The Effect of Obliquity-Driven Changes on Paleoclimate Sensitivity During the Late Pleistocene

Peter Köhler*, Gregor Knorr, Lennert B. Stap, Andrey Ganopolski, Bas de Boer, Roderik S.W. van de Wal, Stephen Barker, Lars H. Rüpke

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

We reanalyze existing paleodata of global mean surface temperature ΔTg and radiative forcing ΔR of CO2 and land ice albedo for the last 800,000 years to show that a state-dependency in paleoclimate sensitivity S, as previously suggested, is only found if ΔTg is based on reconstructions, and not when ΔTg is based on model simulations. Furthermore, during times of decreasing obliquity (periods of land ice sheet growth and sea level fall) the multimillennial component of reconstructed ΔTg diverges from CO2, while in simulations both variables vary more synchronously, suggesting that the differences during these times are due to relatively low rates of simulated land ice growth and associated cooling. To produce a reconstruction-based extrapolation of S for the future, we exclude intervals with strong ΔTg-CO2 divergence and find that S is less state-dependent, or even constant state-independent), yielding a mean equilibrium warming of 2–4 K for a doubling of CO2.

Original languageEnglish
Pages (from-to)6661-6671
Number of pages11
JournalGeophysical Research Letters
Volume45
Issue number13
DOIs
Publication statusPublished - 16 Jul 2018

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Keywords

  • climate sensitivity
  • ECS
  • Pleistocene
  • proxies
  • simulation
  • state dependence

Cite this

Köhler, P., Knorr, G., Stap, L. B., Ganopolski, A., de Boer, B., van de Wal, R. S. W., ... Rüpke, L. H. (2018). The Effect of Obliquity-Driven Changes on Paleoclimate Sensitivity During the Late Pleistocene. Geophysical Research Letters, 45(13), 6661-6671. https://doi.org/10.1029/2018GL077717