Geosci. Model Dev. Discuss., 5, 4269-4303, 2012
© Author(s) 2012. This work is distributed
under the Creative Commons Attribution 3.0 License.
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This discussion paper has been under review for the journal Geoscientific Model Development (GMD). Please refer to the corresponding final paper in GMD.
Simulating the mid-Pliocene Warm Period with the CCSM4 model
N. A. Rosenbloom, B. L. Otto-Bliesner, E. C. Brady, and P. J. Lawrence
National Center for Atmospheric Research, 1850 Table Mesa Drive, Boulder, CO 80305, USA

Abstract. This paper describes the experimental design and model results from a 500 yr fully coupled Community Climate System Model (v4) simulation of the mid-Pliocene Warm Period (mPWP) (ca. 3.3 to 3.0 Ma). We simulate the mPWP using the "alternate" protocol prescribed by the Pliocene Model Intercomparison Project (PlioMIP) for the AOGCM simulation (Experiment 2). Results from the CCSM4 mPWP simulation show a 1.9 °C increase in global mean annual temperature compared to the 1850 preindustrial control, with a polar amplification of ~ 3 times the global warming. Global precipitation increases slightly by 0.09 mm day−1 and the monsoon rainfall is enhanced, particularly in the Northern Hemisphere. Areal sea ice extent decreases in both hemispheres but persists through the summers The model simulates a relaxation of the zonal SST gradient in the tropical Pacific, with the El Nino-Southern Oscillation (Nino3.4) ~ 20% weaker than the preindustrial and exhibiting extended periods of quiescence of up to 150 yr. The maximum Atlantic Meridional Overturning Circulation and northward Atlantic oceanic heat transport are indistinguishable from the control. As compared to PRISM3, CCSM4 overestimates Southern Hemisphere (SH) sea surface temperatures, but underestimates Northern Hemisphere (NH) warming, particularly in the North Atlantic suggesting that an increase in northward ocean heat transport would bring CCSM4 SSTs into better alignment with proxy data.

Citation: Rosenbloom, N. A., Otto-Bliesner, B. L., Brady, E. C., and Lawrence, P. J.: Simulating the mid-Pliocene Warm Period with the CCSM4 model, Geosci. Model Dev. Discuss., 5, 4269-4303, doi:10.5194/gmdd-5-4269-2012, 2012.
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