气候变化领域集成服务门户(CCPortal): A low climate threshold for south Greenland Ice Sheet demise during the Late Pleistocene

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DOI	10.1073/pnas.1911902116
	A low climate threshold for south Greenland Ice Sheet demise during the Late Pleistocene
	Irvalı N.; Galaasen E.V.; Ninnemann U.S.; Rosenthal Y.; Born A.; Kleiven H.F.
发表日期	2020
ISSN	0027-8424
起始页码	190
结束页码	195
卷号	117 期号:1
英文摘要	The Greenland Ice Sheet (GIS) has been losing mass at an accelerating rate over the recent decades. Models suggest a possible temperature threshold between 0.8 and 3.2 °C, beyond which GIS decline becomes irreversible. The duration of warmth above a given threshold is also a critical determinant for GIS survival, underlining the role of ocean warming, as its inertia prolongs warmth and triggers longer-term feedbacks. The exact point at which these feedbacks are triggered remains equivocal. Late Pleistocene interglacials provide potential case examples for constraining the past response of the GIS to a range of climate states, including conditions warmer than present. However, little is known about the magnitude and duration of warming near Greenland during these periods. Using high-resolution multiproxy surface ocean climate records off southern Greenland, we show that the previous 4 interglacials over the last ∼450 ka all reached warmer than present climate conditions and exceeded the modeled temperature threshold for GIS collapse but by different magnitudes and durations. Complete deglaciation of the southern GIS in Marine Isotope Stage 11c (MIS 11c; 394.7 to 424.2 ka) occurred under climates only slightly warmer than present (∼0.5 ± 1.6 °C), placing the temperature threshold for major GIS retreat in the lower end of model estimates and within projections for this century. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Climate change; Greenland Ice Sheet; Late Pleistocene interglacials; Thresholds
语种	英语
scopus关键词	Article; climate; deglaciation; ecosystem monitoring; environmental temperature; Greenland; ice sheet; isotope analysis; priority journal; sea; Upper Pleistocene
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/158856
作者单位	Irvalı, N., Department of Earth Science, University of Bergen, Bergen, 5007, Norway, Bjerknes Centre for Climate Research, Bergen, 5007, Norway; Galaasen, E.V., Department of Earth Science, University of Bergen, Bergen, 5007, Norway, Bjerknes Centre for Climate Research, Bergen, 5007, Norway; Ninnemann, U.S., Department of Earth Science, University of Bergen, Bergen, 5007, Norway, Bjerknes Centre for Climate Research, Bergen, 5007, Norway; Rosenthal, Y., Department of Marine and Coastal Sciences, Rutgers, State University of New Jersey, New Brunswick, NJ 08901, United States, Department of Earth and Planetary Sciences, Rutgers, State University of New Jersey, New Brunswick, NJ 08901, United States; Born, A., Department of Earth Science, University of Bergen, Bergen, 5007, Norway, Bjerknes Centre for Climate Research, Bergen, 5007, Norway; Kleiven, H.F., Department of Earth Science, University of Bergen, Bergen, 5007, Norway, Bjerknes Centre for Climate Research, Bergen, 5007, Norway
推荐引用方式 GB/T 7714	Irvalı N.,Galaasen E.V.,Ninnemann U.S.,et al. A low climate threshold for south Greenland Ice Sheet demise during the Late Pleistocene[J],2020,117(1).
APA	Irvalı N.,Galaasen E.V.,Ninnemann U.S.,Rosenthal Y.,Born A.,&Kleiven H.F..(2020).A low climate threshold for south Greenland Ice Sheet demise during the Late Pleistocene.Proceedings of the National Academy of Sciences of the United States of America,117(1).
MLA	Irvalı N.,et al."A low climate threshold for south Greenland Ice Sheet demise during the Late Pleistocene".Proceedings of the National Academy of Sciences of the United States of America 117.1(2020).