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Geosci. Model Dev., 5, 1221-1243, 2012
https://doi.org/10.5194/gmd-5-1221-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.
Model description paper
05 Oct 2012

Modelling mid-Pliocene climate with COSMOS
C. Stepanek1 and G. Lohmann1,2 1Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany
2Institute for Environmental Physics, University of Bremen, Bremen, Germany
Abstract. In this manuscript we describe the experimental procedure employed at the Alfred Wegener Institute in Germany in the preparation of the simulations for the Pliocene Model Intercomparison Project (PlioMIP). We present a description of the utilized Community Earth System Models (COSMOS, version: COSMOS-landveg r2413, 2009) and document the procedures that we applied to transfer the Pliocene Research, Interpretation and Synoptic Mapping (PRISM) Project mid-Pliocene reconstruction into model forcing fields. The model setup and spin-up procedure are described for both the paleo- and preindustrial (PI) time slices of PlioMIP experiments 1 and 2, and general results that depict the performance of our model setup for mid-Pliocene conditions are presented. The mid-Pliocene, as simulated with our COSMOS setup and PRISM boundary conditions, is both warmer and wetter in the global mean than the PI. The globally averaged annual mean surface air temperature in the mid-Pliocene standalone atmosphere (fully coupled atmosphere-ocean) simulation is 17.35 °C (17.82 °C), which implies a warming of 2.23 °C (3.40 °C) relative to the respective PI control simulation.

Citation: Stepanek, C. and Lohmann, G.: Modelling mid-Pliocene climate with COSMOS, Geosci. Model Dev., 5, 1221-1243, https://doi.org/10.5194/gmd-5-1221-2012, 2012.
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