Abstract
The topography of the underside of sea ice is dominated by ice keels (often tens of metres deep) separated by expanses of relatively flat ice extending hundreds of metres horizontally (Davis & Wadhams 1995). However, there is evidence of some local variability in the thickness of sea ice in the flat regions (Wettlaufer 1991) of several centimetres over distances of about a metre. Such variations contribute to the drag exerted by sea ice on the ocean and enhance gravity drainage of brine from its interstices. We describe here a mechanism that can generate corrugations on the underside of sea ice in the presence of ocean shear, caused predominantly by wind-driven drift of the ice.
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