“Algae blooms,” she says. “It’s sort of like a swimming pool that hasn’t been cleaned in a while.” The blob, Konar said, is a microalgae made up of “billions and billions of individuals.” “We’ve observed large blooms in the past off Barrow although none of them at all like this,” Barry Sherr, an Oregon State University professor of oceanography, said in an e-mail. “The fact that the locals say they’ve never seen anything like it suggests that it might represent some exotic species which has drifted into the region, perhaps as a result of global change. For the moment that’s just a guess.”
Hat tip to Bioemphemera.