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  • From: Paul Cereghino <paul.cereghino@comcast.net>
  • To: permaculture <permaculture@lists.ibiblio.org>
  • Subject: [permaculture] Ocean acidity
  • Date: Tue, 18 Dec 2007 20:08:58 -0800

Don't usually like to spread gloom....

http://www.theolympian.com/news/story/301294.html

<Clip>

But they now know that the fundamental chemistry of the oceans has changed, and the possible effects seem to grow more nightmarish as research accelerates.

"It seems like it is a one-way street, and that is alarming," said Steven Emerson, a professor of oceanography at the University of Washington. "The pH of the oceans could be lowered permanently."

Emerson was the lead scientist on the team that built the buoy at Ocean Station Papa, where weather measurements have been taken since the 1940s. The 10-foot-diameter buoy is equipped with an array of sensors that, among other things, measure the amount of carbon dioxide that's being absorbed by the North Pacific and the pH, or acid levels, of the ocean. Anchored in water 5,000 feet deep, the buoy relays its information to onshore scientists via satellite.

The increasing acidity can eat away at the shells of crabs, oysters, clams and nearly microscopic organisms known as krill and pteropods. It also inhibits calcification, the process in which these animals rebuild their shells. Without shells, most of the animals probably would die.

Krill and pteropods are a major food source for juvenile salmon, herring, pollock, cod, mackerel and other fish.

"When you start messing with the lower end of the food chain, it can dramatically affect the higher end of the food chain," Feely said.






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