Results 11 to 20 of about 574,262 (277)
Granular Effects in Sea Ice Rheology in the Marginal Ice Zone [PDF]
Philosophical Transactions Series A, Mathematical, Physical, and Engineering Sciences, 2022 Sea ice in the marginal ice zone (MIZ) consists of relatively small floes with a wide size span. In response to oceanic and atmospheric forcing, it behaves as an approximately two-dimensional, highly polydisperse granular material. The established viscous-plastic rheologies used in continuum sea ice models are not suitable for the ...
Agnieszka Herman
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Rheology of an Ice-Floe Field [PDF]
Annals of Glaciology, 1984 The aim of the paper is (1) to develop theory to describe sea ice as a collection of finite-sized floes and (2) to construct a rheology based on this description.Successful sea-ice models have considered the ice to be a two-dimensional continuum with a nonlinear plastic rheology, a two-dimensional yield curve being used to determine the internal ice ...
Iain Bratchie
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Effective Rheology Across the Fragmentation Transition for Sea Ice and Ice Shelves [PDF]
Geophysical Research Letters, 2019 AbstractSea ice and ice shelves can be described by a viscoelastic rheology that is approximately linear elastic and brittle at high strain rates and viscously shear thinning at low strain rates. Brittle ice easily fractures under compressive shear and forms shear bands as the material undergoes a transition to a fragmented, granular state.
J.A. Åström, D.I. Benn
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Processes controlling the downstream evolution of ice rheology in glacier shear margins: case study on Rutford Ice Stream, West Antarctica [PDF]
Journal of Glaciology, 2018 Ice rheology governs how glaciers flow and respond to environmental change. The rheology of glacier ice evolves in response to a variety of mechanisms, including damage, heating, melting and the development of crystalline fabric.
BRENT M. MINCHEW +4 more
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Dynamics of Ice Mass Deformation: Linking Processes to Rheology, Texture, and Microstructure
Geochemistry, Geophysics, Geosystems, 2013 Prediction of glacier and polar ice sheet dynamics is a major challenge, especially in view of changing climate. The flow behavior of an ice mass is fundamentally linked to processes at the grain and subgrain scale.
Sandra Piazolo +2 more
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Ice bridges and ridges in the Maxwell-EB sea ice rheology [PDF]
The Cryosphere, 2017 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 ...
V. Dansereau +4 more
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Implementation of a brittle sea ice rheology in an Eulerian, finite-difference, C-grid modeling framework: impact on the simulated deformation of sea ice in the Arctic [PDF]
Geoscientific Model DevelopmentWe have implemented the brittle Bingham–Maxwell sea ice rheology (BBM) into SI3, the sea ice component of NEMO. After discussing the numerical aspects and requirements that are specific to the implementation of a brittle rheology in the Eulerian, finite-
L. Brodeau +3 more
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Semi-brittle rheology and ice dynamics in DynEarthSol3D [PDF]
The Cryosphere, 2017 We present a semi-brittle rheology and explore its potential for simulating glacier and ice sheet deformation using a numerical model, DynEarthSol3D (DES), in simple, idealized experiments.
L. C. Logan +4 more
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Drivers of Pine Island Glacier speed-up between 1996 and 2016 [PDF]
The Cryosphere, 2021 Pine Island Glacier in West Antarctica is among the fastest changing glaciers worldwide. Over the last 2 decades, the glacier has lost in excess of a trillion tons of ice, or the equivalent of 3 mm of sea level rise.
J. De Rydt +3 more
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On the nonlinear viscosity of the orthotropic bulk rheology
Journal of Glaciology, 2022 We compare different ways the bulk flow nonlinearity of glacier ice can be captured in an orthotropic rheology. Specifically, we compare the unapproximated orthotropic rheology, derived from plastic potential theory, to existing approximations that ...
Nicholas M. Rathmann, David A. Lilien
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