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Which characteristic of the quasi-biennial oscillation is most distinctive?

  • A.The oscillation occurs simultaneously at every level so that the whole stratosphere reverses together
  • B.The wind regimes descend with time
  • C.The wind regimes ascend with time, following the upward propagation of the waves that generate them
  • D.The period is exactly two years

Answer: B

Each wind regime appears near 10 hectopascals and propagates downward to about 70 hectopascals over roughly a year, which is the signature feature of the oscillation. The descent occurs because each wave type is absorbed at the level where the shear allows, progressively lowering the absorption level. The period averages 28 months rather than exactly 24, which is why it is called quasi-biennial. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.

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