreton, Steve Pollard, David Praeg, Daniel Sejrup, Hans Petter van Landeghem, Katrien Wilson, Peter Géoazur (GEOAZUR 7329) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Sud ) European Project: 656821,H2020,H2020-MSCA-IF-2014,SEAGAS(2016) 2022-09-07 https://hal.science/hal-03791912 https://hal.science/hal-03791912/document https://hal.science/hal-03791912/file/bor.12594.pdf https://doi.org/10.1111/bor.12594 en eng HAL CCSD Wiley info:eu-repo/semantics/altIdentifier/doi/10.1111/bor.12594 info:eu-repo/grantAgreement//656821/EU/Multi-disciplinary Comparison of Fluid Venting from Gas Hydrate Systems on the Mediterranean and Brazilian Continental Margins over Glacial-Interglacial Timescales/SEAGAS hal-03791912 https://hal.science/hal-03791912 https://hal.science/hal-03791912/document https://hal.science/hal-03791912/file/bor.12594.pdf doi:10.1111/bor.12594 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 0300-9483 Boreas https://hal.science/hal-03791912 Boreas, 2022, 51 (4), pp.699-758. ⟨10.1111/bor.12594⟩ https://onlinelibrary.wiley.com/doi/10.1111/bor.12594 [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2022 ftinsu https://doi.org/10.1111/bor.12594 2023-09-13T16:26:01Z International audience The BRITICE-CHRONO consortium of researchers undertook a dating programme to constrain the timing of advance, maximum extent and retreat of the British–Irish Ice Sheet between 31 000 and 15 000 years before present. The dating campaign across Ireland and Britain and their continental shelves, and across the North Sea included 1500 days of field investigation yielding 18 000 km of marine geophysical data, 377 cores of sea floor sediments, and geomorphological and stratigraphical information at 121 sites on land; generating 690 new geochronometric ages. These findings are reported in 28 publications including synthesis into eight transect reconstructions. Here we build ice sheet-wide reconstructions consistent with these findings and using retreat patterns and dates for the inter-transect areas. Two reconstructions are presented, a wholly empirical version and a version that combines modelling with the new empirical evidence. Palaeoglaciological maps of ice extent, thickness, velocity, and flow geometry at thousand-year timesteps are presented. The maximum ice volume of 1.8 m sea level equivalent occurred at 23 ka. A larger extent than previously defined is found and widespread advance of ice to the continental shelf break is confirmed during the last glacial. Asynchrony occurred in the timing of maximum extent and onset of retreat, ranging from 30 to 22 ka. The tipping point of deglaciation at 22 ka was triggered by ice stream retreat and saddle collapses. Analysis of retreat rates leads us to accept our hypothesis that the marine-influenced sectors collapsed rapidly. First order controls on ice-sheet demise were glacio-isostatic loading triggering retreat of marine sectors, aided by glaciological instabilities and then climate warming finished off the smaller, terrestrial ice sheet. Overprinted on this signal were second order controls arising from variations in trough topographies and with sector-scale ice geometric readjustments arising from dispositions in the geography of the ... Article in Journal/Newspaper Ice Sheet Institut national des sciences de l'Univers: HAL-INSU Boreas 51 4 699 758 |