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DOI	10.1126/science.aat7067
	The residence time of Southern Ocean surface waters and the 100,000-year ice age cycle
	Hasenfratz A.P.; Jaccard S.L.; Martínez-García A.; Sigman D.M.; Hodell D.A.; Vance D.; Bernasconi S.M.; Kleiven H.F.; Haumann F.A.; Haug G.H.
发表日期	2019
ISSN	0036-8075
起始页码	1080
结束页码	1084
卷号	363 期号:6431
英文摘要	From 1.25 million to 700,000 years ago, the ice age cycle deepened and lengthened from 41,000- to 100,000-year periodicity, a transition that remains unexplained. Using surface- and bottom-dwelling foraminifera from the Antarctic Zone of the Southern Ocean to reconstruct the deep-to-surface supply of water during the ice ages of the past 1.5 million years, we found that a reduction in deep water supply and a concomitant freshening of the surface ocean coincided with the emergence of the high-amplitude 100,000-year glacial cycle. We propose that this slowing of deep-to-surface circulation (i.e., a longer residence time for Antarctic surface waters) prolonged ice ages by allowing the Antarctic halocline to strengthen, which increased the resistance of the Antarctic upper water column to orbitally paced drivers of carbon dioxide release. 2017 © The Authors, some rights reserved.
英文关键词	carbon dioxide; deep water; foraminifera; glacial-interglacial cycle; halocline; paleoceanography; Pleistocene; residence time; water column; water supply; Antarctica; Article; circulation; density gradient; glacier; greenhouse effect; ice age; periodicity; phytoplankton; plankton; priority journal; salinity; sea surface temperature; sea surface waters; seasonal variation; Southern Ocean; surface water hydrology; water residence time; Antarctica; Southern Ocean; Foraminifera
语种	英语
来源期刊	Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/243964
作者单位	Geological Institute, Department of Earth Sciences, ETH Zürich, Zürich, Switzerland; Institute of Geological Sciences, Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland; Max Planck Institute for Chemistry, Mainz, Germany; Department of Geosciences, Guyot Hall, Princeton University, Princeton, NJ, United States; Department of Earth Sciences, University of Cambridge, Cambridge, United Kingdom; Institute of Geochemistry and Petrology, ETH Zürich, Zürich, Switzerland; Department of Earth Science, University of Bergen, Bjerknes Centre for Climate Research, Bergen, Norway; British Antarctic Survey, Cambridge, United Kingdom; Atmospheric and Oceanic Sciences, Princeton University, Princeton, NJ, United States
推荐引用方式 GB/T 7714	Hasenfratz A.P.,Jaccard S.L.,Martínez-García A.,et al. The residence time of Southern Ocean surface waters and the 100,000-year ice age cycle[J],2019,363(6431).
APA	Hasenfratz A.P..,Jaccard S.L..,Martínez-García A..,Sigman D.M..,Hodell D.A..,...&Haug G.H..(2019).The residence time of Southern Ocean surface waters and the 100,000-year ice age cycle.Science,363(6431).
MLA	Hasenfratz A.P.,et al."The residence time of Southern Ocean surface waters and the 100,000-year ice age cycle".Science 363.6431(2019).