Antarctic ice sheet discharge driven by atmosphere-ocean feedbacks at the Last Glacial Termination
Reconstructing the dynamic response of the Antarctic ice sheets to warming during the Last Glacial Termination (LGT; 18,00011,650 yrs ago) allows us to disentangle ice-climate feedbacks that are key to improving future projections. Whilst the sequence of events during this period is reasonably well-...
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Online Access: | https://doi.org/10.1038/srep39979 http://ecite.utas.edu.au/113655 |
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ftunivtasecite:oai:ecite.utas.edu.au:113655 2023-05-15T13:49:03+02:00 Antarctic ice sheet discharge driven by atmosphere-ocean feedbacks at the Last Glacial Termination Fogwill, CJ Turney, CSM Golledge, NR Etheridge, DM Rubino, M Thornton, DP Baker, A Woodward, J Winter, K van Ommen, TD Moy, AD Curran, MAJ Davies, SM Weber, ME Bird, MI Munksgaard, NC Menviel, L Rootes, CM Ellis, B Millman, H Vohra, J Rivera, A Cooper, A 2017 application/pdf https://doi.org/10.1038/srep39979 http://ecite.utas.edu.au/113655 en eng Nature Publishing Group http://ecite.utas.edu.au/113655/1/Fogwill et al 2017_Antarctic ice sheet discharge at LGT_NatureScReports39979.pdf http://dx.doi.org/10.1038/srep39979 Fogwill, CJ and Turney, CSM and Golledge, NR and Etheridge, DM and Rubino, M and Thornton, DP and Baker, A and Woodward, J and Winter, K and van Ommen, TD and Moy, AD and Curran, MAJ and Davies, SM and Weber, ME and Bird, MI and Munksgaard, NC and Menviel, L and Rootes, CM and Ellis, B and Millman, H and Vohra, J and Rivera, A and Cooper, A, Antarctic ice sheet discharge driven by atmosphere-ocean feedbacks at the Last Glacial Termination, Scientific Reports, 7 Article 39979. ISSN 2045-2322 (2017) [Refereed Article] http://ecite.utas.edu.au/113655 Earth Sciences Physical Geography and Environmental Geoscience Glaciology Refereed Article PeerReviewed 2017 ftunivtasecite https://doi.org/10.1038/srep39979 2019-12-13T22:13:39Z Reconstructing the dynamic response of the Antarctic ice sheets to warming during the Last Glacial Termination (LGT; 18,00011,650 yrs ago) allows us to disentangle ice-climate feedbacks that are key to improving future projections. Whilst the sequence of events during this period is reasonably well-known, relatively poor chronological control has precluded precise alignment of ice, atmospheric and marine records, making it difficult to assess relationships between Antarctic ice-sheet (AIS) dynamics, climate change and sea level. Here we present results from a highly-resolved horizontal ice core from the Weddell Sea Embayment, which records millennial-scale AIS dynamics across this extensive region. Counterintuitively, we find AIS mass-loss across the full duration of the Antarctic Cold Reversal (ACR; 14,60012,700 yrs ago), with stabilisation during the subsequent millennia of atmospheric warming. Earth-system and ice-sheet modelling suggests these contrasting trends were likely Antarctic-wide, sustained by feedbacks amplified by the delivery of Circumpolar Deep Water onto the continental shelf. Given the anti-phase relationship between inter-hemispheric climate trends across the LGT our findings demonstrate that Southern Ocean-AIS feedbacks were controlled by global atmospheric teleconnections. With increasing stratification of the Southern Ocean and intensification of mid-latitude westerly winds today, such teleconnections could amplify AIS mass loss and accelerate global sea-level rise. Article in Journal/Newspaper Antarc* Antarctic ice core Ice Sheet Southern Ocean Weddell Sea eCite UTAS (University of Tasmania) Antarctic Southern Ocean The Antarctic Weddell Weddell Sea Scientific Reports 7 1 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology |
spellingShingle |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology Fogwill, CJ Turney, CSM Golledge, NR Etheridge, DM Rubino, M Thornton, DP Baker, A Woodward, J Winter, K van Ommen, TD Moy, AD Curran, MAJ Davies, SM Weber, ME Bird, MI Munksgaard, NC Menviel, L Rootes, CM Ellis, B Millman, H Vohra, J Rivera, A Cooper, A Antarctic ice sheet discharge driven by atmosphere-ocean feedbacks at the Last Glacial Termination |
