DOI: 10.1038/ngeo2478
论文题名: Accumulation and marine forcing of ice dynamics in the western Ross Sea during the last deglaciation
作者: Hall B.L. ; Denton G.H. ; Heath S.L. ; Jackson M.S. ; Koffman T.N.B.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2015
卷: 8, 期: 8 起始页码: 625
结束页码: 628
语种: 英语
Scopus关键词: atmospheric forcing
; geoaccumulation
; geochronology
; glacier dynamics
; ice sheet
; ice thickness
; last deglaciation
; Last Glacial Maximum
; marine environment
; moraine
; paleoclimate
; paleoenvironment
; radiocarbon dating
; reconstruction
; Antarctica
; East Antarctica
; McMurdo Sound
; Ross Sea
; Southern Ocean
英文摘要: The grounding line of the ice sheet in the Ross Sea, Antarctica, retreated between the Last Glacial Maximum and the present. However, the timing of the retreat and the interplay of factors controlling ice stability in this region remain uncertain. Here we use 180 radiocarbon dates to reconstruct the chronology of moraine construction on the headlands adjacent to western McMurdo Sound. On the basis of these dates we then assess the timing of ice expansion and retreat in the Ross drainage system that is fed from both the East and West Antarctic ice sheets. We find that grounded ice in the western Ross Sea achieved its greatest thickness and extent during the last termination, between 12,800 and 18,700 years ago. Maximum ice thickness at our site coincides with a period of high accumulation as recorded by the West Antarctic Ice Sheet Divide ice core. Recession of the ice sheet from the headland moraines began about 12,800 years ago, despite continued high accumulation and the expansion of land-based glaciers at this time. We therefore suggest that the grounding-line retreat reflects an increased marine influence as sea levels rose and the ocean warmed. We suggest that future instability in the ice sheet grounding line may occur whenever the ocean forcing is stronger than forcing from accumulation. © 2015 Macmillan Publishers Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106307
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: School of Earth and Climate Sciences, Climate Change Institute, University of Maine, Orono, Maine, United States; Department of Geology, University of Cincinnati, Cincinnati, OH, United States; Department of Earth Sciences, Dartmouth College, Hanover, New Hampshire, United States; Geochemistry, Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States
Recommended Citation:
Hall B.L.,Denton G.H.,Heath S.L.,et al. Accumulation and marine forcing of ice dynamics in the western Ross Sea during the last deglaciation[J]. Nature Geoscience,2015-01-01,8(8)