globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2014.06.023
Scopus记录号: 2-s2.0-84907594740
论文题名:
Reconstruction of ice-sheet changes in the Antarctic Peninsula since the Last Glacial Maximum
作者: Ocofaigh C.Ó; Davies B.J.; Livingstone S.J.; Smith J.A.; Johnson J.S.; Hocking E.P.; Hodgson D.A.; Anderson J.B.; Bentley M.J.; Canals M.; Domack E.; Dowdeswell J.A.; Evans J.; Glasser N.F.; Hillenbrand C.-D.; Larter R.D.; Roberts S.J.; Simms A.R.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 100
起始页码: 87
结束页码: 110
语种: 英语
英文关键词: Antarctic Peninsula Ice Sheet ; Antarctica ; Deglaciation ; Glacial geology ; Last Glacial Maximum
Scopus关键词: Glacial geology ; Glaciers ; Ice control ; Isotopes ; Radio systems ; Antarctic Peninsula Ice Sheet ; Antarctica ; Deglaciations ; Glacimarine sediment ; Grounding-zone wedges ; Last Glacial Maximum ; Terrestrial cosmogenic nuclides ; Western Antarctic Peninsula ; Ice ; cosmogenic radionuclide ; deglaciation ; glacial landform ; grounding line ; Holocene ; ice retreat ; ice sheet ; Last Glacial Maximum ; radiocarbon dating ; reconstruction ; shelf break ; topographic effect ; trough ; Antarctic Ice Sheet ; Antarctic Peninsula ; Antarctica ; Bransfield Basin ; Southern Ocean ; West Antarctica
英文摘要: This paper compiles and reviews marine and terrestrial data constraining the dimensions and configuration of the Antarctic Peninsula Ice Sheet (APIS) from the Last Glacial Maximum (LGM) through deglaciation to the present day. These data are used to reconstruct grounding-line retreat in 5ka time-steps from 25kaBP to present. Glacial landforms and subglacial tills on the eastern and western Antarctic Peninsula (AP) shelf indicate that the APIS was grounded to the outer shelf/shelf edge at the LGM and contained a series of fast-flowing ice streams that drained along cross-shelf bathymetric troughs. The ice sheet was grounded at the shelf edge until ~20calkaBP. Chronological control on retreat is provided by radiocarbon dates on glacimarine sediments from the shelf troughs and on lacustrine and terrestrial organic remains, as well as cosmogenic nuclide dates on erratics and ice moulded bedrock. Retreat in the east was underway by about 18calkaBP. The earliest dates on recession in the west are from Bransfield Basin where recession was underway by 17.5calkaBP. Ice streams were active during deglaciation at least until the ice sheet had pulled back to the mid-shelf. The timing of initial retreat decreased progressively southwards along the western AP shelf; the large ice stream in Marguerite Trough may have remained grounded at the shelf edge until about 14calkaBP, although terrestrial cosmogenic nuclide ages indicate that thinning had commenced by 18kaBP. Between 15 and 10calkaBP the APIS underwent significant recession along the western AP margin, although retreat between individual troughs was asynchronous. Ice in Marguerite Trough may have still been grounded on the mid-shelf at 10calkaBP. In the Larsen-A region the transition from grounded to floating ice was established by 10.7-10.6calkaBP. The APIS had retreated towards its present configuration in the western AP by the mid-Holocene but on the eastern peninsula may have approached its present configuration several thousand years earlier, by the start of the Holocene. Mid to late-Holocene retreat was diachronous with stillstands, re-advances and changes in ice-shelf configuration being recorded in most places. Subglacial topography exerted a major control on grounding-line retreat with grounding-zone wedges, and thus by inference slow-downs or stillstands in the retreat of the grounding line, occurring in some cases on reverse bed slopes. © 2014 The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60177
Appears in Collections:过去全球变化的重建

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作者单位: Department of Geography, Durham University, Durham, DH1 3LE, United Kingdom; Centre for Glaciology, Department of Geography and Earth Sciences, Aberystwyth University, Aberystwyth, SY23 3DB, Wales, United Kingdom; Department of Geography, University of Sheffield, Sheffield, S10 2TN, United Kingdom; British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, United Kingdom; Department of Geography, Northumbria University, Newcastle upon Tyne, NE1 8ST, United Kingdom; Department of Earth Sciences, Rice University, 6100 Main Street, Houston, TX, United States; CRG Marine Geosciences, Department of Stratigraphy, Paleontology and Marine Geosciences, Faculty of Geology, University Barcelona, Campus de Pedralbes, C/Marti i Franques s/n, 08028, Barcelona, Spain; College of Marine Science, University of South Florida, 140 7th Avenue South, St. Petersburg, FL 33701-5016, United States; Scott Polar Research Institute, University of Cambridge, Cambridge, CB2 1ER, United Kingdom; Department of Geography, University of Loughborough, Loughborough, LE11 3TU, United Kingdom; Department of Earth Science, University of California Santa Barbara, 1006 Webb Hall, Santa Barbara, CA 93106, United States; Centre for Quaternary Research, Department of Geography, University of London, Royal Holloway, Surrey, TW20 0EX, United Kingdom

Recommended Citation:
Ocofaigh C.Ó,Davies B.J.,Livingstone S.J.,et al. Reconstruction of ice-sheet changes in the Antarctic Peninsula since the Last Glacial Maximum[J]. Quaternary Science Reviews,2014-01-01,100
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