Discussion
Which quantity sets the vertical reach of a potential vorticity anomaly?
Answer: B
The Rossby depth scale, equal to the horizontal scale multiplied by \( f/N \), determines how far the induced circulation penetrates. A larger anomaly therefore reaches further, and a more strongly stratified atmosphere confines it more closely. This is the vertical counterpart of the deformation radius and gives a clean physical criterion for whether an upper anomaly can interact with the surface at all.
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