DOI: 10.5194/tc-14-2303-2020
论文题名: Repeated ice streaming on the northwest Greenland continental shelf since the onset of the Middle Pleistocene Transition
作者: Newton A.M.W. ; Huuse M. ; Knutz P.C. ; Cox D.R.
刊名: Cryosphere
ISSN: 19940416
出版年: 2020
卷: 14, 期: 7 起始页码: 2303
结束页码: 2312
语种: 英语
英文关键词: chronology
; continental shelf
; glacial-interglacial cycle
; ice flow
; ice sheet
; ice stream
; landform
; Pleistocene
; Arctic
; Greenland
; Greenland Ice Sheet
; Melville Bay
英文摘要: Ice streams provide a fundamental control on ice sheet discharge and depositional patterns along glaciated margins. This paper investigates ancient ice streams by presenting the first 3D seismic geomorphological analysis of a major glacigenic succession offshore Greenland. In Melville Bugt, northwest Greenland, six sets of landforms (five buried and one on the seafloor) have been interpreted as mega-scale glacial lineations (MSGLs) that provide evidence for extensive ice streams on outer palaeo-shelves. A gradual change in mean MSGL orientation and associated depocentres through time suggests that the palaeo-ice flow and sediment transport pathways migrated in response to the evolving submarine topography through each glacial-interglacial cycle. The stratigraphy and available chronology show that the MSGLs are confined to separate stratigraphic units and were most likely formed after the onset of the Middle Pleistocene Transition at 1:3 Ma. The MSGL record in Melville Bugt suggests that since 1:3 Ma, ice streams have regularly advanced across the continental shelf during glacial stages. High-resolution buried 3D landform records such as these have not been previously observed anywhere on the Greenland continental shelf margin and provide a crucial benchmark for testing how accurately numerical models are able to recreate past configurations of the Greenland Ice Sheet. © 2020 Copernicus GmbH. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164545
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: Department of Earth and Environmental Sciences, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom; School of Natural and Built Environment, Queen's University Belfast, University Road, Belfast, BT7 1NN, United Kingdom; Department of Geophysics, Geological Survey of Denmark and Greenland, Øster Voldgade 10, Copenhagen, 1350, Denmark
Recommended Citation:
Newton A.M.W.,Huuse M.,Knutz P.C.,et al. Repeated ice streaming on the northwest Greenland continental shelf since the onset of the Middle Pleistocene Transition[J]. Cryosphere,2020-01-01,14(7)