DOI: 10.1016/j.quascirev.2015.11.013
Scopus记录号: 2-s2.0-84949637542
论文题名: A major re-growth of the Scandinavian Ice Sheet in western Norway during Allerød-Younger Dryas
作者: Mangerud J. ; Aarseth I. ; Hughes A.L.C. ; Lohne Ø.S. ; Skår K. ; Sønstegaard E. ; Svendsen J.I.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 132 起始页码: 175
结束页码: 205
语种: 英语
英文关键词: Allerød
; Bølling
; Older Dryas
; The Fennoscandian Ice Sheet
; The Norwegian Channel Ice Stream
; The Scandinavian Ice Sheet
; Younger Dryas
Scopus关键词: Glacial geology
; Glaciers
; Glacial erosion
; Glacial re-advance
; Ice sheet
; Ice streams
; Last Glacial Maximum
; Older Dryas
; Radiocarbon dates
; Younger Dryas
; Ice
英文摘要: Distinct Younger Dryas (YD) moraines are mapped more-or-less continuously around the Scandinavian Ice Sheet. In most areas there is no evidence to suggest that a glacial re-advance took place during the YD, either because it did not happen or because older deposits have been removed by glacial erosion. In contrast we here present 90 radiocarbon dates from 36 different sites that were overrun by a major ice sheet advance in the area between Hardangerfjorden and Sognefjorden, SW Norway. Thus this region is exceptional for examining the glacial response to the climate shifts across Allerød-YD. The re-growth of the ice sheet in this sector commenced during the Allerød Interstadial. It expanded along 600-800 m deep fjords reaching a thickness of up to 2000 m. We produce time-distance diagrams for two lobes; for both the outermost coast became ice free close to 15 cal ka BP, i.e. at the onset of the Bølling. The Hardangerfjorden Lobe re-advanced during the Older Dryas (14 cal ka BP), an event that was not replicated for the Herdla Lobe farther north. Both lobes reached their most landward position before re-advancing at 13.5-13.0 cal ka and obtained their maximum extent at the very end of the YD, 11.5 cal ka. The late culmination of the advance is accurately dated and differs from most of the Scandinavian Ice Sheet margin where the maximum was reached during early or middle YD. We also present a time-distance diagram from the Last Glacial Maximum to the ice divide showing two-step retreat; fast retreat occurs 21-20 and 11.5-10 cal ka BP separated by a period of almost no net retreat 20-11.5 cal ka BP, which contrasts with much more even retreat in other parts of the Scandinavian Ice Sheet. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59708
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth Science, University of Bergen, Allegt. 41, PO Box 7803, Bergen, Norway; Bjerknes Centre for Climate Research, Bergen, Norway
Recommended Citation:
Mangerud J.,Aarseth I.,Hughes A.L.C.,et al. A major re-growth of the Scandinavian Ice Sheet in western Norway during Allerød-Younger Dryas[J]. Quaternary Science Reviews,2016-01-01,132