DOI: 10.1016/j.quascirev.2016.03.003
Scopus记录号: 2-s2.0-84960130641
论文题名: A model of the western Laurentide Ice Sheet, using observations of glacial isostatic adjustment
作者: Gowan E.J. ; Tregoning P. ; Purcell A. ; Montillet J.-P. ; McClusky S.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 139 起始页码: 1
结束页码: 16
语种: 英语
英文关键词: Glacial isostatic adjustment
; GPS
; Lake Agassiz
; Laurentide Ice Sheet
; Meltwater pulse 1A
; Sea level change
Scopus关键词: Climate models
; Gages
; Glacial geology
; Glaciers
; Global positioning system
; Lakes
; Sea level
; Shear stress
; Glacial Isostatic Adjustments
; Lake agassiz
; Laurentide ice sheets
; Meltwater pulse 1a
; Sealevel change
; Ice
; Glacial Lake Agassiz
; glacioisostasy
; GPS
; ice sheet
; ice thickness
; lacustrine environment
; lake level
; Laurentide Ice Sheet
; meltwater
; numerical model
; observational method
; paleoclimate
; paleotopography
; sea level change
; uplift
; Canada
; Great Slave Lake
; Northwest Territories
英文摘要: We present the results of a new numerical model of the late glacial western Laurentide Ice Sheet, constrained by observations of glacial isostatic adjustment (GIA), including relative sea level indicators, uplift rates from permanent GPS stations, contemporary differential lake level change, and postglacial tilt of glacial lake level indicators. The later two datasets have been underutilized in previous GIA based ice sheet reconstructions. The ice sheet model, called NAICE, is constructed using simple ice physics on the basis of changing margin location and basal shear stress conditions in order to produce ice volumes required to match GIA. The model matches the majority of the observations, while maintaining a relatively realistic ice sheet geometry. Our model has a peak volume at 18,000 yr BP, with a dome located just east of Great Slave Lake with peak thickness of 4000 m, and surface elevation of 3500 m. The modelled ice volume loss between 16,000 and 14,000 yr BP amounts to about 7.5 m of sea level equivalent, which is consistent with the hypothesis that a large portion of Meltwater Pulse 1A was sourced from this part of the ice sheet. The southern part of the ice sheet was thin and had a low elevation profile. This model provides an accurate representation of ice thickness and paleo-topography, and can be used to assess present day uplift and infer past climate. © 2016 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59621
Appears in Collections: 过去全球变化的重建
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作者单位: Research School of Earth Sciences, The Australian National UniversityACT, Australia; Department of Physical Geography, Stockholm University, Stockholm, Sweden; Bolin Centre for Climate Research, Stockholm, Sweden; School of Engineering (IMT-ESPLAB), Ecole Polytechnique Fédérale de Lausanne, Neuchâtel, Switzerland
Recommended Citation:
Gowan E.J.,Tregoning P.,Purcell A.,et al. A model of the western Laurentide Ice Sheet, using observations of glacial isostatic adjustment[J]. Quaternary Science Reviews,2016-01-01,139