Figure 4.2 Double Ekman spiral. The lower spiral shows a 50-fold gain.

dzj di^ dzi

dz2 dv2

It is suggested here that the ocean surface is horizontal and the eddy viscosity coefficients kM1, kM2 do not vanish at the air-ice and ice-water interfaces.

When guiding the x axis along the direction of the geostrophic wind ( Vgi =0) and assuming that u0, v0 « (7gl, then the expressions for the components of the ice drift velocity will take the form

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