DOI: 10.1016/j.quascirev.2014.05.016
Scopus记录号: 2-s2.0-84902677145
论文题名: Slow retreat of a land based sector of the West Greenland Ice Sheet during the Holocene Thermal Maximum: EVIDENCE from threshold lakes at Paakitsoq
作者: Håkansson L. ; Briner J.P. ; Andresen C.S. ; Thomas E.K. ; Bennike O.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 98 起始页码: 74
结束页码: 83
语种: 英语
英文关键词: Greenland ice sheet
; Holocene thermal maximum
; Little ice age
; Neoglaciation
; Paleoclimate
Scopus关键词: Climate change
; Glaciers
; Lakes
; Greenland Ice Sheet
; Holocene thermal maximums
; Little Ice Age
; Neoglaciation
; Paleoclimates
; Ice
; climate variation
; Holocene
; ice margin
; ice retreat
; lacustrine deposit
; paleoclimate
; proxy climate record
; Arctic
; Greenland
; Greenland Ice Sheet
; Paakitsoq
英文摘要: Records from two connected proglacial threshold lakes at Paakitsoq, west Greenland have been analyzed in order to investigate the response of a land-based ice sheet margin to Holocene climate change. The results are used to test whether or not the land terminating margin at Paakitsoq behaved synchronously with the nearby marine terminating Jakobshavn Isbræ during the Holocene. The radiocarbon dated lake sediment cores indicate that the ice margin retreated to its present position ~6.5ka ago and thereafter maintained a relatively stable configuration similar to the present for >1000 years, despite summer temperatures >2°C higher than today. The lakes became non-glacial after 5.4cal.kaBP, when the ice margin retreated behind a drainage divide situated ~1.5km inland of the present margin. By this time, Jakobshavn Isbræ had already reached its minimum configuration. The Paakitsoq ice margin remained >1.5km inland of its present margin until after 240±20cal.yrBP; after this time, both Paakitsoq ice margin and Jakobshavn Isbræ reached their Holocene maxima during the later stage of the Little Ice Age. Our results suggest that the present ice margin position at Paakitsoq is relatively stable in a warming climate but after a total retreat of ~1.5km behind the present margin position it may become marine based and more unstable due to marine melting and calving processes. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60210
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Marine Geology and Glaciology, Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark; Department of Geology and Mineral Resources Engineering, Norwegian University of Science and Technology, Sem Særlands Veg 1, N-7491 Trondheim, Norway; Department of Geology, University at Buffalo, Buffalo, NY 14260, United States; Department of Geological Sciences, Brown University, Providence, RI 02912, United States
Recommended Citation:
Håkansson L.,Briner J.P.,Andresen C.S.,et al. Slow retreat of a land based sector of the West Greenland Ice Sheet during the Holocene Thermal Maximum: EVIDENCE from threshold lakes at Paakitsoq[J]. Quaternary Science Reviews,2014-01-01,98