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DOI	10.5194/tc-15-459-2021
	Sensitivity of the Antarctic ice sheets to the warming of marine isotope substage 11c
	Mas E Braga M.; Bernales J.; Prange M.; P. Stroeven A.; Rogozhina I.
发表日期	2021
ISSN	19940416
起始页码	459
结束页码	478
卷号	15 期号:1
英文摘要	Studying the response of the Antarctic ice sheets during periods when climate conditions were similar to the present can provide important insights into current observed changes and help identify natural drivers of ice sheet retreat. In this context, the marine isotope substage 11c (MIS11c) interglacial offers a suitable scenario, given that during its later portion orbital parameters were close to our current interglacial. Ice core data indicate that warmer-than-present temperatures lasted for longer than during other interglacials. However, the response of the Antarctic ice sheets and their contribution to sea level rise remain unclear. We explore the dynamics of the Antarctic ice sheets during this period using a numerical ice sheet model forced by MIS11c climate conditions derived from climate model outputs scaled by three glaciological and one sedimentary proxy records of ice volume. Our results indicate that the East and West Antarctic ice sheets contributed 4.0-8.2 m to the MIS11c sea level rise. In the case of a West Antarctic Ice Sheet collapse, which is the most probable scenario according to far-field sea level reconstructions, the range is reduced to 6.7-8.2 m independently of the choices of external sea level forcing and millennial-scale climate variability. Within this latter range, the main source of uncertainty arises from the sensitivity of the East Antarctic Ice Sheet to a choice of initial ice sheet configuration. We found that the warmer regional climate signal captured by Antarctic ice cores during peak MIS11c is crucial to reproduce the contribution expected from Antarctica during the recorded global sea level highstand. This climate signal translates to a modest threshold of 0.4 C oceanic warming at intermediate depths, which leads to a collapse of the West Antarctic Ice Sheet if sustained for at least 4000 years. © 2021 Copernicus GmbH. All rights reserved.
英文关键词	climate conditions; climate modeling; climate signal; climate variation; collapse; interglacial; marine isotope stage; sea level change; Antarctic Ice Sheet; Antarctica; East Antarctic Ice Sheet; East Antarctica; West Antarctic Ice Sheet; West Antarctica
语种	英语
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202376
作者单位	Geomorphology and Glaciology, Department of Physical Geography, Stockholm University, Stockholm, Sweden; Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden; Marum - Center for Marine Environmental Sciences, University of Bremen, Bremen, Germany; Department of Geography, Norwegian University of Science and Technology, Trondheim, Norway
推荐引用方式 GB/T 7714	Mas E Braga M.,Bernales J.,Prange M.,et al. Sensitivity of the Antarctic ice sheets to the warming of marine isotope substage 11c[J],2021,15(1).
APA	Mas E Braga M.,Bernales J.,Prange M.,P. Stroeven A.,&Rogozhina I..(2021).Sensitivity of the Antarctic ice sheets to the warming of marine isotope substage 11c.Cryosphere,15(1).
MLA	Mas E Braga M.,et al."Sensitivity of the Antarctic ice sheets to the warming of marine isotope substage 11c".Cryosphere 15.1(2021).