气候变化领域集成服务门户(CCPortal): Parameter sensitivity analysis of dynamic ice sheet models

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DOI	10.5194/tc-14-673-2020
	Parameter sensitivity analysis of dynamic ice sheet models - Numerical computations
	Cheng G.; Lötstedt P.
发表日期	2020
ISSN	19940416
起始页码	673
结束页码	691
卷号	14 期号:2
英文摘要	The friction coefficient and the base topography of a stationary and a dynamic ice sheet are perturbed in two models for the ice: the full Stokes equations and the shallow shelf approximation. The sensitivity to the perturbations of the velocity and the height at the surface is quantified by solving the adjoint equations of the stress and the height equations providing weights for the perturbed data. The adjoint equations are solved numerically and the sensitivity is computed in several examples in two dimensions. A transfer matrix couples the perturbations at the base with the perturbations at the top. Comparisons are made with analytical solutions to simplified problems. The sensitivity to perturbations depends on their wavelengths and the distance to the grounding line. A perturbation in the topography has a direct effect at the ice surface above it, while a change in the friction coefficient is less visible there. © 2020 Copernicus GmbH. All rights reserved.
英文关键词	friction; ice sheet; numerical model; parameter estimation; perturbation; sensitivity analysis; Stokes formula; topography
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/202048
作者单位	Department of Information Technology, Uppsala University, P.O. Box 337, Uppsala, 75105, Sweden
推荐引用方式 GB/T 7714	Cheng G.,Lötstedt P.. Parameter sensitivity analysis of dynamic ice sheet models - Numerical computations[J],2020,14(2).
APA	Cheng G.,&Lötstedt P..(2020).Parameter sensitivity analysis of dynamic ice sheet models - Numerical computations.Cryosphere,14(2).
MLA	Cheng G.,et al."Parameter sensitivity analysis of dynamic ice sheet models - Numerical computations".Cryosphere 14.2(2020).