CHRIS LINDER, VISUALS UNLIMITED / SCIENCE PHOTO LIBRARY CHRIS LINDER, VISUALS UNLIMITED / SCIENCE PHOTO LIBRARY
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Water transparency measurement. Researcher using a secchi disk to measure water transparency, which is related to water turbidity. Photographed on a river in Russia's Sakha Republic (Yakutia), in the Siberian Arctic. This work is part of the Polaris Project, where scientists are trained in methods of Arctic research.
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