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Red Sky at Night

Scientists and crew on board Knorr enjoy a sign of good weather to come while deploying a string of pumps over the side. The pumps filter 1500 liters (400 gallons) over four hours to collect tiny samples of scarce particles in the water column. The team recently completed work in the North Atlantic as part of GEOTRACES, an international study of marine biogeochemical cycles involving trace elements and their isotopes. GEOTRACES aims to understand the factors that govern the movement of these elements through the ocean and their sensitivity to changing environmental conditions. (Photo by Brett Longworth, Woods Hole Oceanographic Institution)