Smith & Murphy (2007)
Also: Smith & Murphy 2007
An objective ocean temperature and salinity analysis using covariances from a global climate model
Smith, D.M., Murphy, J.M. (2007). An objective ocean temperature and salinity analysis using covariances from a global climate model. Journal of Geophysical Research: Oceans. 112(C2). PDF
https://doi.org/10.1029/2005jc003172
References
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.