Smith et al. (2008)
Also: Smith et al. 2008
Improvements to NOAA's historical merged land-ocean surface temperature analysis (1880-2006)
Smith, T. M., Reynolds, R. W., Peterson, T. C., & Lawrimore, J. (2008). Improvements to NOAA's historical merged land-ocean surface temperature analysis (1880-2006). Journal of Climate, 21(10), 2283-2296. Link to PDF
DOI: 10.1175/2007JCLI2100.1
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.