DOI: 10.1016/j.quascirev.2015.10.036
论文题名: A Younger Dryas re-advance of local glaciers in north Greenland
作者: Larsen N.K. ; Funder S. ; Linge H. ; Möller P. ; Schomacker A. ; Fabel D. ; Xu S. ; Kjær K.H.
刊名: Quaternary Science Reviews
出版年: 2016
卷: 147 起始页码: 47
结束页码: 58
语种: 英语
英文关键词: Greenland ice sheet
; Ice marginal fluctuations
; Surface exposure dating
; Younger Dryas
Scopus关键词: Glacial geology
; Luminescence
; Oceanography
; Arctic ocean
; Atlantic meridional overturning circulations
; Greenland Ice Sheet
; North greenland
; Optically stimulated luminescence
; Surface exposure age
; Surface exposure dating
; Younger Dryas
; Ice
英文摘要: The Younger Dryas (YD) is a well-constrained cold event from 12,900 to 11,700 years ago but it remains unclear how the cooling and subsequent abrupt warming recorded in ice cores was translated into ice margin fluctuations in Greenland. Here we present 10Be surface exposure ages from three moraines in front of local glaciers on a 50 km stretch along the north coast of Greenland, facing the Arctic Ocean. Ten ages range from 11.6 ± 0.5 to 27.2 ± 0.9 ka with a mean age of 12.5 ± 0.7 ka after exclusion of two outliers. We consider this to be a minimum age for the abandonment of the moraines. The ages of the moraines are furthermore constrained using Optically Stimulated Luminescence (OSL) dating of epishelf sediments, which were deposited prior to the ice advance that formed the moraines, yielding a maximum age of 12.4 ± 0.6 ka, and bracketing the formation and subsequent abandonment of the moraines to within the interval 11.8–13.0 ka ago. This is the first time a synchronous YD glacier advance and subsequent retreat has been recorded for several independent glaciers in Greenland. In most other areas, there is no evidence for re-advance and glaciers were retreating during YD. We explain the different behaviour of the glaciers in northernmost Greenland as a function of their remoteness from the Atlantic Meridional Overturning Circulation (AMOC), which in other areas has been held responsible for modifying the YD drop in temperatures. © 2015 Elsevier Ltd 资助项目: Larsen, N.K.
; Department of Geoscience, Aarhus University, Høegh Guldbergs Gade 2, Denmark
; 电子邮件: nkl@geo.au.dk
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59517
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geoscience, Aarhus University, Høegh Guldbergs Gade 2, Aarhus C, Denmark; Centre for GeoGenetics, Natural History Museum of Denmark, University of Copenhagen, Øster Voldgade 5-7, Copenhagen K, Denmark; Department of Earth Science, University of Bergen, Bjerknes Centre for Climate Research, Postbox 7803, Bergen, Norway; Department of Geology, Lund University, Sweden; Department of Geology, UiT The Arctic University of Norway, Tromsø, Norway; AMS Laboratory, Scottish Universities Environmental Research Centre, East Kilbride, Scotland, United Kingdom
Recommended Citation:
Larsen N.K.,Funder S.,Linge H.,et al. A Younger Dryas re-advance of local glaciers in north Greenland[J]. Quaternary Science Reviews,2016-01-01,147