DOI: 10.1016/j.epsl.2018.04.054
Scopus记录号: 2-s2.0-85047014240
论文题名: Pliocene deglacial event timelines and the biogeochemical response offshore Wilkes Subglacial Basin, East Antarctica
作者: Bertram R.A. ; Wilson D.J. ; van de Flierdt T. ; McKay R.M. ; Patterson M.O. ; Jimenez-Espejo F.J. ; Escutia C. ; Duke G.C. ; Taylor-Silva B.I. ; Riesselman C.R.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 494 起始页码: 109
结束页码: 116
语种: 英语
英文关键词: deglacial timescales
; East Antarctic Ice Sheet
; Pliocene
; provenance
; radiogenic isotopes
; Wilkes Subglacial Basin
Scopus关键词: Debris
; Geology
; Glaciers
; Productivity
; Sea ice
; Sediments
; East antarctic ice sheets
; Pliocene
; provenance
; Radiogenic isotopes
; Time-scales
; Wilkes Subglacial Basin
; Sea level
; deglaciation
; ice cover
; ice margin
; ice retreat
; iceberg
; isotopic analysis
; Pliocene
; provenance
; sea level change
; Antarctica
; East Antarctica
; Wilkes Subglacial Basin
英文摘要: Significantly reduced ice coverage in Greenland and West Antarctica during the warmer-than-present Pliocene could account for ∼10 m of global mean sea level rise. Any sea level increase beyond this would require contributions from the East Antarctic Ice Sheet (EAIS). Previous studies have presented low-resolution geochemical evidence from the geological record, suggesting repeated ice advance and retreat in low-lying areas of the EAIS such as the Wilkes Subglacial Basin. However, the rates and mechanisms of retreat events are less well constrained. Here we present orbitally-resolved marine detrital sediment provenance data, paired with ice-rafted debris and productivity proxies, during three time intervals from the middle to late Pliocene at IODP Site U1361A, offshore of the Wilkes Subglacial Basin. Our new data reveal that Pliocene shifts in sediment provenance were paralleled by increases in marine productivity, while the onset of such changes was marked by peaks in ice-rafted debris mass accumulation rates. The coincidence of sediment provenance and marine productivity change argues against a switch in sediment delivery between ice streams, and instead suggests that deglacial warming triggered increased rates of iceberg calving, followed by inland retreat of the ice margin. Timescales from the onset of deglaciation to an inland retreated ice margin within the Wilkes Subglacial Basin are on the order of several thousand years. This geological evidence corroborates retreat rates determined from ice sheet modeling, and a contribution of ∼3 to 4 m of equivalent sea level rise from one of the most vulnerable areas of the East Antarctic Ice Sheet during interglacial intervals throughout the middle to late Pliocene. © 2018 The Authors Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109850
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Dept. Earth Science and Engineering, Imperial College London, United Kingdom; Grantham Institute – Climate Change and the Environment, Imperial College London, United Kingdom; Antarctic Research Centre, Victoria University of Wellington, Wellington, New Zealand; Binghamton University, New York, United States; Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Japan; Instituto Andaluz de Ciencias de la Tierra, CSIC-Universidad de Granada, Spain; Dept. of Geology, University of Otago, Dunedin, New Zealand; Dept. of Marine Science, University of Otago, Dunedin, New Zealand
Recommended Citation:
Bertram R.A.,Wilson D.J.,van de Flierdt T.,et al. Pliocene deglacial event timelines and the biogeochemical response offshore Wilkes Subglacial Basin, East Antarctica[J]. Earth and Planetary Science Letters,2018-01-01,494