topic_facet |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology |
description |
Reconstructing the dynamic response of the Antarctic ice sheets to warming during the Last Glacial Termination (LGT; 18,00011,650 yrs ago) allows us to disentangle ice-climate feedbacks that are key to improving future projections. Whilst the sequence of events during this period is reasonably well-known, relatively poor chronological control has precluded precise alignment of ice, atmospheric and marine records, making it difficult to assess relationships between Antarctic ice-sheet (AIS) dynamics, climate change and sea level. Here we present results from a highly-resolved horizontal ice core from the Weddell Sea Embayment, which records millennial-scale AIS dynamics across this extensive region. Counterintuitively, we find AIS mass-loss across the full duration of the Antarctic Cold Reversal (ACR; 14,60012,700 yrs ago), with stabilisation during the subsequent millennia of atmospheric warming. Earth-system and ice-sheet modelling suggests these contrasting trends were likely Antarctic-wide, sustained by feedbacks amplified by the delivery of Circumpolar Deep Water onto the continental shelf. Given the anti-phase relationship between inter-hemispheric climate trends across the LGT our findings demonstrate that Southern Ocean-AIS feedbacks were controlled by global atmospheric teleconnections. With increasing stratification of the Southern Ocean and intensification of mid-latitude westerly winds today, such teleconnections could amplify AIS mass loss and accelerate global sea-level rise. |
format |
Article in Journal/Newspaper |
author |
Fogwill, CJ Turney, CSM Golledge, NR Etheridge, DM Rubino, M Thornton, DP Baker, A Woodward, J Winter, K van Ommen, TD Moy, AD Curran, MAJ Davies, SM Weber, ME Bird, MI Munksgaard, NC Menviel, L Rootes, CM Ellis, B Millman, H Vohra, J Rivera, A Cooper, A |
author_facet |
Fogwill, CJ Turney, CSM Golledge, NR Etheridge, DM Rubino, M Thornton, DP Baker, A Woodward, J Winter, K van Ommen, TD Moy, AD Curran, MAJ Davies, SM Weber, ME Bird, MI Munksgaard, NC Menviel, L Rootes, CM Ellis, B Millman, H Vohra, J Rivera, A Cooper, A |
author_sort |
Fogwill, CJ |
title |
Antarctic ice sheet discharge driven by atmosphere-ocean feedbacks at the Last Glacial Termination |
title_short |
Antarctic ice sheet discharge driven by atmosphere-ocean feedbacks at the Last Glacial Termination |
title_full |
Antarctic ice sheet discharge driven by atmosphere-ocean feedbacks at the Last Glacial Termination |
title_fullStr |
Antarctic ice sheet discharge driven by atmosphere-ocean feedbacks at the Last Glacial Termination |
title_full_unstemmed |
Antarctic ice sheet discharge driven by atmosphere-ocean feedbacks at the Last Glacial Termination |
title_sort |
antarctic ice sheet discharge driven by atmosphere-ocean feedbacks at the last glacial termination |
publisher |
Nature Publishing Group |
publishDate |
2017 |
url |
https://doi.org/10.1038/srep39979 http://ecite.utas.edu.au/113655 |
geographic |
Antarctic Southern Ocean The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic Southern Ocean The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic ice core Ice Sheet Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic ice core Ice Sheet Southern Ocean Weddell Sea |
op_relation |
http://ecite.utas.edu.au/113655/1/Fogwill et al 2017_Antarctic ice sheet discharge at LGT_NatureScReports39979.pdf http://dx.doi.org/10.1038/srep39979 Fogwill, CJ and Turney, CSM and Golledge, NR and Etheridge, DM and Rubino, M and Thornton, DP and Baker, A and Woodward, J and Winter, K and van Ommen, TD and Moy, AD and Curran, MAJ and Davies, SM and Weber, ME and Bird, MI and Munksgaard, NC and Menviel, L and Rootes, CM and Ellis, B and Millman, H and Vohra, J and Rivera, A and Cooper, A, Antarctic ice sheet discharge driven by atmosphere-ocean feedbacks at the Last Glacial Termination, Scientific Reports, 7 Article 39979. ISSN 2045-2322 (2017) [Refereed Article] http://ecite.utas.edu.au/113655 |
op_doi |
https://doi.org/10.1038/srep39979 |
container_title |
Scientific Reports |
container_volume |
7 |
container_issue |
1 |
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1766250682967392256 |