Contact: Burke Hales
bhales
atcoas.oregonstate.edu
541-737-8121 / Oregon State University
http://www.sciencedaily.com/releases/2008/05/080522181511.htmU.S. Pacific Coast Waters Turning More AcidicScienceDaily (May 23, 2008) — An international team of scientists surveying the waters of the continental shelf off the West Coast of North America has discovered for the first time high levels of acidified ocean water within 20 miles of the shoreline, raising concern for marine ecosystems from Canada to Mexico.
"When the upwelled water was last at the surface, it was exposed to an atmosphere with much lower CO2 (carbon dioxide) levels than today's," pointed out Burke Hales, an associate professor in the College of Oceanic and Atmospheric Sciences at Oregon State University and an author on the Science study. "The water
that will upwell off the coast in future years already is making its undersea trek toward us, with ever-increasing levels of carbon dioxide and acidity.
Scientists have become increasingly concerned about ocean acidification in recent years, as the world's oceans absorb growing levels of carbon dioxide from the atmosphere. When that CO2 mixes into the ocean water, it forms carbonic acid that has a corrosive effect on aragonite -- the calcium carbonate mineral that forms the shells of many marine creatures.
The research team used OSU's R/V Wecoma to sample water off the coast from British Columbia to Mexico. The researchers found that
the 50-year-old upwelled water had CO2 levels of 900 to 1,000 parts per million, making it "right on the edge of solubility" for calcium carbonate-shelled aragonites, Hales said.
"The coastal ocean acidification train has left the station," Hales added, "and there not much we can do to derail it."
...Debbie Downer strikes again. ...mmwwaaa, mwaaaa.