DOI: 10.5194/tc-14-4427-2020
论文题名: Parameter optimization in sea ice models with elastic-viscoplastic rheology
作者: Panteleev G. ; Yaremchuk M. ; Stroh J.N. ; Francis O.P. ; Allard R.
刊名: Cryosphere
ISSN: 19940416
出版年: 2020
卷: 14, 期: 12 起始页码: 4427
结束页码: 4451
语种: 英语
英文关键词: elasticity
; ice thickness
; optimization
; parameterization
; rheology
; sea ice
; viscoplasticity
英文摘要: The modern sea ice models include multiple parameters which strongly affect model solution. As an example, in the CICE6 community model, rheology and landfast grounding/arching effects are simulated by functions of the sea ice thickness and concentration with a set of fixed parameters empirically adjusted to optimize the model performance. In this study, we consider the extension of a twodimensional elastic-viscoplastic (EVP) sea ice model using a spatially variable representation of these parameters. The feasibility of optimization of the landfast sea ice parameters and rheological parameters is assessed via idealized variational data assimilation experiments with synthetic observations of ice concentration, thickness and velocity. The experiments are configured for a 3 d data assimilation window in a rectangular basin with variable wind forcing. The tangent linear and adjoint models featuring EVP rheology are found to be unstable but can be stabilized by adding a Newtonian damping term into the adjoint equations. A set of observation system simulation experiments shows that landfast parameter distributions can be reconstructed after 5-10 iterations of the minimization procedure. Optimization of sea ice initial conditions and spatially varying parameters in the stress tensor equation requires more computation but provides a better hindcast of the sea ice state and the internal stress tensor. Analysis of inaccuracy in the wind forcing and errors in sea ice thickness observations show reasonable robustness of the variational DA approach and the feasibility of its application to available and incoming observations. © 2020 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164552
Appears in Collections: 气候变化与战略
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作者单位: Naval Research Laboratory, Stennis Space CenterMS, United States; University of Colorado, Aurora, CO, United States; University of Hawai'i at Mänoa, Honolulu, HI, United States
Recommended Citation:
Panteleev G.,Yaremchuk M.,Stroh J.N.,et al. Parameter optimization in sea ice models with elastic-viscoplastic rheology[J]. Cryosphere,2020-01-01,14(12)