The ratio of the volumetric heat capacity of water to that of air is approximately 4000, I think. The ratio of the volume of atmosphere to the volume of ocean is around 3. That means that the heat energy contained in the oceans would be approximately 1300 times the heat capacity of the atmosphere.
Only somebody entirely ignorant of physics would attempt to predict the future temperature of the earth's atmosphere without considering whether the ocean is capable of increasing or decreasing the heat in the atmosphere.
For some reason I’m not into finding the exact info, but it is available; I’ve seen it calculated. I think the heating potential of the oceans is something like 400 times that of the atmosphere.