Figure 57. The methodology of greenhouse modelling.
The validity of the climate model is first established by comparison of
its simulation of the present-day (1 x CO2) climate against the observed
climate. The climate sensitivity of the model is then established by determining
the difference in the global mean temperatures simulated by the model under
present-day and under double present-day concentrations of carbon dioxide.
Lastly the climate response of the coupled concentrations of a ‘transient’
experiment) is determined.
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