1. OA definition

Ocean Acidification: The Other Carbon Dioxide Problem

Ocean acidification, or “OA” for short, is the term given to the chemical changes in the ocean as a result of carbon dioxide emissions.


Hawaii Carbon Dioxide Time-Series

Fundamental changes in seawater chemistry are occurring throughout the world’s oceans. Since the beginning of the industrial revolution, the release of carbon dioxide (CO2) from humankind’s industrial and agricultural activities has increased the amount of CO2 in the atmosphere. The ocean absorbs about a quarter of the CO2 we release into the atmosphere every year, so as atmospheric CO2 levels increase, so do the levels in the ocean. Initially, many scientists focused on the benefits of the ocean removing this greenhouse gas from the atmosphere. However, decades of ocean observations now show that there is also a downside — the CO2 absorbed by the ocean is changing the chemistry of the seawater, a process called OCEAN ACIDIFICATION.

SOURCE: http://www.pmel.noaa.gov/co2/story/Ocean+Acidification