The jury’s still out, but scientists are beginning to get a clearer idea. These past few years have been “incredibly weird” in the northeast Pacific, says Nate Mantua, a research scientist at the National Oceanic and Atmospheric Administration’s Southwest Fisheries Science Center in Santa Cruz. He points to the same “ridiculously resilient ridge” of high pressure that’s been causing the historic drought in the western United States: This pressure also resulted in a pool of exceptionally warm water in the Pacific (known as “the blob”), with little weather to disperse it. Those conditions, along with prevailing winds and colder currents that ferry nutrients back to the coast, seem to be supplying the algae with a seemingly endless feast.
That makes the source of this bloom different from its cousin in the Gulf of Mexico, where fertilizers flowing from as far as Iowa are feeding a zone of algae that’s as large as New Jersey. “We’re seeing them in relatively pristine waters of the US West Coast,” Trainer explains, though she adds runoff and sewage discharge may be playing some role in the blooms off Southern California. ∞∞∞∞∞ MORE »»»»