Results 221 to 230 of about 4,984 (254)
Rate-induced tipping in marine-based regions of the Antarctic ice sheet
Swierczek-Jereczek J +4 more
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Annual Review of Fluid Mechanics, 2008
The polar oceans of Earth are covered by sea ice. On timescales much greater than a day, the motion and deformation of the sea ice cover (i.e., its dynamics) are primarily determined by atmospheric and oceanic tractions on its upper and lower surfaces and by internal ice forces that arise within the ice cover owing to its deformation.
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The polar oceans of Earth are covered by sea ice. On timescales much greater than a day, the motion and deformation of the sea ice cover (i.e., its dynamics) are primarily determined by atmospheric and oceanic tractions on its upper and lower surfaces and by internal ice forces that arise within the ice cover owing to its deformation.
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1998
Laboratory measurements of the brittle and ductile behavior of several of the major icy planetary building materials have been made: water ice phases I through VI, ices in the ammonia-water system, mixtures of water ice plus particulates, and methane clathrate.
W. B. Durham, S. H. Kirby, L. A. Stern
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Laboratory measurements of the brittle and ductile behavior of several of the major icy planetary building materials have been made: water ice phases I through VI, ices in the ammonia-water system, mixtures of water ice plus particulates, and methane clathrate.
W. B. Durham, S. H. Kirby, L. A. Stern
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A review of ice rheology for ice sheet modelling
Cold Regions Science and Technology, 1989Abstract Ice core and borehole studies along flowlines in ice sheets show that the ice crystal structure and flow properties evolve together with strain and rotation along the particle paths. Laboratory studies of initially isotropic polycrystalline ice show that the changes in crystal structure and flow properties of the ice sheets can be simulated ...
W.F. Budd, T.H. Jacka
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Ice flow localisation enhanced by composite ice rheology 
2021<p>Ice&#8217;s predominantly viscous rheology exhibits a significant temperature and strain-rate dependence, commonly captured as a single deformation mechanism by Glen's flow law. However, Glen&#8217;s power-law relationship may fail to capture accurate stress levels at low and elevated strain-rates ultimately leading to ...
Ludovic Räss, Thibault Duretz
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Stability of the Viscous-Plastic Sea Ice Rheology
Journal of Physical Oceanography, 1995The large-scale two-dimensional theology of a sea ice pack arises from the local contact forces between ; adjacent floes in convergence. It is conventionally modeled by a viscous-plastic constitutive relation to reflect the low or zero stress in a divergent flow field and the rate-independent ridging process in convergence. The authors demonstrate how,
Gray, Nico, GRAY, JMNT, KILLWORTH, PD
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A finite-element treatment of sea ice dynamics for different ice rheologies
International Journal for Numerical and Analytical Methods in Geomechanics, 1998Summary: The effects of four different rheologies on the evolution of a large-scale sea ice pack are determined and compared. Two rheologies are of viscous-plastic form, and two are viscous fluid relations. The initial pack domain is rectangular, and the motion is driven by wind stress and resisted by ocean drag.
Schulkes, R. M.S.M. +2 more
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Rheology of water ices V and VI
Journal of Geophysical Research: Solid Earth, 1996We have measured the mechanical strength (σ) of pure water ices V and VI under steady state deformation conditions. Constant displacement rate compressional tests were conducted in a gas apparatus at confining pressures from 400 < P < 800 MPa, temperatures from 209 < T < 270 K, and strain rates 7 × 10−7 < < 7 × 10−4 s−1. Most of the
William B. Durham +2 more
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Ice rheology and tidal heating of Enceladus
Icarus, 2013Abstract For the saturnian satellite Enceladus, the possible existence of a global ocean is a major issue. For the stability of an internal ocean, tidal heating is suggested as an effective heat source. However, assuming Maxwell rheology ice, it has been shown that a global scale ocean on Enceladus cannot be maintained (Roberts, J.F., Nimmo, F. [2008]
D. Shoji +3 more
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Inferring ice rheology in Antarctic ice shelves from remotely sensed observations
2021<p>Glaciers and ice sheets flow as a consequence of ice rheology. At the temperatures and pressures found on Earth, several creep mechanisms allow glacier ice to flow as a non-Newtonian (shear-thinning) viscous fluid. The semi-empirical constitutive relation known as Glen&#8217;s Flow Law is often used to describe ice flow and to ...
Joanna Millstein, Brent Minchew
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