Sorry, but this doesn't fit here.
Normally, as one goes up in the atmosphere, the temperature goes down. When hot air heated at the surface rises, it rapidly cools.
In an inversion, warm air traps cold air beneath it. IOW, it illustrates qam1's point, it doesn't refute it.
My bad choice of examples.
Normally, as one goes up in the atmosphere, the temperature goes down.
Actually, around here there is often a marine sublayer that is cooler at lower altitude with warmer air trapping it that then cools off even more at higher altitude, making a sandwich so to speak. The boundaries are rather stark as temperature on my property can vary by 15° from lower elevations to higher.
In the case of the oceans, the Pacific Decadal Oscillation take 30 years or more to complete that does bring colder water to the surface. The warmist claim is that when the PDO last reversed in 1997 the water trapped below is warmer than it otherwise would have been without AGW and that the cooler water now at the surface has not heated yet. At least, that is my minimal understanding of the claim.