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The slow motion of polar ice sheets is governed by the viscous deformation of anisotropic ices. Physical mechanisms controlling the deformation of ice crystal and polycrystal are reviewed. For the low stress conditions prevailing in ice sheets, the stress exponent of the flow law is lower than 2 and the deformation is dominated by the glide of dislocations on the basal plane. The mismatch of slip...
Possible dislocation Burgers vectors and core structures in ice are discussed, and compared with those in crystals with closely related structures such as semiconductors. Theoretical expressions for dislocation velocities are given, on the basis of microscopic mechanisms in dislocation cores, implicitly including the possible role of protonic disorder and core reconstruction. Macroscopic plastic properties...
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