An international programme that began in 2000 to monitor temperature, salinity, currents, and biological properties of the world’s oceans through more than 3900 floats which drift with the currents and are now distributed throughout all oceans. They are parked 1 km below the surface. Every 10 days, by altering their buoyancy, they sink to 2 km then rise to the surface to transmit the data their instruments have acquired.

www.argo.net Argo Programme home page.