globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2016.09.014
论文题名:
Final Laurentide ice-sheet deglaciation and Holocene climate-sea level change
作者: Ullman D.J.; Carlson A.E.; Hostetler S.W.; Clark P.U.; Cuzzone J.; Milne G.A.; Winsor K.; Caffee M.
刊名: Quaternary Science Reviews
出版年: 2016
卷: 152
起始页码: 49
结束页码: 59
语种: 英语
英文关键词: Holocene ; Laurentide ice sheet ; Sea level rise ; Surface exposure dating
Scopus关键词: Climate change ; Climate models ; Domes ; Glaciers ; Sea level ; Global mean sea levels ; Holocenes ; Last Glacial Maximum ; Laurentide ice sheets ; Regional climate model simulation ; Sea level rise ; Surface exposure age ; Surface exposure dating ; Ice ; climate modeling ; dating method ; deglaciation ; Holocene ; ice retreat ; ice shelf ; insolation ; Last Glacial Maximum ; Laurentide Ice Sheet ; regional climate ; sea level change ; Antarctic Ice Sheet ; Antarctica ; Atlantic Ocean ; Atlantic Ocean (North) ; Canada ; Hudson Bay
英文摘要: Despite elevated summer insolation forcing during the early Holocene, global ice sheets retained nearly half of their volume from the Last Glacial Maximum, as indicated by deglacial records of global mean sea level (GMSL). Partitioning the GMSL rise among potential sources requires accurate dating of ice-sheet extent to estimate ice-sheet volume. Here, we date the final retreat of the Laurentide Ice Sheet with 10Be surface exposure ages for the Labrador Dome, the largest of the remnant Laurentide ice domes during the Holocene. We show that the Labrador Dome deposited moraines during North Atlantic cold events at ∼10.3 ka, 9.3 ka and 8.2 ka, suggesting that these regional climate events helped stabilize the retreating Labrador Dome in the early Holocene. After Hudson Bay became seasonally ice free at ∼8.2 ka, the majority of Laurentide ice-sheet melted abruptly within a few centuries. We demonstrate through high-resolution regional climate model simulations that the thermal properties of a seasonally ice-free Hudson Bay would have increased Laurentide ice-sheet ablation and thus contributed to the subsequent rapid Labrador Dome retreat. Finally, our new 10Be chronology indicates full Laurentide ice-sheet had completely deglaciated by 6.7 ± 0.4 ka, which re quires that Antarctic ice sheets contributed 3.6–6.5 m to GMSL rise since 6.3–7.1 ka. © 2016 Elsevier Ltd
资助项目: Ullman, D.J. ; Department of Geosciences, Northland CollegeUnited States ; 电子邮件: dullman@northland.edu
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59409
Appears in Collections:过去全球变化的重建

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作者单位: Department of Geosciences, Northland College, Ashland, WI, United States; College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, United States; Department of Geoscience, University of Wisconsin-Madison, Madison, WI, United States; U.S. Geological Survey, Corvallis, OR, United States; NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Department of Earth Sciences, University of Ottawa, Ottawa, Canada; Department of Environmental, Earth and Atmospheric Sciences, University of Massachusetts-Lowell, Lowell, MA, United States; Department of Physics, PRIME Lab, Purdue University, West Lafayette, IN, United States; Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, IN, United States

Recommended Citation:
Ullman D.J.,Carlson A.E.,Hostetler S.W.,et al. Final Laurentide ice-sheet deglaciation and Holocene climate-sea level change[J]. Quaternary Science Reviews,2016-01-01,152
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