Taking the Ocean's Temperature

Learn how scientists measure the ocean's temperature at more than 3,000 locations worldwide, using a fleet of underwater "floats" called ARGO. At each spot, a float descends to about 2,000 meters below the ocean surface and back up again, measuring temperature, pressure, and salinity along the way. Scientists use the data to create ocean temperature maps; data gathered annually shows how ocean temperature changes over time and helps us better understand climate.

Video from NOAA and the Smithsonian Institution.