DOI: 10.1016/j.quascirev.2018.06.014
Scopus记录号: 2-s2.0-85051626905
论文题名: Holocene mountain glacier history in the Sukkertoppen Iskappe area, southwest Greenland
作者: Schweinsberg A.D. ; Briner J.P. ; Miller G.H. ; Lifton N.A. ; Bennike O. ; Graham B.L.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 197 起始页码: 142
结束页码: 161
语种: 英语
英文关键词: Cosmogenic in situ 14C
; Glacier fluctuations
; Greenland
; Holocene
; Lake sediment
; Neoglaciation
Scopus关键词: Expansion
; Glaciers
; Intercalation
; Lakes
; Sediments
; Volcanoes
; Cosmogenic
; Glacier fluctuations
; Greenland
; Holocenes
; Lake sediments
; Neoglaciation
; Ice
; carbon isotope
; expansion
; glacial history
; glacial lake
; glacier advance
; glacier dynamics
; Holocene
; ice cap
; in situ measurement
; lacustrine deposit
; moss
; mountain region
; Neoglacial
; proglacial environment
; Arctic
; Greenland
; Greenland Ice Sheet
; Bryophyta
英文摘要: Mountain glaciers and ice caps (GIC) independent of the Greenland Ice Sheet respond rapidly to climate variations and records of their past extent provide information on the natural envelope of climate variability. Here, we use a multi-proxy approach that combines proglacial lake sediment analysis, cosmogenic nuclide surface-exposure dating (in situ 10Be and 14C), and radiocarbon dating of recently ice-entombed moss to generate a centennial-scale record of Holocene GIC fluctuations in southwestern Greenland. Following local deglaciation ∼10-9 ka, sediments from proglacial Crash Lake record a glacier advance at ∼9 ka that is indistinguishable from nearby ice sheet moraines, implying a synchronous response of GIC and the Greenland Ice Sheet to a centennial-scale climate event. Following this local glacier advance, GIC experienced net recession until ∼4.6 ka. Radiocarbon ages of in situ moss (n = 29) and Crash Lake sediments reveal intervals of glacier expansion at ∼1.8, 1.2 and 0.7 ka that are superimposed on an overall trend of net glacier expansion throughout the late Holocene. In situ 14C concentrations from bedrock adjacent to radiocarbon-dated moss samples further constrain the duration of ice cover through the Holocene in this region. We find that our glacier-size proxy records during the past ∼4 ka are broadly consistent with relatively lower temperatures recorded in GISP2 and occur during, or following, intervals of volcanic perturbations. Thus, we speculate that volcanic activity, although less frequent and intense than in the early Holocene and during the Little Ice Age, may have led to centennial-scale variability imprinted on net glacier expansion due to decreasing summer insolation through the late Holocene. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112070
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geology, University at Buffalo, Buffalo, NY 14260, United States; Department of Geological Sciences, University of Colorado, Boulder, CO 80309, United States; Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, IN 47906, United States; Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47906, United States; Geological Survey of Denmark and Greenland, Øster Voldgade 10, Copenhagen k, DK-1350, Denmark
Recommended Citation:
Schweinsberg A.D.,Briner J.P.,Miller G.H.,et al. Holocene mountain glacier history in the Sukkertoppen Iskappe area, southwest Greenland[J]. Quaternary Science Reviews,2018-01-01,197