气候变化领域集成服务门户(CCPortal): Parameter optimization in sea ice models with elastic-viscoplastic rheology

CCPortal

DOI	10.5194/tc-14-4427-2020
	Parameter optimization in sea ice models with elastic-viscoplastic rheology
	Panteleev G.; Yaremchuk M.; Stroh J.N.; Francis O.P.; Allard R.
发表日期	2020
ISSN	19940416
起始页码	4427
结束页码	4451
卷号	14 期号:12
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).
英文关键词	elasticity; ice thickness; optimization; parameterization; rheology; sea ice; viscoplasticity
语种	英语
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202174
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
推荐引用方式 GB/T 7714	Panteleev G.,Yaremchuk M.,Stroh J.N.,et al. Parameter optimization in sea ice models with elastic-viscoplastic rheology[J],2020,14(12).
APA	Panteleev G.,Yaremchuk M.,Stroh J.N.,Francis O.P.,&Allard R..(2020).Parameter optimization in sea ice models with elastic-viscoplastic rheology.Cryosphere,14(12).
MLA	Panteleev G.,et al."Parameter optimization in sea ice models with elastic-viscoplastic rheology".Cryosphere 14.12(2020).