DOI: 10.5194/tc-11-2033-2017
Scopus记录号: 2-s2.0-85028841691
论文题名: Ice bridges and ridges in the Maxwell-EB sea ice rheology
作者: Dansereau V ; , Weiss J ; , Saramito P ; , Lattes P ; , Coche E
刊名: Cryosphere
ISSN: 19940416
出版年: 2017
卷: 11, 期: 5 起始页码: 2033
结束页码: 2058
语种: 英语
英文关键词: elastic modulus
; fjord
; ice cover
; ice ridge
; kinematics
; Mohr theory
; polynya
; rheology
; software
; tensile strength
; viscosity
; Arctic
; Nares Strait
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75510
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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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
Recommended Citation:
Dansereau V,, Weiss J,, Saramito P,et al. Ice bridges and ridges in the Maxwell-EB sea ice rheology[J]. Cryosphere,2017-01-01,11(5)