Donat & Alexander (2012)
Also: Donat & Alexander 2012
The shifting probability distribution of global daytime and night-time temperatures
Donat, M.G., Alexander, L.V. (2012). The shifting probability distribution of global daytime and night-time temperatures. Geophysical Research Letters. 39(14),-. PDF
https://doi.org/10.1029/2012gl052459
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.