Before revision: 100px |right 600px|The distribution of active floats in the Argo array, colour coded by country that owns the float, as of February 2018.Argo is an international program that uses profiling floats to observe temperature, salinity, currents, and, recently, bio-optical properties in the Earth's oceans; it has been operational since the early 2000s.
After revision: 80px |right 600px|The distribution of active floats in the Argo array, colour coded by country that owns the float, as of February 2018.Argo is an international program that uses profiling floats to observe temperature, salinity, currents, and, recently, bio-optical properties in the Earth's oceans; it has been operational since the early 2000s.