DOI: 10.5194/tc-14-2115-2020
论文题名: Past ice sheet-seabed interactions in the northeastern Weddell Sea embayment, Antarctica
作者: Erik Arndt J. ; Larter R.D. ; Hillenbrand C.-D. ; Sørli S.H. ; Forwick M. ; Smith J.A. ; Wacker L.
刊名: Cryosphere
ISSN: 19940416
出版年: 2020
卷: 14, 期: 6 起始页码: 2115
结束页码: 2135
语种: 英语
英文关键词: glacier retreat
; grounding line
; ice cover
; ice sheet
; ice shelf
; ice-ocean interaction
; Last Glacial Maximum
; seafloor
; Antarctic Ice Sheet
; Antarctica
; Brunt Ice Shelf
; East Antarctic Ice Sheet
; East Antarctica
; Southern Ocean
; Weddell Sea
英文摘要: The Antarctic ice sheet extent in the Weddell Sea embayment (WSE) during the Last Glacial Maximum (LGM; ca. 19-25 calibrated kiloyears before present, kacalBP) and its subsequent retreat from the shelf are poorly constrained, with two conflicting scenarios being discussed. Today, the modern Brunt Ice Shelf, the last remaining ice shelf in the northeastern WSE, is only pinned at a single location and recent crevasse development may lead to its rapid disintegration in the near future. We investigated the seafloor morphology on the northeastern WSE shelf and discuss its implications, in combination with marine geological records, to create reconstructions of the past behaviour of this sector of the East Antarctic Ice Sheet (EAIS), including ice-seafloor interactions. Our data show that an ice stream flowed through Stancomb-Wills Trough and acted as the main conduit for EAIS drainage during the LGM in this sector. Post-LGM ice stream retreat occurred stepwise, with at least three documented grounding-line still-stands, and the trough had become free of grounded ice by10.5kacalBP. In contrast, slow-flowing ice once covered the shelf in Brunt Basin and extended westwards toward McDonald Bank. During a later time period, only floating ice was present within Brunt Basin, but large "ice slabs"enclosed within the ice shelf occasionally ran aground at the eastern side of McDonald Bank, forming 10 unusual ramp-shaped seabed features. These ramps are the result of temporary ice shelf grounding events buttressing the ice further upstream. To the west of this area, Halley Trough very likely was free of grounded ice during the LGM, representing a potential refuge for benthic shelf fauna at this time.. © Author(s) 2020. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164452
Appears in Collections: 气候变化与战略
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作者单位: Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Am Handelshafen 12, Bremerhaven, 27570, Germany; British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, United Kingdom; Department of Geosciences, UiT the Arctic University of Norway, Postboks 6050 Langnes, Tromsø, 9037, Norway; Eth Zürich, Laboratory of Ion Beam Physics, Schafmattstrasse 20, Zurich, 8093, Switzerland
Recommended Citation:
Erik Arndt J.,Larter R.D.,Hillenbrand C.-D.,et al. Past ice sheet-seabed interactions in the northeastern Weddell Sea embayment, Antarctica[J]. Cryosphere,2020-01-01,14(6)