ocean acidification definition
DEFINITION OF OCEAN ACIDIFICATION. Ocean Acidification (OA) is a term used to describe significant changes to the chemistry of the ocean. It occurs when carbon dioxide gas (or CO 2) is absorbed by the ocean and reacts with seawater to produce acid.EFINITION OF OCEAN ACIDIFICATION. Ocean Acidification (OA) is a term used to describe significant changes to the chemistry of the ocean. It occurs when carbon dioxide gas (or CO 2) is absorbed by the ocean and reacts with seawater to produce acid.