Articles | Volume 18, issue 4
https://doi.org/10.5194/cp-18-657-2022
https://doi.org/10.5194/cp-18-657-2022
Research article
 | 
06 Apr 2022
Research article |  | 06 Apr 2022

Warm mid-Pliocene conditions without high climate sensitivity: the CCSM4-Utrecht (CESM 1.0.5) contribution to the PlioMIP2

Michiel L. J. Baatsen, Anna S. von der Heydt, Michael A. Kliphuis, Arthur M. Oldeman, and Julia E. Weiffenbach

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Cited articles

Baatsen, M., von der Heydt, A. S., Huber, M., Kliphuis, M. A., Bijl, P. K., Sluijs, A., and Dijkstra, H. A.: The middle to late Eocene greenhouse climate modelled using the CESM 1.0.5, Clim. Past, 16, 2573–2597, https://doi.org/10.5194/cp-16-2573-2020, 2020. a, b, c, d, e, f, g
Bellucci, A., Gualdi, S., and Navarra, A.: The double-ITCZ syndrome in coupled general circulation models: The role of large-scale vertical circulation regimes, J. Clim., 23, 1127–1145, https://doi.org/10.1175/2009JCLI3002.1, 2010. a
Bitz, C. M., Shell, K. M., Gent, P. R., Bailey, D. A., Danabasoglu, G., Armour, K. C., Holland, M. M., and Kiehl, J. T.: Climate sensitivity of the community climate system model, version 4, J. Clim., 25, 3053–3070, https://doi.org/10.1175/JCLI-D-11-00290.1, 2012. a
Blackmon, M., Boville, B., Bryan, F., Dickinson, R., Gent, P., Kiehl, J., Moritz, R., Randall, D., Shukla, J., Solomon, S., Bonan, G., Doney, S., Fung, I., Hack, J., Hunke, E., Hurrell, J., Kutzbach, J., Meehl, J., Otto-Bliesner, B., Saravanan, R., Schneider, E. K., Sloan, L., Spall, M., Taylor, K., Tribbia, J., and Washington, W.: The Community Climate System Model, B. Am. Meteorol. Soc., 82, 2357–2376, https://doi.org/10.1175/1520-0477(2001)082<2357:TCCSM>2.3.CO;2, 2001. a
Bloch-Johnson, J., Pierrehumbert, R. T., and Abbot, D. S.: Feedback temperature dependence determines the risk of high warming, Geophys. Res. Lett., 42, 4973–4980, https://doi.org/10.1002/2015GL064240, 2015. a
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Short summary
The Pliocene was a period during which atmospheric CO2 was similar to today (i.e. ~ 400 ppm). We present the results of model simulations carried out within the Pliocene Model Intercomparison Project Phase 2 (PlioMIP2) using the CESM 1.0.5. We find a climate that is much warmer than today, with augmented polar warming, increased precipitation, and strongly reduced sea ice cover. In addition, several leading modes of variability in temperature show an altered behaviour.