DOI: 10.1038/ngeo1859
论文题名: Barbados-based estimate of ice volume at Last Glacial Maximum affected by subducted plate
作者: Austermann J. ; Mitrovica J.X. ; Latychev K. ; Milne G.A.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2013
卷: 6, 期: 7 起始页码: 553
结束页码: 557
语种: 英语
Scopus关键词: coral
; fossil fuel
; ice sheet
; Last Glacial Maximum
; sea level change
; subduction zone
; viscoelasticity
; volume
; Atlantic Ocean
; Barbados
; Caribbean Sea
; Anthozoa
英文摘要: The record of sea-level change at Barbados derived from the dating of fossil corals has been used to argue that globally averaged, or eustatic, sea level during the Last Glacial Maximum was approximately 120 m below present. This estimate is roughly 10 m lower than inferences based on sea-level data from other far-field sites and, if correct, would suggest that the Barbados record is a largely uncontaminated measure of eustasy. However, these previous analyses were based on numerical corrections for glacial isostatic adjustment that adopted one-dimensional viscoelastic Earth models. Here we assess the impact of three-dimensional mantle viscoelastic structure on predictions of post-glacial sea-level change at Barbados. Our simulations indicate that the predictions are strongly perturbed by the presence of a high-viscosity slab associated with subduction of the South American Plate beneath the Caribbean Plate. The slab suppresses local deformation and reduces the sea-level rise predicted during the deglaciation phase. To accommodate this reduction while maintaining a fit to the Barbados sea-level record requires an excess ice volume at the Last Glacial Maximum equivalent to about 130 m of eustatic sea-level rise. Given a downward revision in estimates of the Antarctic ice sheet contribution to this excess ice volume, we conclude that a significant amount of Northern Hemisphere ice at the Last Glacial Maximum remains unaccounted for in sea-level-based ice sheetreconstructions. © 2013 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106750
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 Earth and Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, MA 02138, United States; Department of Physics, University of Toronto, Toronto, ON M5S 1A7, Canada; Department of Earth Sciences, University of Ottawa, Ottawa, ON K1N 6N5, Canada
Recommended Citation:
Austermann J.,Mitrovica J.X.,Latychev K.,et al. Barbados-based estimate of ice volume at Last Glacial Maximum affected by subducted plate[J]. Nature Geoscience,2013-01-01,6(7)