Sea Ice Drag Laws and Simple Boundary Layer Concepts, Including Application to Rapid Melting,
COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
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Several proposed methods for treating the momentum flux between drifting sea ice and the underlying ocean are interpreted in terms of simple planetary-boundary-layer PBL turbulence theory. The classical two-layer approach, in which the solution for a thin surface layer is matched to an Ekman solution for the outer layer, is used to derive several forms of the drag law. These forms range from linear where stress is proportional to relative speed, through quadratic where stress is proportional to relative speed squared, to a Rossby-similarity law like that used to express frictional drag on geostrophic wind in the atmosphere. Only formulations which conform with Rossby-similarity scaling are consistent with free-drift data from the 1975 AIDJEX drift station experiment.
- Physical and Dynamic Oceanography
- Snow, Ice and Permafrost
- Fluid Mechanics