Scientists launch the CTD rosette that will take water samples and measure conductivity (or salinity), temperature, and depth.

Scientists launch the CTD rosette that will take water samples and measure conductivity (or salinity), temperature, and depth. Scientists use these samples to calibrate the oxygen and salinity sensors and to measure for petroleum products, plankton, and bacteria. Image credit: Keeley Belva, NOAA Office of Ocean Exploration and Research.

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