DOI: 10.1016/j.quascirev.2013.01.024
Scopus记录号: 2-s2.0-84874522371
论文题名: Collapse of marine-based outlet glaciers from the Scandinavian Ice Sheet
作者: Mangerud J. ; Goehring B.M. ; Lohne T.S. ; Svendsen J.I. ; Gyllencreutz R.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 67 起始页码: 8
结束页码: 16
语种: 英语
英文关键词: 10Be exposure ages
; Calving rates
; Fjords
; Hardangerfjorden
; Ice-margin retreat rates
; Jakobshavn Isbrae
; Last Glacial Maximum
; Marine ice margin
; Shorelines
; Sognefjorden
; Younger Dryas
Scopus关键词: Calving rates
; Exposure age
; Fjords
; Hardangerfjorden
; Ice-margin retreat rates
; Jakobshavn Isbrae
; Last Glacial Maximum
; Marine ice margin
; Shorelines
; Sognefjorden
; Younger Dryas
; Glacial geology
; Glaciers
; Ice
; beryllium isotope
; carbon isotope
; chronology
; collapse
; glacial environment
; ice margin
; ice sheet
; moraine
; numerical model
; radiocarbon dating
; reconstruction
; shoreline
; water depth
; Atlantic Ocean
; North Sea
; Norwegian Channel
; Scandinavia
英文摘要: We present a reconstruction of the timing and retreat rates of more than 2000 m thick Younger Dryas (YD) fjord glaciers in western Norway using a detailed chronology of 10Be exposure ages from lateral moraines and 14C dated end moraines. A primary conclusion is that ice margins retreated up the 120-170 km long fjords at mean rates of 240-340 m yr-1 during the early Holocene. We further show that part of the south-western sector of the Scandinavian Ice Sheet collapsed in two distinct steps. The first step occurred between 19.5 and 18.5 ka BP as break up of the Norwegian Channel Ice Stream, which drained the ice sheet during the Last Glacial Maximum (LGM). The second step was the rapid retreat up the fjords mentioned above, dated to 11.6-11.1 ka BP. During the intervening ~7000 years no net retreat occurred despite oscillations of the ice margin. This stepwise ice margin retreat strongly contrasts with the more monotonic decay of the ice sheet as a whole, indicating that water depths set the pace for climate-triggered ice margin retreat in this part of the ice sheet. Calving and melting of marine margins has dominated mass-loss from modern ice sheets in recent decades; however, the mechanisms and long-term (100-1000 yr) rate of ice-front retreat is less certain and empirical examples such as those given here may help in developing better numerical models. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60668
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, 5007 Bergen, Norway; Bjerknes Centre for Climate Research, University of Bergen, Norway; Dept. of Earth and Environmental Sciences, Lamont Doherty Earth Observatory, Columbia Univ., Palisades, NY, United States; Department of Earth and Atmospheric Sciences, Purdue University, 550 Stadium Mall Dr., West Lafayette, IN 47907, United States; Department of Geological Sciences, Stockholm University, SE-10691 Stockholm, Sweden
Recommended Citation:
Mangerud J.,Goehring B.M.,Lohne T.S.,et al. Collapse of marine-based outlet glaciers from the Scandinavian Ice Sheet[J]. Quaternary Science Reviews,2013-01-01,67