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Interdecadal Pacific Oscillation ( IPO )

The IPO is characterized by sea surface temperature fluctuations and sea level pressure changes in the north and south Pacific Ocean that occur on a 15-30year cycle. 

During positive phases, ocean temperatures are warmer in the tropical Pacific, but cooler than average in the north Pacific. 

During negative phases of the IPO, Pacific Ocean temperatures are cooler than average in thetropical regions and warmer than average in the northern regions.  

The IPO is similar to the Pacific Decadal Oscillation (PDO) in terms of sea temperature changes, but affects ocean waters south of 20°N Latitude, which the PDO does not.