New study says oceans' chemistry changing rapidly

http://news.yahoo.com/s/ap/us_sci_acid_oceans;_ylt=Aqu4oqubGTNnZaBr4ufjvtSs0NUE;_ylu=X3oDMTFpMTAwa2c5BHBvcwMzNwRzZWMDYWNjb3JkaW9uX21vc3RfcG9wdWxhcgRzbGsDbmV3c3R1ZHlzYXlz

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.

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