Discussion
Assertion (A): An air column that is stretched vertically acquires greater cyclonic vorticity.
Reason (R): Potential vorticity, the absolute vorticity divided by the depth, is conserved following the motion.
Select the correct answer from the options below.
Answer: A
If the ratio of absolute vorticity to depth is fixed, increasing the depth requires the absolute vorticity to increase in proportion. The reason therefore explains the assertion exactly. This single argument accounts for lee cyclogenesis east of mountain ranges, for the intensification of columns moving from shallow to deep water in laboratory experiments, and for much of the vorticity budget of developing cyclones.
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