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The period of oscillation is roughly 15–30 years. Positive phases of the IPO are characterized by a warmer than average tropical
Pacific and cooler than average northern Pacific. Negative phases are characterized by an inversion of this pattern, with cool tropics and warm northern regions.
60:(PDO), but occurring in a wider area of the Pacific. While the PDO occurs in mid-latitudes of the Pacific Ocean in the northern hemisphere, the IPO stretches from the southern hemisphere into the northern hemisphere.
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The IPO had positive phases (southeastern tropical
Pacific warm) from 1922 to 1946 and 1978 to 1998, and a negative phase between 1947 and 1976.
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