globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1104772108
论文题名:
Ice-shelf collapse from subsurface warming as a trigger for Heinrich events
作者: 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.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2011
卷: 108, 期:33
起始页码: 13415
结束页码: 13419
语种: 英语
英文关键词: Abrupt climate change ; Paleoceanography ; Paleoclimatology
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
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162423
Appears in Collections:气候变化与战略

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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 53706, United States; Ungerer, A., College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, United States; Padman, J., College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, United States; He, F., Center for Climatic Research, Department of Atmospheric and Oceanic Sciences, University of Wisconsin, Madison, WI 53706, United States; Cheng, J., Key Laboratory of Meteorological Disaster, Nanjing University of Information Science and Technology, Nanjing, 210044, China; Schmittner, A., College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, United States

Recommended Citation:
Marcott S.A.,Clark P.U.,Padman L.,et al. Ice-shelf collapse from subsurface warming as a trigger for Heinrich events[J]. Proceedings of the National Academy of Sciences of the United States of America,2011-01-01,108(33)
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