Technical Note: Calculating state dependent equilibrium climate sensitivity from palaeodata
- 1Alfred-Wegener-Institut Helmholtz-Zentrum für Polar-und Meeresforschung (AWI), P.O. Box 12 01 61, 27515 Bremerhaven, Germany
- 2Institute for Marine and Atmospheric research Utrecht (IMAU), Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands
- 3School of Earth and Environment, University of Leeds, Leeds, UK
- 1Alfred-Wegener-Institut Helmholtz-Zentrum für Polar-und Meeresforschung (AWI), P.O. Box 12 01 61, 27515 Bremerhaven, Germany
- 2Institute for Marine and Atmospheric research Utrecht (IMAU), Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands
- 3School of Earth and Environment, University of Leeds, Leeds, UK
Abstract. The evidence from both data and models indicate that specific equilibrium climate sensitivity S[X] – the global annual mean surface temperature change (∆Tg) 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 ∆Tg 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.
Peter Köhler et al.


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RC1: 'Review of "Calculating state dependent equilibrium climate sensitivity from palaeodata" by Köhler et al.', Anonymous Referee #1, 19 Apr 2016
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AC1: 'Rebuttal to reviewer #1', Peter Köhler, 18 May 2016
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AC1: 'Rebuttal to reviewer #1', Peter Köhler, 18 May 2016
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RC2: 'Review of "Technical Note: Calculating state dependent equilibrium climate sensitivity from palaeodata", Köhler et al.', Jonah Bloch-Johnson, 27 Apr 2016
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AC4: 'Reply', Peter Köhler, 18 May 2016
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AC4: 'Reply', Peter Köhler, 18 May 2016
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RC3: 'Brief postscript on transient vs. equilibrium climate sensitivity', Anonymous Referee #2, 28 Apr 2016
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AC3: 'Rebuttal to reviewer #2', Peter Köhler, 18 May 2016
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AC3: 'Rebuttal to reviewer #2', Peter Köhler, 18 May 2016
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RC4: 'review', Anonymous Referee #3, 02 May 2016
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AC2: 'Rebuttal to reviewer #3', Peter Köhler, 18 May 2016
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AC2: 'Rebuttal to reviewer #3', Peter Köhler, 18 May 2016


-
RC1: 'Review of "Calculating state dependent equilibrium climate sensitivity from palaeodata" by Köhler et al.', Anonymous Referee #1, 19 Apr 2016
-
AC1: 'Rebuttal to reviewer #1', Peter Köhler, 18 May 2016
-
AC1: 'Rebuttal to reviewer #1', Peter Köhler, 18 May 2016
-
RC2: 'Review of "Technical Note: Calculating state dependent equilibrium climate sensitivity from palaeodata", Köhler et al.', Jonah Bloch-Johnson, 27 Apr 2016
-
AC4: 'Reply', Peter Köhler, 18 May 2016
-
AC4: 'Reply', Peter Köhler, 18 May 2016
-
RC3: 'Brief postscript on transient vs. equilibrium climate sensitivity', Anonymous Referee #2, 28 Apr 2016
-
AC3: 'Rebuttal to reviewer #2', Peter Köhler, 18 May 2016
-
AC3: 'Rebuttal to reviewer #2', Peter Köhler, 18 May 2016
-
RC4: 'review', Anonymous Referee #3, 02 May 2016
-
AC2: 'Rebuttal to reviewer #3', Peter Köhler, 18 May 2016
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AC2: 'Rebuttal to reviewer #3', Peter Köhler, 18 May 2016
Peter Köhler et al.
Peter Köhler et al.
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