globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo1890
论文题名:
Ice sheet collapse following a prolonged period of stable sea level during the last interglacial
作者: O'Leary M.J.; Hearty P.J.; Thompson W.G.; Raymo M.E.; Mitrovica J.X.; Webster J.M.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2013
卷: 6, 期:9
起始页码: 796
结束页码: 800
语种: 英语
Scopus关键词: abandoned land ; coral reef ; eustacy ; fossil record ; geochronology ; geomorphological mapping ; geophysical method ; ice breakup ; ice sheet ; Last Interglacial ; magnitude ; sea level ; uranium series dating ; Australia ; Western Australia ; Anthozoa
英文摘要: During the last interglacial period, 127-116 kyr ago, global mean sea level reached a peak of 5-9m above present-day sea level. However, the exact timing and magnitude of ice sheet collapse that contributed to the sea-level highstand is unclear. Here we explore this timing using stratigraphic and geomorphic mapping and uranium-series geochronology of fossil coral reefs and geophysical modelling of sea-level records from Western Australia. We show that between 127 and 119 kyr ago, eustatic sea level remained relatively stable at about 3-4 m above present sea level. However, stratigraphically younger fossil corals with U-series ages of 118.1±1.4 kyr are observed at elevations of up to 9.5 m above present mean sea level. Accounting for glacial isostatic adjustment and localized tectonics, we conclude that eustatic sea level rose to about 9 m above present at the end of the last interglacial. We suggest that in the last few thousand years of the interglacial, a critical ice sheet stability threshold was crossed, resulting in the catastrophic collapse of polar ice sheets and substantial sea-level rise. © 2013 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/106710
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 Environment and Agriculture, Curtin University, Bentley, WA 6102, Australia; Department of Environmental Studies, University of North Carolina, Wilmington, NC 28403, United States; Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, United States; Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964, United States; Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, United States; Geocoastal Research Group, School of Geosciences, University of Sydney, NSW 2006, Australia

Recommended Citation:
O'Leary M.J.,Hearty P.J.,Thompson W.G.,et al. Ice sheet collapse following a prolonged period of stable sea level during the last interglacial[J]. Nature Geoscience,2013-01-01,6(9)
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