This is simply not true. The specific heat capacity of liquid water varies a fraction of a percent until it changes state. That is the actual metric of how much heat any matter can absorb as it rises by a unit of temperature.
Unless the oceans are literally boiling, the ocean will continue to function as an effective thermal buffer and they will not “reach their limits” in moderating atmospheric temperatures lol.
You are quite right, I should have clarified my thoughts more . As the surface temp rises, there is a fall in the overall energy oceans take in over time, as more of this energy can be returned to the atmosphere by evaporation, heating the prevailing winds, etc
Plus I'm not upto date, probably lots of pluses and minuses, with flow of heat from surface to lower currents .
I was just parroting the known fact, that the ocean has been buffering a lot of the heat, and I had read years ago, it's buffering effect has been decreasing.
No idea what latest models say, probably quite complex and need to measure lots of data points in all currents deep and at surface
Definitely the surface temps is a major factor to the weather day to day, Here in NZ our temps are ocean moderated, but if particular warm India ocean current comes our way - we will notice as affects rain and temps .
Was it 2 years ago the high air streams had huge variations in the Northern Hemisphere, So interesting times , Even variation in prevailing winds near surface have a huge weather effect . Eg we can have very cold summer days if southerlies off Antarctic waters , Northern hemisphere can get similar , So ignoring long term climate change, we will also see some changes in local weather if currents heat/cool or flow differently deeper, swallower, slower faster tec