You might have something there. You know of course about diapurs(not baby diapers) and hot spots. The fixed hot spot out in the middle of the pacific plate causes the hawaiian island chain. Even now the new volcano south of the big island is a third of the way to the surface.
Diapurs are sort of like low 9 cumulonimbus thunderhead clouds of hot rock welling up from deep in the mantle, possibly the outer core/mantle interface. In Hawaii it breaks thru the thin oceanic crust but here, in these 2 warm pools of water, it may not be strong enough to break thru but spread under the crust like that thunderhead.
Easily checked though : measure heat flows directly under these 2 ocean pools of warm water, all the way down to the ocean floor. It is only 2 things, either geothermal or a solar heating gyre that forms in much the same way as the great red spot on jupiter, or the sargasso sea gyre.
Interesting point though, el nino COULD be caused by geothermal diapurs...go LOOK.
But it's amazing what a little common sense, applied to some basic information, can accomplish. It was the awareness of the hotspot forming the Hawaiian Islands that led me this conclusion, plus observation of lava lamps, lol.
I am not familiar with the term diapur, but I am going to investigate this, particularly the information about the area south of the Hawaiian chain.
Thanks.