The point being Canuck, as you well know, is that the ocean temperatures that will have any significance during the next hundred years are not in the sub-thermocline, they are in the top hundred metres. Knowing this, one wonders why you never bothered to raise the issue of 'whole ocean' versus the upper 'subset' as you call it. Sure you 'could go finer' than me, but 'finer' is irrelevant in this case.

"Time is what prevents everything from happening at once" - John Wheeler