The Dictionary of the Climate Debate (DCD)

Definition: Pacific Decadal Oscillation, a pattern of Pacific ocean climate variability that shifts phases every 20 to 30 years.

It causes a change from warm to cool surface waters (and vice versa) in the Pacific Ocean north of 20° N.

During a warm phase, the western Pacific becomes cool and part of the eastern Pacific warms. During a cool phase, the opposite occurs.

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