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 to 116 ky), which experienced warmer polar temperatures and higher global mean sea level (GMSL) (...
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Natl Acad Sciences
2020
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ftunivtasmania:oai:eprints.utas.edu.au:33904 2023-05-15T13:31:54+02:00 Early Last Interglacial ocean warming drove substantial ice mass loss from Antarctica Turney, CSM Fogwill, CJ Golledge, NR McKay, NP van Sebille, E Jones, RT Etheridge, D Rubino, M Thornton, DP Davies, SM Ramsey, CB Thomas, ZA Bird, MI Munksgard, NC Kohno, M Woodward, J Winter, K Weyrich, LS Rootes, CM Millman, H Albert, PG Rivera, A van Ommen, T Curran, M Moy, A Rahmstorf, S Kawamura, K Hillenbrand, C-D Weber, ME Manning, CJ Young, J Cooper, A 2020 application/pdf https://eprints.utas.edu.au/33904/ https://eprints.utas.edu.au/33904/1/137451%20-%20Early%20Last%20Interglacial%20ocean%20warming%20drove%20substantial%20ice%20mass%20loss%20from%20Antarctica.pdf en eng Natl Acad Sciences https://eprints.utas.edu.au/33904/1/137451%20-%20Early%20Last%20Interglacial%20ocean%20warming%20drove%20substantial%20ice%20mass%20loss%20from%20Antarctica.pdf Turney, CSM, Fogwill, CJ, Golledge, NR, McKay, NP, van Sebille, E, Jones, RT, Etheridge, D, Rubino, M, Thornton, DP, Davies, SM, Ramsey, CB, Thomas, ZA, Bird, MI, Munksgard, NC, Kohno, M, Woodward, J, Winter, K, Weyrich, LS, Rootes, CM, Millman, H, Albert, PG, Rivera, A, van Ommen, T orcid:0000-0002-2463-1718 , Curran, M, Moy, A, Rahmstorf, S, Kawamura, K, Hillenbrand, C-D, Weber, ME, Manning, CJ, Young, J and Cooper, A 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, vol. 117, no. 8 , pp. 3996-4006 , doi:10.1073/pnas.1902469117 <http://dx.doi.org/10.1073/pnas.1902469117>. Antarctic ice sheets marine ice sheet instability (MISI) paleoclimatology polar amplification tipping element Article PeerReviewed 2020 ftunivtasmania https://doi.org/10.1073/pnas.1902469117 2021-09-20T22:18:49Z 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 to 116 ky), 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 evidence for substantial mass loss across the Weddell Sea Embayment during the LIG, most likely driven by ocean warming and associated with destabilization of subglacial hydrates. Ice sheet modeling supports this interpretation and suggests that millennial-scale warming of the Southern Ocean could have triggered a multimeter 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 University of Tasmania: UTas ePrints Antarctic Southern Ocean The Antarctic Weddell Sea West Antarctic Ice Sheet Greenland Weddell Misi ENVELOPE(26.683,26.683,66.617,66.617) Proceedings of the National Academy of Sciences 117 8 3996 4006 |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
English |
topic |
Antarctic ice sheets marine ice sheet instability (MISI) paleoclimatology polar amplification tipping element |
spellingShingle |
Antarctic ice sheets marine ice sheet instability (MISI) paleoclimatology polar amplification tipping element Turney, CSM Fogwill, CJ Golledge, NR McKay, NP van Sebille, E Jones, RT Etheridge, D Rubino, M Thornton, DP Davies, SM Ramsey, CB Thomas, ZA Bird, MI Munksgard, NC Kohno, M Woodward, J Winter, K Weyrich, LS Rootes, CM Millman, H Albert, PG Rivera, A van Ommen, T Curran, M Moy, A Rahmstorf, S Kawamura, K Hillenbrand, C-D Weber, ME Manning, CJ Young, J Cooper, A Early Last Interglacial ocean warming drove substantial ice mass loss from Antarctica |
topic_facet |
Antarctic ice sheets marine ice sheet instability (MISI) paleoclimatology polar amplification tipping element |
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 to 116 ky), 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 evidence for substantial mass loss across the Weddell Sea Embayment during the LIG, most likely driven by ocean warming and associated with destabilization of subglacial hydrates. Ice sheet modeling supports this interpretation and suggests that millennial-scale warming of the Southern Ocean could have triggered a multimeter 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, CSM Fogwill, CJ Golledge, NR McKay, NP van Sebille, E Jones, RT Etheridge, D Rubino, M Thornton, DP Davies, SM Ramsey, CB Thomas, ZA Bird, MI Munksgard, NC Kohno, M Woodward, J Winter, K Weyrich, LS Rootes, CM Millman, H Albert, PG Rivera, A van Ommen, T Curran, M Moy, A Rahmstorf, S Kawamura, K Hillenbrand, C-D Weber, ME Manning, CJ Young, J Cooper, A |
author_facet |
Turney, CSM Fogwill, CJ Golledge, NR McKay, NP van Sebille, E Jones, RT Etheridge, D Rubino, M Thornton, DP Davies, SM Ramsey, CB Thomas, ZA Bird, MI Munksgard, NC Kohno, M Woodward, J Winter, K Weyrich, LS Rootes, CM Millman, H Albert, PG Rivera, A van Ommen, T Curran, M Moy, A Rahmstorf, S Kawamura, K Hillenbrand, C-D Weber, ME Manning, CJ Young, J Cooper, A |
author_sort |
Turney, CSM |
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 |
Natl Acad Sciences |
publishDate |
2020 |
url |
https://eprints.utas.edu.au/33904/ https://eprints.utas.edu.au/33904/1/137451%20-%20Early%20Last%20Interglacial%20ocean%20warming%20drove%20substantial%20ice%20mass%20loss%20from%20Antarctica.pdf |
long_lat |
ENVELOPE(26.683,26.683,66.617,66.617) |
geographic |
Antarctic Southern Ocean The Antarctic Weddell Sea West Antarctic Ice Sheet Greenland Weddell Misi |
geographic_facet |
Antarctic Southern Ocean The Antarctic Weddell Sea West Antarctic Ice Sheet Greenland Weddell Misi |
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.utas.edu.au/33904/1/137451%20-%20Early%20Last%20Interglacial%20ocean%20warming%20drove%20substantial%20ice%20mass%20loss%20from%20Antarctica.pdf Turney, CSM, Fogwill, CJ, Golledge, NR, McKay, NP, van Sebille, E, Jones, RT, Etheridge, D, Rubino, M, Thornton, DP, Davies, SM, Ramsey, CB, Thomas, ZA, Bird, MI, Munksgard, NC, Kohno, M, Woodward, J, Winter, K, Weyrich, LS, Rootes, CM, Millman, H, Albert, PG, Rivera, A, van Ommen, T orcid:0000-0002-2463-1718 , Curran, M, Moy, A, Rahmstorf, S, Kawamura, K, Hillenbrand, C-D, Weber, ME, Manning, CJ, Young, J and Cooper, A 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, vol. 117, no. 8 , pp. 3996-4006 , doi:10.1073/pnas.1902469117 <http://dx.doi.org/10.1073/pnas.1902469117>. |
op_doi |
https://doi.org/10.1073/pnas.1902469117 |
container_title |
Proceedings of the National Academy of Sciences |
container_volume |
117 |
container_issue |
8 |
container_start_page |
3996 |
op_container_end_page |
4006 |
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1766022158097580032 |