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Which region shows the most extensive marine stratocumulus?

  • A.The polar oceans
  • B.The middle latitudes of the North Atlantic, where the storm track brings frequent frontal cloud systems
  • C.The eastern subtropical oceans
  • D.The western tropical Pacific warm pool, where the sea surface temperature reaches its greatest values

Answer: C

Cold upwelling water beneath strong subsidence off California, Peru, Namibia and Australia produces the most persistent stratocumulus decks on Earth. Their high albedo over a dark ocean makes them a large negative radiative influence. The warm pool supports deep convection instead, and the storm tracks produce transient frontal cloud rather than persistent decks. Most errors here come from carrying a result across from a neighbouring case where it does not hold.

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