DOI: 10.1016/j.quascirev.2017.01.018
论文题名: The last glaciation and deglaciation of the Northeast Greenland continental shelf revealed by hydro-acoustic data
作者: Arndt J.E. ; Jokat W. ; Dorschel B.
刊名: Quaternary Science Reviews
出版年: 2017
卷: 160 起始页码: 45
结束页码: 56
语种: 英语
英文关键词: Arctic
; Ice flow
; Ice retreat
; LGM ice extent
; Northeast Greenland ice stream
; Submarine glacial landforms
; Swath bathymetry
Scopus关键词: Domes
; Glacial geology
; Glaciers
; Sea ice
; Sea level
; Arctic
; Glacial landforms
; Ice flow
; Ice streams
; LGM ice extent
; Swath bathymetry
; Ice
; acoustic data
; continental shelf
; deglaciation
; glacial landform
; grounding line
; ice flow
; ice retreat
; ice sheet
; ice shelf
; ice stream
; Last Glacial Maximum
; shelf break
; swath bathymetry
; Younger Dryas
; Arctic
; Greenland
; Greenland Ice Sheet
英文摘要: About 16% of the Greenland Ice Sheet drains in the area of the Northeast Greenland shelf between 76°N and 80.5°N via marine terminating glaciers. Most of it is via the Northeast Greenland Ice Stream, the largest ice stream of Greenland. During ice ages, the ice sheet extended onto the continental shelf and modern-day cross-shelf troughs were filled by ice streams. In this study, high-resolution hydro-acoustic data acquired during three decades of research were jointly investigated to reveal the past glacial conditions. Our data shows that Westwind Trough and Norske Trough were filled by fast flowing ice streams that extended to the shelf edge during the last glacial maximum. In between the cross-shelf troughs, ice domes resided on shallow banks that may have contributed about a decimetre to global sea level. Most probably these ice domes initiated fast ice flow through sinks in the inter-trough area. In Westwind Trough, ice sheet retreat to the inner shelf after the last glacial maximum was intermittent. In contrast, in Norske Trough the ice sheet retreat appears relatively rapid with no evidences for phases of grounding line stabilization. Probably during the Younger Dryas, the ice sheet readvanced to a mid-shelf position in both troughs documented by grounding zone wedges. During this time, a thick ice shelf was present in Norske Trough releasing tabular icebergs. Ice sheet retreat from the mid-shelf to the coastline during Holocene deglaciation was rapid. © 2017 Elsevier Ltd 资助项目: Arndt, J.E.Am Handelshafen 12, Germany
; 电子邮件: Jan.Erik.Arndt@awi.de
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59296
Appears in Collections: 过去全球变化的重建
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作者单位: Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
Recommended Citation:
Arndt J.E.,Jokat W.,Dorschel B.. The last glaciation and deglaciation of the Northeast Greenland continental shelf revealed by hydro-acoustic data[J]. Quaternary Science Reviews,2017-01-01,160