In reply to H LV's message of Sun, 13 Sep 2020 22:23:13 -0400: Hi Harry, [snip] >As I scan Zoe's various posts and her responses to her critics it seems she >insists that heat and radiation are related but also maintains that they >are not equivalent or convertible. She maintains that a body can shine >alone, but it will only shed heat as well if a relatively cooler body is >nearby which can receive it. >harry Radiation has nothing to do with it at all. If the heat source is the mantel, then the source is the mid-Atlantic ridge where the crust is quite thin, and ocean water is readily heated resulting in hot plumes, that are well known to exist and bring dissolved minerals up to the ocean bottom. This is conduction & convection. Nothing to do with radiation.
I don't know whether or not anyone has taken the trouble to calculate the amount of heat thus added to the ocean. BTW the web site you quoted used an erroneous value for the volume of the ocean AFAIK. It was too small by a factor of thousands.