World Ocean Circulation Experiment (WOCE)

The World Ocean Circulation Experiment (WOCE) was the international field program of 1990 to 1998 that produced the first global, full-depth, high-accuracy hydrographic and tracer survey of the ocean. Coordinated under the World Climate Research Programme, it ran a global grid of one-time and repeat CTD sections measuring temperature, salinity, oxygen, nutrients, and transient tracers (CFCs, tritium, helium), alongside floats, drifters, and the first global TOPEX/Poseidon altimeter mission. WOCE quantified the meridional overturning and water-mass structure and set the data-quality protocols that GO-SHIP, Argo, and the World Ocean Database still follow. Its hydrographic atlas remains a reference for the ocean interior.