Discussion
The Nino 3.4 index measures
Answer: A
Correct answer: sea surface temperature in a defined region
Nino 3.4 is the average sea surface temperature anomaly in a box spanning 5 degrees north to 5 south and 170 to 120 degrees west, in the central and east-central equatorial Pacific. It has become the standard index because that region is where the coupling between ocean and atmosphere is strongest, so it correlates best with the global teleconnections.
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