Discussion
Which quantity gives the Rossby depth scale?
Answer: D
Multiplying the horizontal scale by \( f/N \), about one in a hundred in the troposphere, gives the depth over which a disturbance of that width influences the flow. A synoptic scale disturbance a thousand kilometres wide therefore reaches through about ten kilometres, which is the whole troposphere. This is the vertical counterpart of the deformation radius and explains the observed aspect ratio of weather systems.
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