globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2463
论文题名:
Laurentide ice-sheet instability during the last deglaciation
作者: Ullman D.J.; Carlson A.E.; Anslow F.S.; Legrande A.N.; Licciardi J.M.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2015
卷: 8, 期:7
起始页码: 534
结束页码: 537
语种: 英语
英文摘要: Changes in the amount of summer incoming solar radiation (insolation) reaching the Northern Hemisphere are the underlying pacemaker of glacial cycles. However, not all rises in boreal summer insolation over the past 800,000 years resulted in deglaciation to present-day ice volumes, suggesting that there may be a climatic threshold for the disappearance of land-based ice. Here we assess the surface mass balance stability of the Laurentide ice sheet-the largest glacial ice mass in the Northern Hemisphere-during the last deglaciation (24,000 to 9,000 years ago). We run a surface energy balance model with climate data from simulations with a fully coupled atmosphere-ocean general circulation model for key time slices during the last deglaciation. We find that the surface mass balance of the Laurentide ice sheet was positive throughout much of the deglaciation, and suggest that dynamic discharge was mainly responsible for mass loss during this time. Total surface mass balance became negative only in the early Holocene, indicating the transition to a new state where ice loss occurred primarily by surface ablation. We conclude that the Laurentide ice sheet remained a viable ice sheet before the Holocene and began to fully deglaciate only once summer temperatures and radiative forcing over the ice sheet increased by 6-7 °C and 16-20 W m â 2, respectively, relative to full glacial conditions. © 2015 Macmillan Publishers Limited. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106347
Appears in Collections:气候减缓与适应
科学计划与规划

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作者单位: Department of Geoscience, University of Wisconsin-Madison, Madison, WI, United States; College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, United States; Pacific Climate Impacts Consortium, University of Victoria, Victoria, BC, Canada; NASA Goddard Institute for Space Studies, Center for Climate System Research, Columbia University, New York, NY, United States; Department of Earth Sciences, University of New Hampshire, Durham, NH, United States

Recommended Citation:
Ullman D.J.,Carlson A.E.,Anslow F.S.,et al. Laurentide ice-sheet instability during the last deglaciation[J]. Nature Geoscience,2015-01-01,8(7)
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