A review of all available ocean data records concludes that the low-oxygen events which have plagued the Pacific Northwest coast since 2002 are unprecedented in the five decades prior to that, and may well be linked to the stronger, persistent winds that are expected to occur with global warming.

In a new study in the journal Science, researchers from Oregon State University outline a "potential for rapid reorganization" in basic marine ecosystems and the climatic forces that drive them, and suggest that these low-oxygen, or "hypoxic" events are now more likely to be the rule rather than the exception.

"In this part of the marine environment, we may have crossed a tipping point," said Jane Lubchenco, the Wayne and Gladys Valley Professor of Marine Biology at OSU, and the lead scientist for PISCO, the Partnership for Interdisciplinary Studies of Coastal Oceans.

"Levels of oxygen in the summertime have suddenly become much lower than levels in the previous 50 years," Lubchenco said. "And 2006 broke all records, with parts of the shallow shelf actually becoming anoxic, meaning that they lacked oxygen altogether. We've never seen that before."

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