气候变化领域集成服务门户(CCPortal): Ice surface lowering of Skelton Glacier; Transantarctic Mountains; since the Last Glacial Maximum: Implications for retreat of grounded ice in the western Ross Sea

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DOI	10.1016/j.quascirev.2020.106305
	Ice surface lowering of Skelton Glacier; Transantarctic Mountains; since the Last Glacial Maximum: Implications for retreat of grounded ice in the western Ross Sea
	Anderson J.T.H.; Wilson G.S.; Jones R.S.; Fink D.; Fujioka T.
发表日期	2020
ISSN	0277-3791
卷号	237
英文摘要	Quantifying the contribution of the East Antarctic Ice Sheet (EAIS) to sea-level rise during the last deglaciation is complicated by the limited opportunities to constrain ice-sheet models. The nunatak, Escalade Peak, provides a gauge for past ice surface elevation changes and behaviour throughout the last glacial cycle. Geomorphological mapping, geological evidence and 10Be cosmogenic-nuclide exposure dating at Escalade Peak, provide new constraints on the ice surface history of the Skelton Névé since the Last Glacial Maximum (LGM). An elevation transect from the eastern margin of Escalade Peak indicates that the ice surface of the Skelton Névé was at least 50 m and perhaps >120 m higher than present during the LGM. In contrast, surface-exposure ages from a suite of inner moraines (blue-ice moraines) adjacent to Escalade Peak do not provide independent ice surface elevation constraints, but may provide an indirect constraint on the timing of thinning due to exhumation-ablation processes. Maximum simple exposure ages from the inner moraines suggest ice surface ablation was initiated by 19.2 ka, but the majority of ice surface lowering at Escalade Peak likely occurred after ∼15 ka and reached the present-day ice level at ∼6 ka. These findings suggest that slow flowing inland sites of EAIS outlet glaciers, such as southern Skelton Névé, experienced minimal ice surface elevation change since the LGM and record an EAIS outlet glacier and western Ross Sea retreat signature rather than widespread Ross Sea retreat. The ice surface lowering is likely to have been in response to retreat of the grounded ice in the western Ross Embayment causing a reduction in buttressing of the Skelton Glacier and draw down into the Ross Sea. © 2020 Elsevier Ltd
英文关键词	Cosmogenic isotopes; East Antarctic Ice Sheet; Holocene; Last Glacial Maximum; Ross Sea
语种	英语
scopus关键词	Ablation; Glacial geology; Glaciers; Sea level; Cosmogenic nuclides; East antarctic ice sheets; Geomorphological mapping; Ice surface elevation; Last deglaciation; Last glacial cycles; Last Glacial Maximum; Surface exposure age; Ice; ablation; deglaciation; exhumation; ice retreat; last deglaciation; Last Glacial Maximum; transect; Antarctic Ice Sheet; Antarctica; East Antarctic Ice Sheet; East Antarctica; Ross Embayment; Ross Sea; Southern Ocean; Transantarctic Mountains; West Antarctica
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151477
作者单位	Department of Geology, Department of Marine Science, University of Otago, PO Box 56, Dunedin, New Zealand; GNS Science, PO Box 30368, Lower Hutt, Wellington, 5040, New Zealand; School of Earth, Atmosphere and Environment, Monash University, Wellington Rd, Clayton, VIC 3800, Australia; Australian Nuclear Science & Technology Organisation, New Illawarra Road, Lucas Heights, NSW 2234, Australia
推荐引用方式 GB/T 7714	Anderson J.T.H.,Wilson G.S.,Jones R.S.,et al. Ice surface lowering of Skelton Glacier; Transantarctic Mountains; since the Last Glacial Maximum: Implications for retreat of grounded ice in the western Ross Sea[J],2020,237.
APA	Anderson J.T.H.,Wilson G.S.,Jones R.S.,Fink D.,&Fujioka T..(2020).Ice surface lowering of Skelton Glacier; Transantarctic Mountains; since the Last Glacial Maximum: Implications for retreat of grounded ice in the western Ross Sea.Quaternary Science Reviews,237.
MLA	Anderson J.T.H.,et al."Ice surface lowering of Skelton Glacier; Transantarctic Mountains; since the Last Glacial Maximum: Implications for retreat of grounded ice in the western Ross Sea".Quaternary Science Reviews 237(2020).