Discussion
Assertion (A): Sudden stratospheric warmings occur only in winter.
Reason (R): Planetary waves propagate vertically only through westerly winds below a critical speed.
Select the correct answer from the options below.
Answer: A
Summer stratospheric easterlies block vertical propagation entirely, so no wave activity reaches the summer stratosphere to break there. Only in winter are the winds westerly and weak enough for the longest waves to ascend. The reason therefore explains the assertion completely, and the Charney-Drazin criterion that supplies it is one of the cleanest links between tropospheric and stratospheric dynamics.
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