Results 41 to 50 of about 6,415 (289)

Making EBSD on water ice routine [PDF]

, 2015
Electron backscatter diffraction (EBSD) on ice is a decade old. We have built upon previous work to select and develop methods of sample preparation and analysis that give >90% success rate in obtaining high-quality EBSD maps, for the whole surface area (
Daghlian, C., Seidemann, M., Becroft, L., Lilly, K., NWO-NSO: The role of grain size in the rheology of planetary ice, Durham, W. B., Golding, N., Piazolo, S., Caswell, T., Prior, D. J., Structural geology and EM, Diebold, S., Vaughan, M., Easingwood, R., Baker, I., Goldsby, D., Obbard, R., Wilson, C. J L   +17 more
core   +1 more source

Sediment behavior controls equilibrium width of subglacial channels

Journal of Glaciology, 2017
Flow-frictional resistance at the base of glaciers and ice sheets is strongly linked to subglacial water pressure. Understanding the physical mechanisms that govern meltwater fluxes in subglacial channels is hence critical for constraining variations in ...
ANDERS DAMSGAARD, JENNY SUCKALE, JAN A. PIOTROWSKI, MORGANE HOUSSAIS, MATTHEW R. SIEGFRIED, HELEN A. FRICKER   +5 more
doaj   +1 more source

Effect of an orientation-dependent non-linear grain fluidity on bulk directional enhancement factors

Journal of Glaciology, 2021
Bulk directional enhancement factors are determined for axisymmetric (girdle and single-maximum) orientation fabrics using a transversely isotropic grain rheology with an orientation-dependent non-linear grain fluidity.
Nicholas M. Rathmann, Christine S. Hvidberg, Aslak Grinsted, David A. Lilien, Dorthe Dahl-Jensen   +4 more
doaj   +1 more source

Deformation in Rutford Ice Stream, West Antarctica: measuring shear-wave anisotropy from icequakes [PDF]

, 2013
Ice streams provide major drainage pathways for the Antarctic ice sheet. The stress distribution and style of flow in such ice streams produce elastic and rheological anisotropy, which informs ice-flow modelling as to how ice masses respond to external
Baird, A.F., Smith, A.M., Baird, A F, Stuart, G.W., Harland, S. R., Stuart, G. W., Kendall, J-M, Pritchard, H.D., Harland, S.R., Smith, A. M., Pritchard, H. D., Kendall, J.-M., Brisbourne, A.M., Brisbourne, A. M., Lloyd, G.E., Lloyd, G. E.   +15 more
core   +1 more source

On the physical basis for the creep of ice: the high temperature regime

Journal of Glaciology, 2020
This work quantifies the increased temperature sensitivity of the constitutive behavior of ice with proximity to the melting point in terms of dislocation mechanics.
D.M. Cole
doaj   +1 more source

Strengthening of columnar-grained freshwater ice through cyclic flexural loading

Journal of Glaciology, 2020
Systematic experiments reveal that the flexural strength of freshwater S2 columnar-grained ice loaded normal to the columns increases upon cyclic loading.
Andrii Murdza, Erland M. Schulson, Carl E. Renshaw   +2 more
doaj   +1 more source

Rheology of Discrete Failure Regimes of Anisotropic Sea Ice [PDF]

Journal of Physical Oceanography, 2012
ABSTRACT A rheological model of sea ice is presented that incorporates the orientational distribution of ice thickness in leads embedded in isotropic floe ice. Sea ice internal stress is determined by coulombic, ridging and tensile failure at orientations where corresponding failure criteria are satisfied at minimum stresses. Because sea
Wilchinsky, Alexander V., Feltham, Daniel L.   +1 more
openaire   +1 more source

Firn densification in two dimensions: modeling the collapse of snow caves and enhanced densification in ice-stream shear margins

Journal of Glaciology
Accurate modeling of firn densification is necessary for ice core interpretation and assessing the mass balance of glaciers and ice sheets. In this paper, we revisit the nonlinear-viscous firn rheology introduced by Gagliardini and Meyssonnier (1997 ...
Jon Arrizabalaga-Iriarte, Lide Lejonagoitia-Garmendia, Christine S. Hvidberg, Aslak Grinsted, Nicholas M. Rathmann   +4 more
doaj   +1 more source

A Maxwell elasto-brittle rheology for sea ice modelling [PDF]

The Cryosphere, 2016
Abstract. A new rheological model is developed that builds on an elasto-brittle (EB) framework used for sea ice and rock mechanics, with the intent of representing both the small elastic deformations associated with fracturing processes and the larger deformations occurring along the faults/leads once the material is highly damaged and fragmented.
Dansereau, Véronique, Weiss, Jérôme, Saramito, Pierre, Lattes, Philippe   +3 more
openaire   +5 more sources

Improving the spatial distribution of modeled Arctic sea ice thickness

, 2005
The spatial distribution of ice thickness/draft in the Arctic Ocean is examined using a sea ice model. A comparison of model predictions with submarine observations of sea ice draft made during cruises between 1987 and 1997 reveals that the model has the
Laxon, SW, Miller, PA, Feltham, DL, Laxon, S. W., Feltham, D. L., Miller, P. A.   +5 more
core   +1 more source