DOI: 10.1016/j.quascirev.2012.09.028
Scopus记录号: 2-s2.0-84870656444
论文题名: Age of the Fjord Stade moraines in the Disko Bugt region, western Greenland, and the 9.3 and 8.2 ka cooling events
作者: Young N.E. ; Briner J.P. ; Rood D.H. ; Finkel R.C. ; Corbett L.B. ; Bierman P.R.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 60 起始页码: 76
结束页码: 90
语种: 英语
英文关键词: 10Be exposure dating
; Abrupt climate change
; Greenland Ice Sheet
; Moraines
Scopus关键词: <sup>10</sup>Be exposure dating
; Abrupt climate change
; Deglaciations
; Greenland
; Greenland Ice Sheet
; Holocenes
; Ice core
; Ice sheet
; Moraines
; Site-specific
; Study sites
; Temperature variation
; Deposits
; Glaciers
; Ice
; age determination
; beryllium isotope
; carbon isotope
; climate variation
; cooling
; deglaciation
; fjord
; geochronology
; geomorphology
; glacier retreat
; GRIP
; Holocene
; ice flow
; ice margin
; ice sheet
; moraine
; paleoclimate
; paleotemperature
; perturbation
; warming
; Arctic
; Disko Bay
; Greenland
; Greenland Ice Sheet
; Jakobshavn Glacier
英文摘要: Retreat of the western Greenland Ice Sheet during the early Holocene was interrupted by deposition of the Fjord Stade moraine system. The Fjord Stade moraine system spans several hundred kilometers of western Greenland's ice-free fringe and represents an important period in the western Greenland Ice Sheet's deglaciation history, but the origin and timing of moraine deposition remain uncertain. Here, we combine new and previously published 10Be and 14C ages from Disko Bugt, western Greenland to constrain the timing of Fjord Stade moraine deposition at two locations ∼60 km apart. At Jakobshavn Isfjord, the northern of two study sites, we show that Jakobshavn Isbræ advanced to deposit moraines ca 9.2 and 8.2-8.0 ka. In southeastern Disko Bugt, the ice sheet deposited moraines ca 9.4-9.0 and 8.5-8.1 ka. Our ice-margin chronology indicates that the Greenland Ice Sheet in two distant regions responded in unison to early Holocene abrupt cooling 9.3 and 8.2 ka, as recorded in central Greenland ice cores. Although the timing of Fjord Stade moraine deposition was synchronous in Jakobshavn Isfjord and southeastern Disko Bugt, within uncertainties, we suggest that Jakobshavn Isbræ advanced while the southeastern Disko Bugt ice margin experienced stillstands during the 9.3 and 8.2 ka events based on regional geomorphology and the distribution of 10Be ages at each location. The contrasting style of ice-margin response was likely regulated by site-specific ice-flow characteristics. Jakobshavn Isbræ's high ice flux results in an amplified ice-margin response to a climate perturbation, both warming and cooling, whereas the comparatively low-flux sector of the ice sheet in southeastern Disko Bugt experiences a more subdued response to climate perturbations. Our chronology indicates that the western Greenland Ice Sheet advanced and retreated in concert with early Holocene temperature variations, and the 9.3 and 8.2 ka events, although brief, were of sufficient duration to elicit a significant response of the western Greenland Ice Sheet. © 2012 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60737
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geology, University at Buffalo, Buffalo, NY 14260, United States; Scottish Universities Environmental Research Centre (SUREC), East Kilbride G75 0QF, United Kingdom; Earth Research Institute, University of California, Santa Barbara, CA 93106, United States; Department of Earth and Planetary Sciences, University of California-Berkeley, Berkeley, CA, United States; Department of Geology, University of Vermont, Burlington, VT 05405, United States; Department of Earth Sciences, Dartmouth College, Hanover, NH 03755, United States
Recommended Citation:
Young N.E.,Briner J.P.,Rood D.H.,et al. Age of the Fjord Stade moraines in the Disko Bugt region, western Greenland, and the 9.3 and 8.2 ka cooling events[J]. Quaternary Science Reviews,2013-01-01,60