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Which cloud type forms beneath a subsidence inversion over the ocean?

  • A.Altocumulus lenticularis, which forms at the crest of a standing wave in the lee of a mountain barrier
  • B.Stratocumulus
  • C.Cumulonimbus, which requires deep instability and therefore cannot form beneath any capping inversion at all
  • D.Cirrus

Answer: B

The cool moist marine boundary layer capped by a subsidence inversion produces the extensive stratocumulus decks of the eastern subtropical oceans, which are among the most important cloud features in the global radiation budget. Their brightness and extent make small changes in their coverage a large climate feedback. Deep convection is precisely what the inversion prevents. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.

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