Emmert et al. (2004)
Also: Emmert et al. 2004
Global change in the thermosphere: Compelling evidence of a secular decrease in density
Emmert, J. T., Picone, J. M., Lean, J. L., & Knowles, S. H. (2004). Global change in the thermosphere: Compelling evidence of a secular decrease in density. Journal of Geophysical Research: Space Physics (19782012), 109(A2). Link to PDF
DOI: 10.1029/2003JA010176
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.