Answer :
The east-west seesaw oscillation in sea-surface temperatures across the north pacific ocean is characteristic of The Pacific Decadal Oscillation (PDO)
A strong, recurrent pattern of ocean-atmosphere climatic variability, the Pacific decadal oscillation (PDO) is centred over the mid-latitude Pacific basin. North of 20°N, the PDO is identified as warm or cool surface waters in the Pacific Ocean. The magnitude of this climate pattern has fluctuated erratically at interannual to interdecadal time intervals throughout the past century (meaning time periods of a few years to as much as time periods of multiple decades). Around 1925, 1947, and 1977, there is evidence of reversals in the oscillation's dominant polarity (i.e., changes in the ratio of cool to warm surface waters in the area).
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