WOCE
World Ocean Circulation Experiment (WOCE)
The 1990-2002 WOCE project used buoyancy-neutral ALACE floats to follow deep ocean currents, with later upgrades to measure temperature and salinity of water columns when surfacing.
All IPCC definitions taken from Climate Change 2007: The Physical Science Basis. Working Group I Contribution to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Annex I, Glossary, pp. 941-954. Cambridge University Press.