气候变化领域集成服务门户(CCPortal): Ice-shelf collapse from subsurface warming as a trigger for Heinrich events

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DOI	10.1073/pnas.1104772108
	Ice-shelf collapse from subsurface warming as a trigger for Heinrich events
	Marcott S.A.; Clark P.U.; Padman L.; Klinkhammer G.P.; Springer S.R.; Liu Z.; Otto-Bliesner B.L.; Carlson A.E.; Ungerer A.; Padman J.; He F.; Cheng J.; Schmittner A.
发表日期	2011
ISSN	0027-8424
起始页码	13415
结束页码	13419
卷号	108 期号:33
英文摘要	Episodic iceberg-discharge events from the Hudson Strait Ice Stream (HSIS) of the Laurentide Ice Sheet, referred to as Heinrich events, are commonly attributed to internal ice-sheet instabilities, but their systematic occurrence at the culmination of a large reduction in the Atlantic meridional overturning circulation (AMOC) indicates a climate control. We report Mg/Ca data on benthic foraminifera from an intermediate-depth site in the northwest Atlantic and results from a climate-model simulation that reveal basin-wide subsurface warming at the same time as large reductions in the AMOC, with temperature increasing by approximately 2°C over a 1-2 kyr interval prior to a Heinrich event. In simulations with an ocean model coupled to a thermodynamically active ice shelf, the increase in subsurface temperature increases basal melt rate under an ice shelf fronting the HSIS by a factor of approximately 6. By analogy with recent observations in Antarctica, the resulting ice-shelf loss and attendant HSIS acceleration would produce a Heinrich event.
英文关键词	Abrupt climate change; Paleoceanography; Paleoclimatology
语种	英语
scopus关键词	calcium; magnesium; Antarctica; article; benthic foraminifera; climate; heinrich event; Holocene; ice shelf; nonhuman; North Atlantic deep water; priority journal; simulation; temperature measurement; thermodynamics; warming; Calcium; Climate; Foraminifera; Greenhouse Effect; Ice Cover; Magnesium; Oceans and Seas; Temperature; Water Movements; Foraminifera
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/159143
作者单位	Marcott, S.A., Department of Geosciences, Oregon State University, Corvallis, OR 97331, United States; Clark, P.U., Department of Geosciences, Oregon State University, Corvallis, OR 97331, United States; Padman, L., Earth and Space Research, 3350 SW Cascade Avenue, Corvallis, OR 97333, United States; Klinkhammer, G.P., College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, United States; Springer, S.R., Earth and Space Research, 2101 Fourth Avenue, Seattle, WA 98121, United States; Liu, Z., Center for Climatic Research, Department of Atmospheric and Oceanic Sciences, University of Wisconsin, Madison, WI 53706, United States; Otto-Bliesner, B.L., Climate and Global Dynamics Division, National Center for Atmospheric Research, Boulder, CO 80307, United States; Carlson, A.E., Center for Climatic Research, Department of Atmospheric and Oceanic Sciences, University of Wisconsin, Madison, WI 53706, United States, Department of Geoscience, University of Wisconsin, Madison, WI 5...
推荐引用方式 GB/T 7714	Marcott S.A.,Clark P.U.,Padman L.,et al. Ice-shelf collapse from subsurface warming as a trigger for Heinrich events[J],2011,108(33).
APA	Marcott S.A..,Clark P.U..,Padman L..,Klinkhammer G.P..,Springer S.R..,...&Schmittner A..(2011).Ice-shelf collapse from subsurface warming as a trigger for Heinrich events.Proceedings of the National Academy of Sciences of the United States of America,108(33).
MLA	Marcott S.A.,et al."Ice-shelf collapse from subsurface warming as a trigger for Heinrich events".Proceedings of the National Academy of Sciences of the United States of America 108.33(2011).