cartesian tangent plane coordinates, derive the horizontal divergence and the ver- al vorticity of the geostrophic wind assuming (a) f is constant (b) ƒ = 2Nsin[po+ radius of the Earth and the latitude o+y/Re. In or- Re)] where Re r to avoid having to make assumptions about p, use the pressure-coordinate (i.e. opotential) formulation for the geostrophic wind. [Not in Holton] = =

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