Articles | Volume 11, issue 12
Clim. Past, 11, 1801–1823, 2015
https://doi.org/10.5194/cp-11-1801-2015
Clim. Past, 11, 1801–1823, 2015
https://doi.org/10.5194/cp-11-1801-2015

Research article 21 Dec 2015

Research article | 21 Dec 2015

On the state dependency of the equilibrium climate sensitivity during the last 5 million years

P. Köhler et al.

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Cited articles

Abe-Ouchi, A., Segawa, T., and Saito, F.: Climatic Conditions for modelling the Northern Hemisphere ice sheets throughout the ice age cycle, Clim. Past, 3, 423–438, https://doi.org/10.5194/cp-3-423-2007, 2007.
Ahn, J. and Brook, E. J.: Siple Dome ice reveals two modes of millennial CO2 change during the last ice age, Nature Communications, 5, 3723, https://doi.org/10.1038/ncomms4723, 2014.
Allen, K. A., Hönisch, B., Eggins, S. M., and Rosenthal, Y.: Environmental controls on B/Ca in calcite tests of the tropical planktic foraminifer species Globigerinoides ruber and Globigerinoides sacculifer, Earth Planet. Sc. Lett., 351–352, 270–280, https://doi.org/10.1016/j.epsl.2012.07.004, 2012.
Annan, J. D. and Hargreaves, J. C.: A new global reconstruction of temperature changes at the Last Glacial Maximum, Clim. Past, 9, 367–376, https://doi.org/10.5194/cp-9-367-2013, 2013.
Badger, M. P. S., Schmidt, D. N., Mackensen, A., and Pancost, R. D.: High-resolution alkenone palaeobarometry indicates relatively stable pCO2 during the Pliocene (3.3–2.8 Ma), Philos. T. R. Soc. A, 371, https://doi.org/10.1098/rsta.2013.0094, 2013.
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Short summary
We find that the specific equilibrium climate sensitivity due to radiative forcing of CO2 and land ice albedo has been state-dependent for the last 2.1Myr (most of the Pleistocene). Its value is ~45% larger during intermediate glaciated climates and interglacial periods than during Pleistocene full glacial conditions. The state dependency is mainly caused by a latitudinal dependency in ice sheet area changes. Due to uncertainties in CO2, firm conclusions for the Pliocene are not yet possible.