Discussion
Consider the following statements about the Southern Oscillation Index.
1. A strongly negative index accompanies El Nino.
2. A strongly positive index accompanies La Nina.
3. The index is computed from sea surface temperature.
Answer: D
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: a strongly negative index means unusually low pressure at Tahiti and high at Darwin, the weakened gradient that accompanies El Nino, and a strongly positive index accompanies La Nina. Statement 3 confuses the two families of index - the Southern Oscillation Index is computed from pressure, while the Nino indices are computed from sea surface temperature.
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