Discussion
Assertion (A): The jet stream is found near the tropopause rather than at the surface.
Reason (R): The thermal wind accumulates shear through the depth over which a temperature gradient persists.
Select the correct answer from the options below.
Answer: D
Because the westerly shear adds up through the whole troposphere, the wind reaches its maximum at the level where the temperature gradient reverses, which is the tropopause. The reason therefore explains the assertion completely. It also explains why the jet weakens again in the lower stratosphere, where the reversed gradient produces easterly shear that subtracts from the accumulated westerly wind below.
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