Discussion
Which among the following is correct for a tropical cyclone ?
Answer: B
In a tropical cyclone the vertical pressure gradient is larger than the horizontal pressure gradient.
Even in a cyclone the atmosphere stays close to hydrostatic balance. Pressure falls by about 1 hPa for every 8-10 m of height, that is roughly 100 hPa per km vertically, while the steepest horizontal gradient near the eyewall is of the order of a few hPa per km. The vertical gradient is therefore much larger.
So the horizontal gradient is not larger, the two are not nearly equal, and the vertical gradient is never zero, since it balances gravity.
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