DOI: 10.1016/j.quascirev.2015.12.023
Scopus记录号: 2-s2.0-84954271021
论文题名: An East Siberian ice shelf during the Late Pleistocene glaciations: Numerical reconstructions
作者: Colleoni F. ; Kirchner N. ; Niessen F. ; Quiquet A. ; Liakka J.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 147 起始页码: 148
结束页码: 163
语种: 英语
英文关键词: Arctic ocean
; East Siberian ice shelf
; Glacial climate
; Ice sheet model
; Late Pleistocene glaciations
Scopus关键词: Climate models
; Dynamics
; Glacial geology
; Glaciers
; Snow
; Arctic ocean
; Glacial climate
; Ice sheet models
; Ice shelves
; Late Pleistocene glaciations
; Ice
英文摘要: A recent data campaign in the East Siberian Sea has revealed evidence of grounded and floating ice dynamics in regions of up to 1000 m water depth, and which are attributed to glaciations older than the Last Glacial Maximum (21 kyrs BP). The main hypothesis based on this evidence is that a small ice cap developed over Beringia and expanded over the East Siberian continental margin during some of the Late Pleistocene glaciations. Other similar evidence of ice dynamics that have been previously collected on the shallow continental shelves of the Arctic Ocean have been attributed to the penultimate glaciation, i.e. Marine Isotopes Stage 6 (≈140 kyrs BP). We use an ice sheet model, forced by two previously simulated MIS 6 glacial maximum climates, to carry out a series of sensitivity experiments testing the impact of dynamics and mass-balance related parameters on the geometry of the East Siberian ice cap and ice shelf. Results show that the ice cap developing over Beringia connects to the Eurasian ice sheet in all simulations and that its volume ranges between 6 and 14 m SLE, depending on the climate forcing. This ice cap generates an ice shelf of dimensions comparable with or larger than the present-day Ross ice shelf in West Antarctica. Although the ice shelf extent strongly depends on the ice flux through the grounding line, it is particularly sensitive to the choice of the calving and basal melting parameters. Finally, inhibiting a merging of the Beringia ice cap with the Eurasian ice sheet affects the expansion of the ice shelf only in the simulations where the ice cap fluxes are not large enough to compensate for the fluxes coming from the Eurasian ice sheet. © 2016 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59498
Appears in Collections: 过去全球变化的重建
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作者单位: Centro Euro-Mediterraneo sui Cambiamenti Climatici, Bologna, Italy; Department of Physical Geography, Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden; Biodiversity and Climate Research Centre, Frankfurt am Main, Germany; Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
Recommended Citation:
Colleoni F.,Kirchner N.,Niessen F.,et al. An East Siberian ice shelf during the Late Pleistocene glaciations: Numerical reconstructions[J]. Quaternary Science Reviews,2016-01-01,147