Angert et al. (2002)
Also: Angert et al. 2002
CO2 seasonality indicates origins of post-Pinatubo sink
Angert, A., Biraud, S., Bonfils, C., Buermann, W. & Fung, I. (2002). CO2seasonality indicates origins of post-Pinatubo sink. Journal of Geophysical Research. 31(11),-. PDF
https://doi.org/10.1029/2001jd000455
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.