2010-04-23 08:25:05
By RANDOLPH E. SCHMID, AP Science Writer Randolph E. Schmid, Ap Science Writer
Thu Apr 22, 1:33 pm ET
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.