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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.
The graphic shows a typical Argo-cycle in which the autonomous floating device descends to a depth of about 1,000m where it drifts with the currents for 8 to 10 days. This drifting is followed by a further descent to a depth of 2,000m and then the float ascends within 6 hours collecting data on temperature and salinity during its rise. Once at the surface, the data is sent to orbiting satellites.