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Match each phase of the oscillation with its Pacific conditions.
List I
A. El Nino
B. La Nina
C. Neutral
D. Southern Oscillation
List II
1. trades and temperature gradient near their average
2. weak trades and a warm eastern Pacific
3. the atmospheric pressure seesaw that accompanies them
4. strong trades and a cold eastern Pacific

  • A.A-2, B-4, C-1, D-3
  • B.A-4, B-2, C-1, D-3
  • C.A-2, B-4, C-3, D-1
  • D.A-3, B-1, C-4, D-2

Answer: A

The ocean and atmosphere components are two faces of one phenomenon, which is why the combined term ENSO is used. Neither can be understood on its own. The two phases are opposite in every respect. The combined term reflects the coupling.

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