Technical Note: Calculating state dependent equilibrium climate sensitivity from palaeodata
2016
Abstract. The evidence from both data and models indicate that specific equilibrium climate sensitivity S [X] – the global annual mean surface temperature change (∆ T g ) as a response to a change in radiative forcing X (∆ R [X] ) – is state dependent. Such a state dependency implies that the best fit in the scatter plot of ∆ T g versus ∆ R [X] is not a linear regression, but for instance a higher order polynomial. While for the conventional linear case the slope (gradient) of the regression is correctly interpreted as the specific equilibrium climate sensitivity S [X] , the interpretation is not straightforward in the non-linear case. We here elaborate how such a state dependent scatter plot needs to be interpreted, and provide a theoretical understanding how to calculate S [X] in the non-linear case.
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