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Climate of the Past An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/cp-2020-59
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-2020-59
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  28 Apr 2020

28 Apr 2020

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This discussion paper is a preprint. It has been under review for the journal Climate of the Past (CP). The manuscript was not accepted for further review after discussion.

Technical note: Pleistocene climate sensitivity to CO2 forcing is path dependent in reconstructions

Roger M. Cooke1 and Willy P. Aspinall2 Roger M. Cooke and Willy P. Aspinall
  • 1Resources for the Future, Washington DC, 200036 USA
  • 2School of Earth Sciences, University of Bristol, Bristol, UK

Abstract. Improved high-resolution paleo records of atmospheric carbon dioxide (CO2) concentrations and reconstructions of Earth’s surface temperature are available. We analyse one authoritative Pleistocene dataset to explore how the climate sensitivity parameter S varies under different system states, using linear regression of mean annual surface temperature changes against CO2 forcing changes. Data are partitioned by path (deglaciation or glaciation). On the whole data set, S = 2.04 K/Wm−2 and CO2 forcing explains 64 % of the variance in temperature. During deglaciation periods, S = 2.34 K/Wm−2, explaining 75 % of the temperature variance; during glaciations, S = 1.59 K/Wm−2 and explains 48 % of the temperature variance. Possible process-related explanations are conjectured.

Roger M. Cooke and Willy P. Aspinall

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AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Roger M. Cooke and Willy P. Aspinall

Roger M. Cooke and Willy P. Aspinall

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Short summary
The climate sensitivity parameter S varies under different system states, using linear regression of mean annual surface temperature changes against CO2 forcing changes. Pleistocene data are partitioned by path (deglaciation or glaciation). On the whole data set, S = 2.04 K/Wm−2 and CO2 forcing explains 64 % of the temperature variance. During deglaciation periods, S = 2.34 K/Wm−2, explaining 75 % of the temperature variance; during glaciations, S = 1.59 K/Wm−2 and explains 48 % of the variance.
The climate sensitivity parameter S varies under different system states, using linear...
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