Au contraire, we know that the ocean is adsorbing, not desorbing, CO2 because of the declining ocean pH, see https://www.epa.gov/climate-indicators/climate-change-indicators-ocean-acidity  that notes 
"- Measurements made over the last few decades have demonstrated that ocean carbon dioxide levels have risen in response to increased carbon dioxide in the atmosphere, leading to an increase in acidity (that is, a decrease in pH).
- Historical modeling suggests that since the 1880s, increased carbon dioxide has led to lower aragonite saturation levels in the oceans around the world, which makes it more difficult for certain organisms to build and maintain their skeletons and shells (see Figure 2)."

Re your comment "We may have to wait a few decades to see how this whole scenario plays out. Nature will not be rushed."  That's like saying that your grandchild needs to wait a few years to see how his cancerous growth plays out.  We can only prevent, not reverse, accelerated warming.