Not too long ago we reported that the oceans are farting out a lot of methane. Today’s special Earth Day report confirms that the chemical makeup of the world’s oceans is changing – fast – because of increased CO2 absorption from the atmosphere.
The pH of the oceans is declining, i.e. our seas are growing more acidic. In fact, since the Industrial Revolution to today, the rate of increasing acidity is greater than at any time in the last 800,000 years. And that’s really bad news for coral, and for photosynthesis.
The full story in the AP is located below the fold, since the story comes to me over Yahoo!’s network, and it destroys links after a certain time.
WASHINGTON – The chemistry of the oceans is changing faster than it has in hundreds of thousands of years because of the carbon dioxide being absorbed from the atmosphere, the National Research Council reported Thursday.
Carbon dioxide and other industrial gases have been a concern for several years because of their impact on the air, raising global temperatures in a process called the greenhouse effect.
One factor easing that warmth has been the amount of CO2 taken up by the oceans, but that has also caused scientific concerns because the chemicals make the water more acidic, which can affect sea life.
Since the beginning of the Industrial Revolution in the 18th century, the pH of ocean water has declined from 8.2 to 8.1 and a further decline of 0.2 to 0.3 units is expected by the end of this century, according to the Research Council, an arm of the National Academy of Science.
The current rate of change “exceeds any known change in ocean chemistry for at least 800,000 years,” the report said.
As most folks will remember from school chemistry, pH is a measure of how alkaline or acidic something is. A pH of 7 is neutral, while higher numbers are more alkaline and lower numbers are more acidic.
As the ocean becomes more acidic scientists have raised concern about dissolving coral reefs and potential effects on fish and other sea life.
For example, studies have shown that increasing seawater acidity affects photosynthesis, nutrient acquisition, growth, reproduction and individual survival of certain sea life.
The Environmental Protection Agency said in March it will consider ways states can address rising acidity levels in the oceans.
The agency’s decision was announced in a legal settlement with the Center for Biological Diversity. The environmental group sued the EPA last year for not requiring Washington state to list its coastal waters as impaired by rising acidity under the Clean Water Act.
The report noted that the federal government has taken initial steps with the development of the National Ocean Acidification Program.
It made the following recommendations:
• Create an ocean acidification observation network including new tools, methods and techniques to improve measurements.
• Research to fill critical information gaps.
• Set up a data management office to ensure data quality, access and archiving to assist managers, policymakers and the general public.
• Develop high-quality research and training of ocean acidification researchers.
• Set up an effective 10-year strategic plan for the program that will identify key goals, set priorities and allow for community input.