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Night Spins

In the middle of a summer night, researchers working from the research vessel Oceanus deploy a sampling sled to detect chemical tracers that helped them track how an eddy mixes water layers of the ocean. Eddies are the oceanic equivalent of a hurricane a huge mass of water spinning like a whirlpool, moving through the ocean for months, stretching across tens to hundreds of miles, and stirring up a vortex of water and material from the depths to the surface. (Photo by David Ciochetto, Dalhousie University)