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The amount of CO2 absorbed into the ocean is still going up despite the rise in ocean temperatures. That's why the ocean's pH is dropping (commonly know as "ocean acidification" although the oceans will never actually flip over to being acid.) The concentration of absorbed CO2 in the ocean is affected by two things primarily. Temperature as you already noted but also by the partial pressure of CO2 in the atmosphere. So far the increase in CO2 in the atmosphere is winning.