The recent Eos article by Sun et al. [2004] described unusually chilly ocean conditions along the U.S. mid-Atlantic coast in summer 2003 that the authors attributed to stronger than usual upwelling. The stress of alongshore (northward on the North American east coast) wind on the ocean's surface, in concert with Earth's rotation, causes surface water to move offshore and be replaced by water that upwells along the coast from depths of 50–100 m and more. Upwelled water is cooler and more saline than the original surface water, and typically has much greater concentrations of nutrients that are key to sustaining biological production [Smith, 1968].Coastal upwelling is principally considered a west coast process, but it can play an important role in the physics, chemistry, and ecology of the broad continental shelves of east coasts.