The ocean very slowly absorbs CO2 from the atmosphere. Simultaneously, it ‘off gases’ carbon dioxide into the atmosphere. The warmer the water, the more is the ‘off gassing’ and the less it is like a sponge for CO2, because warmer water cannot hold as much carbon dioxide. As carbon dioxide, methane and other greenhouse gas levels increase in the atmosphere, the entire biosphere becomes warmer — thus; the oceans will absorb CO2 at a slower rate and ‘off gas’ at a higher rate; permafrost will melt faster and yield ever increasing amounts of methane; and, ocean ice will reflect less and less radiant energy; etcetera.
Ocean’s Carbon Balance:
https://earthobservatory.nasa.gov/features/OceanCarbon
Changes in Carbon Cycle:
https://earthobservatory.nasa.gov/features/CarbonCycle/page4.php
Atmospheric Carbon Dioxide:
https://www.climate.gov/news-features/understanding-climate/climate-change-atmospheric-carbon-dioxide
Search:
‘AGW: Ocean Atmospheric CO2 Cycle’
