DOI: 10.1016/j.quascirev.2013.10.016
Scopus记录号: 2-s2.0-84903764976
论文题名: Reconstruction of changes in the Amundsen Sea and Bellingshausen Sea sector of the West Antarctic Ice Sheet since the Last Glacial Maximum
作者: Larter R.D. ; Anderson J.B. ; Graham A.G.C. ; Gohl K. ; Hillenbrand C.-D. ; Jakobsson M. ; Johnson J.S. ; Kuhn G. ; Nitsche F.O. ; Smith J.A. ; Witus A.E. ; Bentley M.J. ; Dowdeswell J.A. ; Ehrmann W. ; Klages J.P. ; Lindow J. ; Cofaigh C.T. ; Spiegel C.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 100 起始页码: 55
结束页码: 86
语种: 英语
英文关键词: Circumpolar deep water
; Continental shelf
; Cosmogenic isotope
; Diamicton
; Glacimarine
; Grounding line
; Holocene
; Ice sheet
; Ice stream
; Last Glacial Maximum
; Multibeam swath bathymetry
; Radiocarbon
; Sea level
; Sediment
; Subglacial meltwater
; Surface exposure age
Scopus关键词: Acoustic variables measurement
; Atmospheric movements
; Bottles
; Catchments
; Geochronology
; Glacial geology
; Glaciers
; Isotopes
; Sea level
; Sediments
; Submarine geology
; Continental shelves
; Cosmogenic isotopes
; Deep Water
; Diamicton
; Glacimarine
; Grounding line
; Holocenes
; Ice sheet
; Ice streams
; Last Glacial Maximum
; Radiocarbon
; Subglacial meltwater
; Surface exposure age
; Swath bathymetry
; Ice
; age determination
; continental shelf
; cosmogenic radionuclide
; diamicton
; geochronology
; grounding line
; Holocene
; ice sheet
; ice stream
; Last Glacial Maximum
; marine sediment
; radiocarbon dating
; subglacial deposit
; swath bathymetry
; Amundsen Sea
; Bellingshausen Sea
; Southern Ocean
英文摘要: Marine and terrestrial geological and marine geophysical data that constrain deglaciation since the Last Glacial Maximum (LGM) of the sector of the West Antarctic Ice Sheet (WAIS) draining into the Amundsen Sea and Bellingshausen Sea have been collated and used as the basis for a set of time-slice reconstructions. The drainage basins in these sectors constitute a little more than one-quarter of the area of the WAIS, but account for about one-third of its surface accumulation. Their mass balance is becoming increasingly negative, and therefore they account for an even larger fraction of current WAIS discharge. If all of the ice in these sectors of the WAIS were discharged to the ocean, global sea level would rise by ca2m. There is compelling evidence that grounding lines of palaeo-ice streams were at, or close to, the continental shelf edge along the Amundsen Sea and Bellingshausen Sea margins during the last glacial period. However, the few cosmogenic surface exposure ages and ice core data available from the interior of West Antarctica indicate that ice surface elevations there have changed little since the LGM. In the few areas from which cosmogenic surface exposure ages have been determined near the margin of the ice sheet, they generally suggest that there has been a gradual decrease in ice surface elevation since pre-Holocene times. Radiocarbon dates from glacimarine and the earliest seasonally open marine sediments in continental shelf cores that have been interpreted as providing approximate ages for post-LGM grounding-line retreat indicate different trajectories of palaeo-ice stream recession in the Amundsen Sea and Bellingshausen Sea embayments. The areas were probably subject to similar oceanic, atmospheric and eustatic forcing, in which case the differences are probably largely a consequence of how topographic and geological factors have affected ice flow, and of topographic influences on snow accumulation and warm water inflow across the continental shelf. Pauses in ice retreat are recorded where there are "bottle necks" in cross-shelf troughs in both embayments. The highest retreat rates presently constrained by radiocarbon dates from sediment cores are found where the grounding line retreated across deep basins on the inner shelf in the Amundsen Sea, which is consistent with the marine ice sheet instability hypothesis. Deglacial ages from the Amundsen Sea Embayment (ASE) and Eltanin Bay (southern Bellingshausen Sea) indicate that the ice sheet had already retreated close to its modern limits by early Holocene time, which suggests that the rapid ice thinning, flow acceleration, and grounding line retreat observed in this sector over recent decades are unusual in the context of the past 10,000 years. © 2014 The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60179
Appears in Collections: 过去全球变化的重建
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作者单位: British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, United Kingdom; Department of Earth Sciences, Rice University, 6100 Main Street, Houston, TX 77005, United States; College of Life and Environmental Sciences, University of Exeter, Exeter EX4 4RJ, United Kingdom; Alfred Wegener Institute, Helmholtz-Centre for Polar and Marine Research, Am Alten Hafen 26, D-27568 Bremerhaven, Germany; Department of Geological Sciences, Stockholm University, 106 91 Stockholm, Sweden; Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, United States; Department of Geography, Durham University, South Road, Durham DH1 3LE, United Kingdom; Scott Polar Research Institute, University of Cambridge, Cambridge CB2 1ER, United Kingdom; Institute of Geophysics and Geology, University of Leipzig, Talstraße 35, D-04103 Leipzig, Germany; Department of Geosciences, University of Bremen, Bremen, Germany
Recommended Citation:
Larter R.D.,Anderson J.B.,Graham A.G.C.,et al. Reconstruction of changes in the Amundsen Sea and Bellingshausen Sea sector of the West Antarctic Ice Sheet since the Last Glacial Maximum[J]. Quaternary Science Reviews,2014-01-01,100