DOI: 10.1016/j.quascirev.2014.10.025
Scopus记录号: 2-s2.0-84910655272
论文题名: Tropical tales of polar ice: Evidence of Last Interglacial polar ice sheet retreat recorded by fossil reefs of the granitic Seychelles islands
作者: Dutton A. ; Webster J.M. ; Zwartz D. ; Lambeck K. ; Wohlfarth B.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 107 起始页码: 2147483647
语种: 英语
英文关键词: Coral
; MIS 5e
; Sea level
; Seychelles
; U-Th
Scopus关键词: Budget control
; Glacial geology
; Glaciers
; Sea level
; Thermal expansion
; Antarctic ice sheets
; Coral
; East antarctic ice sheets
; Eustatic sea level
; Greenland Ice Sheet
; Mountain glaciers
; Northern Hemispheres
; Seychelles
; Ice
; coral reef
; fossil record
; glacial-interglacial cycle
; ice sheet
; Last Interglacial
; meltwater
; Northern Hemisphere
; sea level change
; timescale
; Arctic
; Greenland
; Greenland Ice Sheet
; Seychelles
; Anthozoa
英文摘要: In the search for a record of eustatic sea level change on glacial-interglacial timescales, the Seychelles ranks as one of the best places on the planet to study. Owing to its location with respect to the former margins of Northern Hemisphere ice sheets that wax and wane on orbital cycles, the local-or relative-sea level history is predicted to lie within a few meters of the globally averaged eustatic signal during the Last Interglacial period. We have surveyed and dated Last Interglacial fossil corals to ascertain peak sea level and hence infer maximum retreat of polar ice sheets during this time interval. We observe a pattern of gradually rising sea level in the Seychelles between ~129 and 125 thousand years ago (ka), with peak eustatic sea level attained after 125ka at 7.6±1.7mhigher than present. After accounting for thermal expansion and loss of mountain glaciers, this sea-level budget would require ~5-8mof polar ice sheet contribution, relative to today's volume, of which only ~2mcame from the Greenland ice sheet. This result clearly identifies the Antarctic ice sheet as a significant source of melt water, most likely derived from one of the unstable, marine-based sectors in the West and/or East Antarctic ice sheet. Furthermore, the establishment of a+5.9±1.7m eustatic sea level position by 128.6±0.8ka would require that partial AIS collapse was coincident with the onset of the sea level highstand. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60082
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geological Sciences, University of Florida, Gainesville, FL, United States; Research School of Earth Sciences, The Australian National University, Canberra, ACT, Australia; Geocoastal Research Group, School of Geosciences, University of SydneyNSW, Australia; Antarctic Research Centre, Victoria University of Wellington, Wellington, New Zealand; Department of Geological Sciences, Stockholm University, Stockholm, Sweden
Recommended Citation:
Dutton A.,Webster J.M.,Zwartz D.,et al. Tropical tales of polar ice: Evidence of Last Interglacial polar ice sheet retreat recorded by fossil reefs of the granitic Seychelles islands[J]. Quaternary Science Reviews,2015-01-01,107