Oceans have cyclic changes in temps occurring on decades long time scales with upwelling of deep cold water and sinking of warmer surface waters. Until the satellite age, temps were recorded by occasional passing ships and just a half dozen stationary buoys (covering 70% of the Earth's surface!). Not very accurate. Difficult (impossible) to say if oceans are changing temps at all.
Their influence on air temps/weather at any given time are obvious- cf- El Nino/ La Nina phenomena or influence of Gulf Stream on the Iberian Peninsula or the Pacific current on S. Alaska.
From UAH (NOAA) Accuracy of data prior to 1979 is questionable due to the afore mentioned problems of data collection.
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