Berner & Kothavala (2001)
Also: Berner & Kothavala 2001
GEOCARB III: a revised model of atmospheric CO2 over Phanerozoic time
Berner, R. A., & Kothavala, Z. (2001). GEOCARB III: a revised model of atmospheric CO2 over Phanerozoic time. American Journal of Science, 301(2), 182-204. Link to paper
https://doi.org/10.2475/ajs.301.2.182
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.