1. IPCC AR4 WG1.: IPCC Fourth Assessment Report: Climate Change 2007: The Physical Science Basis. Solomon, S., Qin, D., Manning, M., Chen, Z., Marquis, M., Averyt, K.B., Tignor, M., and Miller, H.L., ed. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Cambridge University Press (2007)
2. IPCC AR4 WG2.: IPCC Fourth Assessment Report: Climate Change 2007: Impacts, Adaptation and Vulnerability. Parry, M.L., Canziani, O.F., Palutikof, J.P., van der Linden, P.J., and Hanson, C.E., ed. Contribution of Working Group II to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Cambridge University Press (2007)
3. WMO.:
http://www.wmo.int/pages/prog/gcos/index.php?name=EssentialClimateVariables
. Accessed 12 Aug 2013
4. CEOS.:
http://www.eohandbook.com/eohb2011/climate_variables.html
. Accessed 12 Aug 2013
5. WMO.: Implementation Plan for the Global Observing System for Climate in Support of the UNFCCC (2004)