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During an El Nino event the trade winds

  • A.strengthen very considerably indeed
  • B.reverse to blow from the poles
  • C.are entirely unchanged by it
  • D.weaken and warm water spreads east

Answer: D

The warm pool migrates east, upwelling off South America is suppressed and the whole Walker cell weakens. La Nina is the opposite phase, with stronger trades and colder eastern water. The Walker cell weakens through the event.

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