气候变化领域集成服务门户(CCPortal): Ice bridges and ridges in the Maxwell-EB sea ice rheology

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DOI	10.5194/tc-11-2033-2017
	Ice bridges and ridges in the Maxwell-EB sea ice rheology
	Dansereau V.; Weiss J.; Saramito P.; Lattes P.; Coche E.
发表日期	2017
ISSN	19940416
卷号	11 期号:5
英文摘要	This paper presents a first implementation of a new rheological model for sea ice on geophysical scales. This continuum model, called Maxwell elasto-brittle (Maxwell-EB), is based on a Maxwell constitutive law, a progressive damage mechanism that is coupled to both the elastic modulus and apparent viscosity of the ice cover and a Mohr-Coulomb damage criterion that allows for pure (uniaxial and biaxial) tensile strength. The model is tested on the basis of its capability to reproduce the complex mechanical and dynamical behaviour of sea ice drifting through a narrow passage. Idealized as well as realistic simulations of the flow of ice through Nares Strait are presented. These demonstrate that the model reproduces the formation of stable ice bridges as well as the stoppage of the flow, a phenomenon occurring within numerous channels of the Arctic. In agreement with observations, the model captures the propagation of damage along narrow arch-like kinematic features, the discontinuities in the velocity field across these features dividing the ice cover into floes, the strong spatial localization of the thickest, ridged ice, the presence of landfast ice in bays and fjords and the opening of polynyas downstream of the strait. The model represents various dynamical behaviours linked to an overall weakening of the ice cover and to the shorter lifespan of ice bridges, with implications in terms of increased ice export through narrow outflow pathways of the Arctic. © 2017 Author(s). This work is distributed under the Creative Commons Attribution 3.0 License.
学科领域	elastic modulus; fjord; ice cover; ice ridge; kinematics; Mohr theory; polynya; rheology; software; tensile strength; viscosity; Arctic; Nares Strait
语种	英语
scopus关键词	elastic modulus; fjord; ice cover; ice ridge; kinematics; Mohr theory; polynya; rheology; software; tensile strength; viscosity; Arctic; Nares Strait
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/119340
作者单位	Institut des Sciences de la Terre, CNRS UMR 5275, Université de Grenoble, Grenoble, France; Laboratoire Jean Kuntzmann, CNRS UMR 5224, Université de Grenoble, Grenoble, France; TOTAL S.A., DGEP/DEV/TEC/GEO, Paris, France; TOTAL S.A., DGEP/AF/CG-TEPCG/DBD/DDP/DMHB, Pointe Noire-Poincare, Congo
推荐引用方式 GB/T 7714	Dansereau V.,Weiss J.,Saramito P.,et al. Ice bridges and ridges in the Maxwell-EB sea ice rheology[J],2017,11(5).
APA	Dansereau V.,Weiss J.,Saramito P.,Lattes P.,&Coche E..(2017).Ice bridges and ridges in the Maxwell-EB sea ice rheology.Cryosphere,11(5).
MLA	Dansereau V.,et al."Ice bridges and ridges in the Maxwell-EB sea ice rheology".Cryosphere 11.5(2017).