Zeebe et al. (2014)
Also: Zeebe et al. 2014
Onset of carbon isotope excursion at the Paleocene-Eocene thermal maximum took millennia, not 13 years
Zeebe, R. E., Dickens, G. R., Ridgwell, A., Sluijs, A., & Thomas, E. (2014). Onset of carbon isotope excursion at the Paleocene-Eocene thermal maximum took millennia, not 13 years. Proceedings of the National Academy of Sciences, 111(12), E1062-E1063. Link to paper
doi: 10.1073/pnas.1321177111
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.