A new study led by the National Oceanic and Atmospheric Administration has found that waters off the coast of California are acidifying twice as fast as the global average.
Scientists looked at nearly 2,000 shells of a microscopic animal called foraminifera. They measured deposits on the shells and determined that over a century dating back to 1895, the waters had a 0.21 decline in pH, more than double the global average of 0.1. When carbon dioxide mixes with seawater, a chemical reaction makes the water more acidic; since the Industrial Revolution, the ocean has absorbed more than a quarter of the carbon dioxide released by humans and roughly 90 percent of the resulting heat, the Los Angeles Times reports.
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Researchers also made an unexpected discovery, finding that the Pacific Decadal Oscillation, a natural warming and cooling cycle, plays a role in ocean acidification, making it better or worse depending on whether its warm or cool. The study was published Monday in the journal Nature Geoscience.
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