DOI: 10.1016/j.quascirev.2013.05.027
Scopus记录号: 2-s2.0-84900416887
论文题名: Rapid early Holocene ice retreat in West Greenland
作者: Larsen N.K. ; Funder S. ; Kjær K.H. ; Kjeldsen K.K. ; Knudsen M.F. ; Linge H.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 92 起始页码: 310
结束页码: 323
语种: 英语
英文关键词: Cosmogenic surface exposure dating
; Early Holocene
; Greenland ice sheet
; Ice retreat
Scopus关键词: Glacial geology
; Sea ice
; Sea level
; Early Holocene
; Glacial erosion
; Global sea levels
; Greenland Ice Sheet
; Last Glacial Maximum
; Radiocarbon age
; Surface exposure dating
; Topographic control
; Glaciers
; beryllium isotope
; climate variation
; cosmogenic radionuclide
; dating method
; deglaciation
; fjord
; glacial erosion
; GRIP
; Holocene
; ice margin
; ice retreat
; ice sheet
; topographic effect
; topographic mapping
; warming
; Arctic
; Buksefjord
; Godthabsfjord
; Greenland
; Greenland Ice Sheet
; Sermilik
; West Greenland
英文摘要: The possible demise of the Greenland ice sheet and its effect on global sea level rank among the most serious climate threats to society. To improve our knowledge about the future behaviour of the ice margin, we studied the ice sheet's response to early Holocene warming in West Greenland using 47 cosmogenic 10Be exposure ages, 26 optically-stimulated luminescence ages as well as 15 new and 28 previously published radiocarbon ages. Paired bedrock and boulder ages show that the entire area was covered by warm-based ice during the Last Glacial Maximum (LGM), although glacial erosion was insufficient to completely remove the upper rock surface containing 10Be inherited from a previous period of exposure in bedrock samples above an elevation of 800m. Our compilation of 10Be and 14C ages demonstrates that the ice sheet retreated from the outer-coast to the present ice margin between c. 11.4 and 10.4cal.kaBP in the Godthåbsfjord system and between 10.7±0.6 and 10.1±0.4ka ago in Buksefjord, whereas the coast at Sermilik became ice free at c. 10.5cal.kaBP. We find no significant changes in the retreat rates between the deep Godthåbsfjord system and the Buksefjord-Sermilik region, which is characterized by only a few narrow and shallow fjords. However, deglaciation was initiated c. 700-900 years earlier in the Godthåbsfjord system indicating that the deep fjords probably triggered land-based deglaciation by dynamic ice loss leading to an overall rapid early Holocene ice retreat and drawdown of the ice sheet in West Greenland. These results demonstrate that even if there was a topographic control on the onset of deglaciation, fast ice retreat is not restricted to deep fjord systems but may occur independently of the topographic setting. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60304
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, 8000 Aarhus C, Denmark; Centre for GeoGenetics, Natural History Museum of Denmark, University of Copenhagen, Øster Voldgade 5-7, 1350 Copenhagen K, Denmark; Department of Earth Science, University of Bergen, Allégaten 41, NO-5007 Bergen, Norway
Recommended Citation:
Larsen N.K.,Funder S.,Kjær K.H.,et al. Rapid early Holocene ice retreat in West Greenland[J]. Quaternary Science Reviews,2014-01-01,92