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Undersea device stands ready to catch an eddy.(Submerged Autonomous Launch Platforms)

[ILLUSTRATION OMITTED]

Amy Bower wanted to investigate an elusive and unpredictable phenomenon in a remote ocean. Off the west coast of Greenland, large, spinning rings of warm water, called eddies, occasionally form in the ocean, like dust devils in the wind, and drift intact for years in the cold Labrador Sea.

"These eddies are small cogs in a big turning wheel," Bower said. Still, "cogs" are important to understand when the big turning wheel is the ocean's global circulation, which distributes heat around the planet and helps regulate Earth's climate. But how can you know exactly when and where an eddy will form, and how can you track it through a forbidding part ...

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