DOI: 10.5194/tc-10-639-2016
Scopus记录号: 2-s2.0-84962608572
论文题名: Numerical simulations of the Cordilleran ice sheet through the last glacial cycle
作者: Seguinot J ; , Rogozhina I ; , Stroeven A ; P ; , Margold M ; , Kleman J
刊名: Cryosphere
ISSN: 19940416
出版年: 2016
卷: 10, 期: 2 起始页码: 639
结束页码: 664
语种: 英语
英文关键词: climate forcing
; Cordilleran Ice Sheet
; glaciation
; glacier dynamics
; Holocene
; Last Glacial
; Last Glacial Maximum
; nucleation
; numerical model
; oxygen isotope
; spatial variation
; Antarctica
; Arctic
; Greenland
; North America
英文摘要: After more than a century of geological research, the Cordilleran ice sheet of North America remains among the least understood in terms of its former extent, volume, and dynamics. Because of the mountainous topography on which the ice sheet formed, geological studies have often had only local or regional relevance and shown such a complexity that ice-sheet-wide spatial reconstructions of advance and retreat patterns are lacking. Here we use a numerical ice sheet model calibrated against field-based evidence to attempt a quantitative reconstruction of the Cordilleran ice sheet history through the last glacial cycle. A series of simulations is driven by time-dependent temperature offsets from six proxy records located around the globe. Although this approach reveals large variations in model response to evolving climate forcing, all simulations produce two major glaciations during marine oxygen isotope stages 4 (62.2-56.9 ka) and 2 (23.2-16.9 ka). The timing of glaciation is better reproduced using temperature reconstructions from Greenland and Antarctic ice cores than from regional oceanic sediment cores. During most of the last glacial cycle, the modelled ice cover is discontinuous and restricted to high mountain areas. However, widespread precipitation over the Skeena Mountains favours the persistence of a central ice dome throughout the glacial cycle. It acts as a nucleation centre before the Last Glacial Maximum and hosts the last remains of Cordilleran ice until the middle Holocene (6.7 ka). © 2016 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75167
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Laboratory of Hydraulics, Hydrology and Glaciology, ETH Zürich, Zürich, Switzerland; Department of Physical Geography, Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden; Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Potsdam, Germany; Center for Marine Environmental Sciences, University of Bremen, Bremen, Germany
Recommended Citation:
Seguinot J,, Rogozhina I,, Stroeven A,et al. Numerical simulations of the Cordilleran ice sheet through the last glacial cycle[J]. Cryosphere,2016-01-01,10(2)