Pope et al. (1994)
Also: Pope et al. 1994
Impact winter and the Cretaceous/Tertiary extinctions: results of a Chicxulub asteroid impact model
Pope, K. O., Baines, K. H., Ocampo, A. C., & Ivanov, B. A. (1994). Impact winter and the Cretaceous/Tertiary extinctions: results of a Chicxulub asteroid impact model. Earth and Planetary Science Letters, 128(3), 719-725. Link to abstract
doi:10.1016/0012-821X(94)90186-4
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.