You know how the weather is : one day blowy, next day rain. The air, the atmopshere, is full of shifting, changing things like clouds, winds and pressure systems. All cyclonic and swirling and driving and stormy.
But you know, the seas are quieter, more regular and reliable, the ocean is calm and steady, deep under the surface that gets whipped up by the winds and the hurricanes and typhoons.
You would expect the atmospheric temperatures to chop and change, just as they do on the ground. But out at sea, it’s a different matter. Slowly but surely, planetary heat imbalance would warm up the whole world ocean. Like cooking soup on the camp fire.
And to use a current meme-phrase : the data’s in. After people went to the enormous trouble of dropping thousands of floating observation stations all over the world’s oceans, the picture of what’s happening to heat in the water is becoming clearer by the day.