How do oceans absorb CO2?

1. The ocean can absorb carbon dioxide through diffusion from the atmosphere and through photosynthesis in plankton and algae. 2. Carbon dioxide moves between the atmosphere and the ocean by molecular diffusion. 3. The solubility of carbon dioxide varies based on salinity and temperature of the water and there is a finite amount that the water can absorb. 4. The colder the water, the more carbon dioxide can be dissolved. 5. Phytoplankton and algae both photosynthesize in the ocean and consume carbon dioxide using sunlight and release oxygen.