气候变化领域集成服务门户(CCPortal): A new sea-level record for the Neogene/Quaternary boundary reveals transition to a more stable East Antarctic Ice Sheet

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DOI	10.1073/pnas.2004209117
	A new sea-level record for the Neogene/Quaternary boundary reveals transition to a more stable East Antarctic Ice Sheet
	Jakob K.A.; Wilson P.A.; Pross J.; Ezard T.H.G.; Fiebig J.; Repschläger J.; Friedrich O.
发表日期	2020
ISSN	0027-8424
起始页码	30980
结束页码	30987
卷号	117 期号:49
英文摘要	Sea-level rise resulting from the instability of polar continental ice sheets represents a major socioeconomic hazard arising from anthropogenic warming, but the response of the largest component of Earth's cryosphere, the East Antarctic Ice Sheet (EAIS), to global warming is poorly understood. Here we present a detailed record of North Atlantic deep-ocean temperature, global sea-level, and ice-volume change for ∼2.75 to 2.4 Ma ago, when atmospheric partial pressure of carbon dioxide (pCO2) ranged from presentday (>400 parts per million volume, ppmv) to preindustrial (<280 ppmv) values. Our data reveal clear glacial-interglacial cycles in global ice volume and sea level largely driven by the growth and decay of ice sheets in the Northern Hemisphere. Yet, sea-level values during Marine Isotope Stage (MIS) 101 (∼2.55 Ma) also signal substantial melting of the EAIS, and peak sea levels during MIS G7 (∼2.75 Ma) and, perhaps, MIS G1 (∼2.63 Ma) are also suggestive of EAIS instability. During the succeeding glacial-interglacial cycles (MIS 100 to 95), sea levels were distinctly lower than before, strongly suggesting a link between greater stability of the EAIS and increased land-ice volumes in the Northern Hemisphere. We propose that lower sea levels driven by ice-sheet growth in the Northern Hemisphere decreased EAIS susceptibility to ocean melting. Our findings have implications for future EAIS vulnerability to a rapidly warming world. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	East Antarctic Ice Sheet; Intensification of Northern Hemisphere Glaciation; Ocean-cryosphere interaction; Sea level
语种	英语
scopus关键词	carbon dioxide; Antarctica; Article; continental ice; environmental temperature; glaciation; ice sheet; interglacial; melting point; Neogene; Northern Hemisphere; partial pressure; priority journal; Quaternary (period); sea level
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/158836
作者单位	Jakob, K.A., Institute of Earth Sciences, Heidelberg University, Heidelberg, 69120, Germany; Wilson, P.A., University of Southampton, Waterfront Campus, National Oceanography Centre, Southampton, SO14 3ZH, United Kingdom; Pross, J., Institute of Earth Sciences, Heidelberg University, Heidelberg, 69120, Germany; Ezard, T.H.G., University of Southampton, Waterfront Campus, National Oceanography Centre, Southampton, SO14 3ZH, United Kingdom; Fiebig, J., Institute of Geosciences, Goethe-University Frankfurt, Frankfurt, 60438, Germany; Repschläger, J., Climate Geochemistry Department, Max Planck Institute for Chemistry, Mainz, 55128, Germany; Friedrich, O., Institute of Earth Sciences, Heidelberg University, Heidelberg, 69120, Germany
推荐引用方式 GB/T 7714	Jakob K.A.,Wilson P.A.,Pross J.,et al. A new sea-level record for the Neogene/Quaternary boundary reveals transition to a more stable East Antarctic Ice Sheet[J],2020,117(49).
APA	Jakob K.A..,Wilson P.A..,Pross J..,Ezard T.H.G..,Fiebig J..,...&Friedrich O..(2020).A new sea-level record for the Neogene/Quaternary boundary reveals transition to a more stable East Antarctic Ice Sheet.Proceedings of the National Academy of Sciences of the United States of America,117(49).
MLA	Jakob K.A.,et al."A new sea-level record for the Neogene/Quaternary boundary reveals transition to a more stable East Antarctic Ice Sheet".Proceedings of the National Academy of Sciences of the United States of America 117.49(2020).