DOI: 10.1016/j.quascirev.2016.01.032
Scopus记录号: 2-s2.0-84989840768
论文题名: Shallow ice approximation, second order shallow ice approximation, and full Stokes models: A discussion of their roles in palaeo-ice sheet modelling and development
作者: Kirchner N. ; Ahlkrona J. ; Gowan E.J. ; Lötstedt P. ; Lea J.M. ; Noormets R. ; von Sydow L. ; Dowdeswell J.A. ; Benham T.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 147 起始页码: 136
结束页码: 147
语种: 英语
英文关键词: Full Stokes models
; Ice sheet models
; ISCAL method
; Palaeo-ice sheets
; Shallow ice approximation
; Simulations
; Svalbard
Scopus关键词: Aluminum
; Glaciers
; Sea level
; Ice sheet
; Ice sheet models
; ISCAL method
; Shallow ice approximations
; Simulations
; Stokes model
; Svalbard
; Ice
英文摘要: Full Stokes ice sheet models provide the most accurate description of ice sheet flow, and can therefore be used to reduce existing uncertainties in predicting the contribution of ice sheets to future sea level rise on centennial time-scales. The level of accuracy at which millennial time-scale palaeo-ice sheet simulations resolve ice sheet flow lags the standards set by Full Stokes models, especially, when Shallow Ice Approximation (SIA) models are used. Most models used in paleo-ice sheet modeling were developed at a time when computer power was very limited, and rely on several assumptions. At the time there was no means of verifying the assumptions by other than mathematical arguments. However, with the computer power and refined Full Stokes models available today, it is possible to test these assumptions numerically. In this paper, we review (Ahlkrona et al., 2013a) where such tests were performed and inaccuracies in commonly used arguments were found. We also summarize (Ahlkrona et al., 2013b) where the implications of the inaccurate assumptions are analyzed for two paleo-models – the SIA and the SOSIA. We review these works without resorting to mathematical detail, in order to make them accessible to a wider audience with a general interest in palaeo-ice sheet modelling. Specifically, we discuss two implications of relevance for palaeo-ice sheet modelling. First, classical SIA models are less accurate than assumed in their original derivation. Secondly, and contrary to previous recommendations, the SOSIA model is ruled out as a practicable tool for palaeo-ice sheet simulations. We conclude with an outlook concerning the new Ice Sheet Coupled Approximation Level (ISCAL) method presented in Ahlkrona et al. (2016), that has the potential to match the accuracy standards of full Stokes model on palaeo-timescales of tens of thousands of years, and to become an alternative to hybrid models currently used in palaeo-ice sheet modelling. The method is applied to an ice sheet covering Svalbard. © 2016 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59506
Appears in Collections: 过去全球变化的重建
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作者单位: Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden; Department of Physical Geography, Stockholm University, Stockholm, Sweden; Department of Information Technology, Division of Scientific Computing, Uppsala University, Box 337, Uppsala, Sweden; Department of Arctic Geology, The University Center in Svalbard (UNIS), P.O. Box 156, Longyearbyen, Norway; Scott Polar Research Institute, University of Cambridge, Cambridge, England, United Kingdom
Recommended Citation:
Kirchner N.,Ahlkrona J.,Gowan E.J.,et al. Shallow ice approximation, second order shallow ice approximation, and full Stokes models: A discussion of their roles in palaeo-ice sheet modelling and development[J]. Quaternary Science Reviews,2016-01-01,147