气候变化领域集成服务门户(CCPortal): Ice-flow patterns and precise timing of ice sheet retreat across a dissected fjord landscape in western Norway

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DOI	10.1016/j.quascirev.2019.04.032
	Ice-flow patterns and precise timing of ice sheet retreat across a dissected fjord landscape in western Norway
	Mangerud J.; Hughes A.L.C.; Sæle T.H.; Svendsen J.I.
发表日期	2019
ISSN	0277-3791
起始页码	139
结束页码	163
卷号	214
英文摘要	We reconstruct patterns of ice flow and retreat of the southwestern Scandinavian Ice Sheet, from 2900 field observations of glacial striae and elevation measurements of 60 ice-marginal-deltas from a high-resolution LiDAR DEM. During the Last Glacial Maximum, ice flow was towards the west across the entire area, including across several-hundred meter deep north-south oriented fjords. During deglaciation, ice flow adjusted to topography and the dominant flow direction switched towards the south-west. We use a shoreline diagram constructed from relative sea-level curves to establish the age of each delta, which allows us to constrain the timing of retreat with almost decadal precision. Rapid ice sheet retreat commenced at the onset of the Holocene at 11,600 cal years BP. Retreat rates were 160 m a−1 in the deepest fjords, 60–80 m a−1 in shallower fjords, and even slower for land-terminating margins. The fastest retreat rates, 240 m a−1 and 340 m a−1, were experienced in the largest fjords, Hardangerfjorden and Sognefjorden, which border the study area to the south and north. Crosscutting glacial striae indicate that calving bays developed during retreat along the widest fjords. The combination of complex fjord topography with fast ice-margin retreat by iceberg calving, led to isolation of ice remnants on islands and peninsulas, a process that accelerated the overall rate of deglaciation. Ice-margin retreat paused between 11,300–11,100 cal years BP, probably due to cooling during the Preboreal Oscillation. © 2019 Elsevier Ltd
英文关键词	Fennoscandian ice sheet; Glacial geomorphology; Glacial striae; Glacimarine terraces; Glaciology; Ice-berg calving; Ice-margin retreat rates; Scandinavia; Scandinavian ice sheet
语种	英语
scopus关键词	Glacial geology; Sea ice; Sea level; Timing circuits; Topography; Glacial geomorphology; Glacial striae; Glacimarine terraces; Glaciology; Ice sheet; Scandinavia; Glaciers; cooling; fjord; geomorphological response; glacial landform; glacier retreat; glaciology; ice flow; iceberg calving; landscape structure; Scandinavian Ice Sheet; Hardangerfjorden; Hordaland; Norway; Sogn og Fjordane; Sognefjorden
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/151917
作者单位	Department of Earth Science, University of Bergen, PO Box 7803, Bergen, 5020, Norway; Bjerknes Centre for Climate Research, Bergen, Norway; Department of Geography, School of Environment, Education and Development, The University of Manchester, Manchester, M13 9PL, United Kingdom
推荐引用方式 GB/T 7714	Mangerud J.,Hughes A.L.C.,Sæle T.H.,et al. Ice-flow patterns and precise timing of ice sheet retreat across a dissected fjord landscape in western Norway[J],2019,214.
APA	Mangerud J.,Hughes A.L.C.,Sæle T.H.,&Svendsen J.I..(2019).Ice-flow patterns and precise timing of ice sheet retreat across a dissected fjord landscape in western Norway.Quaternary Science Reviews,214.
MLA	Mangerud J.,et al."Ice-flow patterns and precise timing of ice sheet retreat across a dissected fjord landscape in western Norway".Quaternary Science Reviews 214(2019).