Early Last Interglacial ocean warming drove substantial ice mass loss from Antarctica
Author
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Turney, Chris S. M.
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Fogwill, Christopher J.
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Golledge, Nicholas R.
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McKay, Nicholas P.
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van Sebille, Erik
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Jones, Richard T.
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Etheridge, David
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Rubino, Mauro
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Thornton, David P.
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Davies, Siwan M.
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Ramsey, Christopher Bronk
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Thomas, Zoe A.
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Bird, Michael I.
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Munksgaard, Niels C.
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Kohno, Mika
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Woodward, John
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Winter, Kate
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Weyrich, Laura S.
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Rootes, Camilla M.
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Millman, Helen
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Albert, Paul G.
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Rivera Ibáñez, Sergio
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van Ommen, Tas
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Curran, Mark
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Moy, Andrew
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Rahmstorf, Stefan
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Kawamura, Kenji
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Hillenbrand, Claus Dieter
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Weber, Michael E.
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Manning, Christina J.
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Young, Jennifer
Author
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Cooper, Alan
Admission date
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2020-05-06T19:26:11Z
Available date
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2020-05-06T19:26:11Z
Publication date
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2020
Cita de ítem
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PNAS | February 25, 2020 | vol. 117 | no. 8
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Identifier
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10.1073/pnas.1902469117
Identifier
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https://repositorio.uchile.cl/handle/2250/174454
Abstract
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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 (similar to 2 m), ocean thermal expansion, and melting mountain glaciers (similar to 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.
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Patrocinador
dc.description.sponsorship
Australian Research Council
Royal Society of New Zealand
Linkage Partner Antarctic Logistics and Expeditions
LP120200724
NERC Natural Environment Research Council
NE/I027576/1
Coleg Cymraeg Cenedlaethol
European Research Council (ERC)
Fulbright Commission
259253
Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT)
Japan Society for the Promotion of Science
Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT)
15KK0027
17H06320
Australian Government