I believe is is more a matter of limited capability within the Oceans to absorb excessive CO2, not that they will release stored Carbon from the depths (though technically they do so continuously). The biosphere that converts CO2 (microorganisms primarily) into energy or waste products,may become incapable of keeping up with a dramatic rise in emissions, which simply means the CO2 has nowhere to go, this may seem like an oceanic release but is actually a mere limitation on the system.
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