Discussion
The Southern Oscillation Index is based on the pressure difference between
Answer: C
Correct answer: Tahiti and Darwin
The Southern Oscillation Index is the standardised difference in sea level pressure between Tahiti in the central Pacific and Darwin in northern Australia. Those two stations sit at opposite ends of the Walker circulation, so the difference between them tracks the see-saw in pressure that gives the oscillation its name - and both have long, continuous records, which is why they were chosen.
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