Abstract
We study the evolution of initially axisymmetric, large scale (Bu ≪ 1), geostrophic (Ro ≪ 1), barotropic vortices. In such a parameter regime, asymptotic expansion of rotating shallow water (RSW) leads to the frontal geostrophic (FG) model which is numerically implemented. Both in FG and in RSW, anticyclones travel westward faster than cyclones. In FG, vortices of both signs show initially a secondary meridional northward drift which we detail. However this last feature is not present in RSW numerical simulations. Vortices behave like quasi-geostrophic (QG) vortices i.e, showing an initial meridional drift that depends on vortex sign.
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