气候变化领域集成服务门户(CCPortal): Early Last Interglacial ocean warming drove substantial ice mass loss from Antarctica

CCPortal

DOI	10.1073/pnas.1902469117
	Early Last Interglacial ocean warming drove substantial ice mass loss from Antarctica
	Turney C.S.M.; Fogwill C.J.; Golledge N.R.; McKay N.P.; van Sebille E.; Jones R.T.; Etheridge D.; Rubino M.; Thornton D.P.; Davies S.M.; Ramsey C.B.; Thomas Z.A.; Bird M.I.; Munksgaard N.C.; Kohno M.; Woodward J.; Winter K.; Weyrich L.S.; Rootes C.M.; Millman H.; Albert P.G.; Rivera A.; van Ommen T.; Curran M.; Moy A.; Rahmstorf S.; Kawamura K.; Hillenbrand C.-D.; Weber M.E.; Manning C.J.; Young J.; Cooper A.
发表日期	2020
ISSN	0027-8424
起始页码	3996
结束页码	4006
卷号	117 期号:8
英文摘要	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. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Antarctic ice sheets; Marine ice sheet instability (MISI); Paleoclimatology; Polar amplification; Tipping element
语种	英语
scopus关键词	Antarctica; article; body weight; DNA determination; environmental change; hydration; ice sheet; interglacial; paleoclimatology; sea ice; sea level; warming; Weddell Sea
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/158851
作者单位	Turney, C.S.M., Palaeontology, Geobiology and Earth Archives Research Centre, School of Biological, Earth and Environmental Sciences, University of New South Wales, Kensington, NSW 2033, Australia, Australian Research Council Centre of Excellence in Australian Biodiversity and Heritage, School of Biological, Earth and Environmental Sciences, University of New South Wales, Kensington, NSW 2033, Australia, Chronos 14Carbon-Cycle Facility, University of New South Wales, Sydney, NSW 2052, Australia; Fogwill, C.J., Palaeontology, Geobiology and Earth Archives Research Centre, School of Biological, Earth and Environmental Sciences, University of New South Wales, Kensington, NSW 2033, Australia, School of Geography, Geology and the Environment, Keele University, Staffordshire, ST5 5BG, United Kingdom; Golledge, N.R., Antarctic Research Centre, Victoria University of Wellington, Wellington, 6140, New Zealand, Environment and Climate, GNS Science, Avalon, Lower Hutt, 5011, New Zealand; McKay, N.P., School of E...
推荐引用方式 GB/T 7714	Turney C.S.M.,Fogwill C.J.,Golledge N.R.,et al. Early Last Interglacial ocean warming drove substantial ice mass loss from Antarctica[J],2020,117(8).
APA	Turney C.S.M..,Fogwill C.J..,Golledge N.R..,McKay N.P..,van Sebille E..,...&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,117(8).
MLA	Turney C.S.M.,et al."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(2020).