This is unlike, for example, what is observed in the upper troposphere over monsoon regions. However, when the symmetry is broken, by an imposed mean flow or a beta -effect of sufficient magnitude, the flow changes character. 1 shows an example of this behavior in the shallow water model.
Color shows absolute vorticity, contours free surface height.
Four stages of a periodic cycle are shown, for a circulation forced by divergent mass forcing on a beta -plane, at the location of the inner circle. These features are vertically shallow, being hard to detect below about 350 K. Fig.2 shows an example of this behavior. N. This work formed Juno Hsu's Ph.D. thesis. See the paper by Hsu and Plumb in the preprints list .