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  The effect of obliquity-driven changes on Paleoclimate sensitivity during the late Pleistocene

Köhler, P., Knorr, G., Stap, L. B., Ganopolski, A., Boer, B. d., Wal, R. S. W. v. d., Barker, S., 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

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 Creators:
Köhler, P.1, Author
Knorr, G.1, Author
Stap, L. B.1, Author
Ganopolski, Andrey2, Author              
Boer, B. de1, Author
Wal, R. S. W. van de1, Author
Barker, S.1, Author
Rüpke, L. H.1, Author
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1External Organizations, ou_persistent22              
2Potsdam Institute for Climate Impact Research, ou_persistent13              

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 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.

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 Dates: 2018
 Publication Status: Finally published
 Pages: -
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 Rev. Type: Peer
 Identifiers: DOI: 10.1029/2018GL077717
PIKDOMAIN: Earth System Analysis - Research Domain I
eDoc: 8421
Research topic keyword: Paleoclimate
Model / method: CLIMBER
Regional keyword: Global
Organisational keyword: RD1 - Earth System Analysis
Working Group: Long-Term Dynamics of the Earth System
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Title: Geophysical Research Letters
Source Genre: Journal, SCI, Scopus, p3
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Pages: - Volume / Issue: 45 (13) Sequence Number: - Start / End Page: 6661 - 6671 Identifier: CoNE: https://publications.pik-potsdam.de/cone/journals/resource/journals182