Early Last Interglacial ocean warming drove substantial ice mass loss from Antarctica
The future response of the Antarctic ice sheet to rising temperatures remains highly uncertain. A useful period for assessing the sensitivity of Antarctica to warming is the Last Interglacial (LIG; 129-116 kyr), which experienced warmer polar temperatures and higher global mean sea level (GMSL +6 to...
Main Authors: | , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
National Academy of Sciences
2020
|
Subjects: | |
Online Access: | https://eprints.keele.ac.uk/id/eprint/7452/ https://eprints.keele.ac.uk/id/eprint/7452/1/Turney_LIG%20submitted.pdf https://doi.org/10.5194/egusphere-egu2020-12771 |
id |
ftkeeleuniv:oai:eprints.keele.ac.uk:7452 |
---|---|
record_format |
openpolar |
spelling |
ftkeeleuniv:oai:eprints.keele.ac.uk:7452 2023-07-30T03:58:09+02:00 Early Last Interglacial ocean warming drove substantial ice mass loss from Antarctica Turney, C Fogwill, CJ 2020-02-25 text https://eprints.keele.ac.uk/id/eprint/7452/ https://eprints.keele.ac.uk/id/eprint/7452/1/Turney_LIG%20submitted.pdf https://doi.org/10.5194/egusphere-egu2020-12771 en eng National Academy of Sciences https://eprints.keele.ac.uk/id/eprint/7452/1/Turney_LIG%20submitted.pdf Turney, C and Fogwill, CJ orcid:0000-0002-6471-1106 (2020) Early Last Interglacial ocean warming drove substantial ice mass loss from Antarctica. Proceedings Of The National Academy Of Sciences Of The United States Of America, 117 (8). pp. 3996-4006. doi:10.5194/egusphere-egu2020-12771 cc_by_nc_4 G Geography (General) Article PeerReviewed 2020 ftkeeleuniv https://doi.org/10.5194/egusphere-egu2020-12771 2023-07-10T21:18:00Z The future response of the Antarctic ice sheet to rising temperatures remains highly uncertain. A useful period for assessing the sensitivity of Antarctica to warming is the Last Interglacial (LIG; 129-116 kyr), which experienced warmer polar temperatures and higher global mean sea level (GMSL +6 to 9 m) relative to present day. LIG sea level cannot be fully explained by Greenland Ice Sheet melt (~2 m), ocean thermal expansion and melting mountain glaciers (~1 m), suggesting substantial Antarctic mass loss was initiated by warming of Southern Ocean waters, resulting from a weakening Atlantic Meridional Overturning Circulation in response to North Atlantic surface freshening. Here we report a blue-ice record of ice-sheet and environmental change from the Weddell Sea Embayment at the periphery of the marine-based West Antarctic Ice Sheet (WAIS) which is underlain by major methane hydrate reserves. Constrained by a widespread volcanic horizon and supported by ancient microbial DNA analyses, we provide the first evidence for substantial mass loss across the Weddell Sea Embayment during the Last Interglacial, most likely driven by ocean warming and associated with destabilization of sub-glacial hydrates. Ice-sheet modelling supports this interpretation and suggests that millennial-scale warming of the Southern Ocean could have triggered a multi-meter rise in global sea levels. Our data indicate that Antarctica is highly vulnerable to projected increases in ocean temperatures and may drive ice-climate feedbacks that further amplify warming. Article in Journal/Newspaper Antarc* Antarctic Antarctica Greenland Ice Sheet Methane hydrate North Atlantic Southern Ocean Weddell Sea Keele University: Keele Research Repository Antarctic Greenland Southern Ocean The Antarctic Weddell Weddell Sea West Antarctic Ice Sheet |
institution |
Open Polar |
collection |
Keele University: Keele Research Repository |
op_collection_id |
ftkeeleuniv |
language |
English |
topic |
G Geography (General) |
spellingShingle |
G Geography (General) Turney, C Fogwill, CJ Early Last Interglacial ocean warming drove substantial ice mass loss from Antarctica |
topic_facet |
G Geography (General) |
description |
The future response of the Antarctic ice sheet to rising temperatures remains highly uncertain. A useful period for assessing the sensitivity of Antarctica to warming is the Last Interglacial (LIG; 129-116 kyr), which experienced warmer polar temperatures and higher global mean sea level (GMSL +6 to 9 m) relative to present day. LIG sea level cannot be fully explained by Greenland Ice Sheet melt (~2 m), ocean thermal expansion and melting mountain glaciers (~1 m), suggesting substantial Antarctic mass loss was initiated by warming of Southern Ocean waters, resulting from a weakening Atlantic Meridional Overturning Circulation in response to North Atlantic surface freshening. Here we report a blue-ice record of ice-sheet and environmental change from the Weddell Sea Embayment at the periphery of the marine-based West Antarctic Ice Sheet (WAIS) which is underlain by major methane hydrate reserves. Constrained by a widespread volcanic horizon and supported by ancient microbial DNA analyses, we provide the first evidence for substantial mass loss across the Weddell Sea Embayment during the Last Interglacial, most likely driven by ocean warming and associated with destabilization of sub-glacial hydrates. Ice-sheet modelling supports this interpretation and suggests that millennial-scale warming of the Southern Ocean could have triggered a multi-meter rise in global sea levels. Our data indicate that Antarctica is highly vulnerable to projected increases in ocean temperatures and may drive ice-climate feedbacks that further amplify warming. |
format |
Article in Journal/Newspaper |
author |
Turney, C Fogwill, CJ |
author_facet |
Turney, C Fogwill, CJ |
author_sort |
Turney, C |
title |
Early Last Interglacial ocean warming drove substantial ice mass loss from Antarctica |
title_short |
Early Last Interglacial ocean warming drove substantial ice mass loss from Antarctica |
title_full |
Early Last Interglacial ocean warming drove substantial ice mass loss from Antarctica |
title_fullStr |
Early Last Interglacial ocean warming drove substantial ice mass loss from Antarctica |
title_full_unstemmed |
Early Last Interglacial ocean warming drove substantial ice mass loss from Antarctica |
title_sort |
early last interglacial ocean warming drove substantial ice mass loss from antarctica |
publisher |
National Academy of Sciences |
publishDate |
2020 |
url |
https://eprints.keele.ac.uk/id/eprint/7452/ https://eprints.keele.ac.uk/id/eprint/7452/1/Turney_LIG%20submitted.pdf https://doi.org/10.5194/egusphere-egu2020-12771 |
geographic |
Antarctic Greenland Southern Ocean The Antarctic Weddell Weddell Sea West Antarctic Ice Sheet |
geographic_facet |
Antarctic Greenland Southern Ocean The Antarctic Weddell Weddell Sea West Antarctic Ice Sheet |
genre |
Antarc* Antarctic Antarctica Greenland Ice Sheet Methane hydrate North Atlantic Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctica Greenland Ice Sheet Methane hydrate North Atlantic Southern Ocean Weddell Sea |
op_relation |
https://eprints.keele.ac.uk/id/eprint/7452/1/Turney_LIG%20submitted.pdf Turney, C and Fogwill, CJ orcid:0000-0002-6471-1106 (2020) Early Last Interglacial ocean warming drove substantial ice mass loss from Antarctica. Proceedings Of The National Academy Of Sciences Of The United States Of America, 117 (8). pp. 3996-4006. doi:10.5194/egusphere-egu2020-12771 |
op_rights |
cc_by_nc_4 |
op_doi |
https://doi.org/10.5194/egusphere-egu2020-12771 |
_version_ |
1772821042054561792 |