Discussion
Which conclusion follows about the depth of a small-scale vortex?
Answer: B
The Rossby height is proportional to the horizontal scale, so a vortex of 100 kilometres width influences only about a kilometre of depth. This is why mesoscale vortices are shallow features while synoptic cyclones are deep ones. The result also explains why an upper level potential vorticity anomaly must be reasonably broad if it is to induce any appreciable circulation at the surface far below it.
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