Feulner et al. (2013)
Also: Feulner et al. 2013
On the Origin of the Surface Air Temperature Difference between the Hemispheres in Earth's Present-Day Climate
Feulner, G., Rahmstorf, S., Levermann, A., & Volkwardt, S. (2013). On the Origin of the Surface Air Temperature Difference between the Hemispheres in Earth's Present-Day Climate. Journal of Climate, 26(18), 7136-7150. Link to PDF
DOI: 10.1175/JCLI-D-12-00636.1
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.