Stouffer et al. (1989)
Also: Stouffer et al. 1989
Interhemispheric asymmetry in climate response to a gradual increase of atmospheric C02
Stouffer, R. J., Manabe, S., & Bryan, K. (1989). Interhemispheric asymmetry in climate response to a gradual increase of atmospheric C02. Nature, 342, 660-662. Link to PDF
DOI: 10.1038/342660a0
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.