Pekka Pirilä – a very clear and useful contribution. The only thing I would add is that as you say, all things being equal, the rise in ocean temperature can be expected to produce a small rise in CO2 before Henry’s law puts a halt to it. However all things are not equal as anthropogenic emissions have increased atmospheric CO2 levels, which means that Henry’s law had already been put into action increasing the solubility of CO2 in the oceans, so at no point did the oceans become a net source of CO2 into the atmosphere. So in fact the oceans have not increased the amount of CO2 in the atmosphere, they have consistently been acting to decrease it.
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