气候变化领域集成服务门户(CCPortal): Landfast sea ice material properties derived from ice bridge simulations using the Maxwell elasto-brittle rheology

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DOI	10.5194/tc-14-2137-2020
	Landfast sea ice material properties derived from ice bridge simulations using the Maxwell elasto-brittle rheology
	Plante M.; Tremblay B.; Losch M.; Lemieux J.-F.
发表日期	2020
ISSN	19940416
起始页码	2137
结束页码	2157
卷号	14 期号:6
英文摘要	The Maxwell elasto-brittle (MEB) rheology is implemented in the Eulerian finite-difference (FD) modeling framework commonly used in classical viscous-plastic (VP) models. The role of the damage parameterization, the cornerstone of the MEB rheology, in the formation and collapse of ice arches and ice bridges in a narrow channel is investigated. Ice bridge simulations are compared with observations to derive constraints on the mechanical properties of landfast sea ice. Results show that the overall dynamical behavior documented in previous MEB models is reproduced in the FD implementation, such as the localization of the damage in space and time and the propagation of ice fractures in space at very short timescales. In the simulations, an ice arch is easily formed downstream of the channel, sustaining an ice bridge upstream. The ice bridge collapses under a critical surface forcing that depends on the material cohesion. Typical ice arch conditions observed in the Arctic are best simulated using a material cohesion in the range of 5-10 kN m-2. Upstream of the channel, fracture lines along which convergence (ridging) takes place are oriented at an angle that depends on the angle of internal friction. Their orientation, however, deviates from the Mohr-Coulomb theory. The damage parameterization is found to cause instabilities at large compressive stresses, which prevents the production of longer-term simulations required for the formation of stable ice arches upstream of the channel between these lines of fracture. Based on these results, we propose that the stress correction scheme used in the damage parameterization be modified to remove numerical instabilities. © 2020 Author(s).
英文关键词	brittle deformation; elasticity; Eulerian analysis; finite difference method; fluid mechanics; parameterization; rheology; sea ice
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/202180
作者单位	Department of Atmospheric and Oceanic Sciences, McGill University, Montréal, QC, Canada; Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany; Recherche en Prévision Numérique Environnementale, Environnement et Changement Climatique Canada, Dorval, QC, Canada
推荐引用方式 GB/T 7714	Plante M.,Tremblay B.,Losch M.,et al. Landfast sea ice material properties derived from ice bridge simulations using the Maxwell elasto-brittle rheology[J],2020,14(6).
APA	Plante M.,Tremblay B.,Losch M.,&Lemieux J.-F..(2020).Landfast sea ice material properties derived from ice bridge simulations using the Maxwell elasto-brittle rheology.Cryosphere,14(6).
MLA	Plante M.,et al."Landfast sea ice material properties derived from ice bridge simulations using the Maxwell elasto-brittle rheology".Cryosphere 14.6(2020).