CRYSTAL ORIENTATION IN ICE SHEETS

Author:

Perey F. G. J.,Pounder E. R.

Abstract

Crystal size and orientation in ice sheets frozen under one-dimensional cooling from melts of pure water or melts containing traces of organic additives were studied using a polariscope with a universal stage. The surface layer is found to consist of crystals with nearly vertical optic axes. Horizontal sections cut at various depths show a gradual change of the mean orientation of the optic axes towards the horizontal. The change to horizontal inclinations is almost completed at depths of 4 or 5 cm. under the freezing conditions used, and occurs more rapidly with the melts containing additives. With additives the ice sheet shows another feature also, a transition layer about 0.5 cm. below the surface. In this layer the crystals are much smaller than in the surface layer above them and the number of crystals extending through this layer is small.An explanation of the observations is offered, in terms of preferred growth of an ice crystal in planes perpendicular to the optic axis. This provides a mechanism permitting more rapid growth of crystals with inclined axes.

Publisher

Canadian Science Publishing

Subject

General Physics and Astronomy

Reference2 articles.

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