re: "Cold ocean absorbs CO2 and warm oceans release CO2. "- Yet the ocean acidity is INCREASING due to increased CO2....
Answer a simple question.
Has the oceans warmed in the last 10,000 years.
Do oceans which warm release CO2 or absorb CO2.
In addition you do realize that coastal waters are an insignificant portion of the Ocean. That ocean waters are "acidified" by the purest water that can be made. That rain will acidify sea water- and particularly in regards to shallow coastal areas.
Therefore a natural river is acidifying the coastal waters, and where a river water flows, after they enter coastal water can be fairly chaotic- meaning they flow in one direction for years and change direction to flow in different directions due to many different reasons.