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Western Pacific Warm Pool

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Article Information
Category: Weather Weather
Content source: SKYbrary About SKYbrary
Content control: SKYbrary About SKYbrary
Tag(s) Climatic Phenomena


The Pacific Warm Pool (PWP) is defined as the area in the Western Tropical Pacific enclosed by the 28.5 deg C isotherm.

This body of water, which spans the western waters of the equatorial Pacific to the eastern Indian Ocean, holds the warmest seawaters in the world. Scientists found that, over a period of roughly two decades, the warm pool’s average annual temperatures and dimensions increase and then decrease like a slowly pulsating beacon.

South Pacific Convergence Zone


Because these waters are hot enough to drive heat and moisture high into the atmosphere, the warm pool has a large effect on the climate of surrounding lands. In fact, the slow fluctuations of size and intensity of the warm pool may be linked with the intensity of El Niño.

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