气候变化领域集成服务门户(CCPortal): Southern Ocean temperature records and ice-sheet models demonstrate rapid Antarctic ice sheet retreat under low atmospheric CO2 during Marine Isotope Stage 31

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DOI	10.1016/j.quascirev.2019.106069
	Southern Ocean temperature records and ice-sheet models demonstrate rapid Antarctic ice sheet retreat under low atmospheric CO2 during Marine Isotope Stage 31
	Catherine B.; Golledge N.R.; Christian O.; Kowalewski D.E.; Marie-Alexandrine S.; Hageman K.J.; Robert S.; Wilson G.S.; François M.
发表日期	2020
ISSN	0277-3791
卷号	228
英文摘要	Over the last 5 million years, the Earth's climate has oscillated between warm (interglacial) and cold (glacial) states. Some particularly warm interglacial periods (i.e. ‘super-interglacials’) occurred under low atmospheric CO2 and may have featured extensive Antarctic ice sheet collapse. Here we focus on an extreme super-interglacial known as Marine Isotope Stage 31 (MIS31), between 1.085 and 1.055 million years ago and is the subject of intense discussion. We reconstructed the first Southern Ocean and Antarctic margin sea surface temperatures (SSTs) from organic biomarkers and used them to constrain numerical ice sheet-shelf simulations. Our SSTs indicate that the ocean was on average 5 °C (±1.2 °C) warmer in summer than today between 50 °S and the Antarctic ice margin. Our most conservative ice sheet simulation indicates a complete collapse of the West Antarctic Ice Sheet (WAIS) with additional deflation of the East Antarctic Ice Sheet. We suggest the WAIS retreated because of anomalously high Southern Hemisphere insolation coupled with the intrusion of Circumpolar Deep Water onto the continental shelf under poleward-intensified winds leading to a shorter sea ice season and ocean warming at the continental margin. In this scenario, the extreme warming we observed likely reflects the extensively modified oceanic and hydrologic system following ice sheet collapse. Our work highlights the sensitivity of the Antarctic ice sheets to minor oceanic perturbations that could also be at play for future changes. © 2019
英文关键词	Antarctica; Organic geochemistry; Paleoceanography; Paleoclimate modelling; Pleistocene; Southern ocean; Super-interglacial
语种	英语
scopus关键词	Carbon dioxide; Climatology; Earth (planet); Geochemistry; Glacial geology; Glaciers; Isotopes; Sea ice; Surface waters; Antarctica; Organic geochemistry; Paleoceanography; Paleoclimate modelling; Pleistocene; Southern ocean; Super-interglacial; Oceanography; carbon dioxide; continental shelf; ice sheet; interglacial; marine isotope stage; paleoceanography; paleoclimate; Pleistocene; Southern Hemisphere; Antarctic Ice Sheet; Antarctica; East Antarctic Ice Sheet; East Antarctica; Southern Ocean; West Antarctic Ice Sheet; West Antarctica
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151643
作者单位	Department of Marine Science, University of Otago, PO Box 56, Dunedin, 9054, New Zealand; Antarctic Research Centre, Victoria University of Wellington, Wellington, 6140, New Zealand; GNS Science, Avalon, Lower Hutt, 5011, New Zealand; Department of Geology, University of Otago, PO Box 56, Dunedin, 9054, New Zealand; Department of Earth, Environment, and Physics, Worcester State University, Worcester, MA 01602, United States; Sorbonne Universités (UPMC, Univ. Paris 06)-CNRS-IRD-MNHN, LOCEAN Laboratory, 4 Place Jussieu, Paris, F-75005, France; Department of Chemistry, University of Otago, PO Box 56, Dunedin, 9054, New Zealand
推荐引用方式 GB/T 7714	Catherine B.,Golledge N.R.,Christian O.,et al. Southern Ocean temperature records and ice-sheet models demonstrate rapid Antarctic ice sheet retreat under low atmospheric CO2 during Marine Isotope Stage 31[J],2020,228.
APA	Catherine B..,Golledge N.R..,Christian O..,Kowalewski D.E..,Marie-Alexandrine S..,...&François M..(2020).Southern Ocean temperature records and ice-sheet models demonstrate rapid Antarctic ice sheet retreat under low atmospheric CO2 during Marine Isotope Stage 31.Quaternary Science Reviews,228.
MLA	Catherine B.,et al."Southern Ocean temperature records and ice-sheet models demonstrate rapid Antarctic ice sheet retreat under low atmospheric CO2 during Marine Isotope Stage 31".Quaternary Science Reviews 228(2020).