The PDO and El Niño occur in slightly different regions of the Pacific – the PDO is a northern Pacific phenomenon; El Niño is centered in the tropics.
They also behave differently. PDO phases last decades. Because each PDO phase is long, and the air-sea interactions require many years to adjust, the effects of PDO phase changes, or ‘regime shifts”, are predictable for up to 10 years. During warm (positive) phases of the PDO, warmer than average ocean water sits very near the western coast of North America. During cool (negative) phases, cooler waters are present there.
The PDO and El Niño occur in slightly different regions of the Pacific – the PDO is a northern Pacific phenomenon; El Niño is centered in the tropics.They also behave differently. PDO phases last decades. Because each PDO phase is long, and the air-sea interactions require many years to adjust, the effects of PDO phase changes, or ‘regime shifts”, are predictable for up to 10 years. During warm (positive) phases of the PDO, warmer than average ocean water sits very near the western coast of North America. During cool (negative) phases, cooler waters are present there.
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