Clim. Past Discuss., 8, 3277-3343, 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 Climate of the Past (CP). Please refer to the corresponding final paper in CP.
Climate and African precipitation changes in the mid-Holocene simulated using an Earth System Model MIROC-ESM
R. Ohgaito1, T. Sueyoshi1, A. Abe-Ouchi1,2, T. Hajima1, S. Watanabe1, H.-J. Kim1, A. Yamamoto2, and M. Kawamiya1
1Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan
2Atmosphere and Ocean Research Institute, The University of Tokyo, Chiba, Japan

Abstract. The importance of evaluating models using paleoclimate simulations is becoming more recognized in efforts to improve climate projection. To evaluate an integrated Earth System Model, MIROC-ESM, we performed simulations in time-slice experiments for the mid-Holocene (6000 yr before present, 6 ka) and preindustrial (1850 AD) times under the protocol of the Coupled Model Intercomparison Project 5/Paleoclimate Modelling Intercomparison Project 3. We first overview the simulated global climates by comparing with simulations using a previous version of the MIROC model (MIROC3), which is an atmosphere-ocean coupled general circulation model, and then comprehensively discuss various aspects of climate change with 6 ka forcing. We also discuss the 6 ka African monsoon activity. The 6 ka precipitation change over northern Africa according to MIROC-ESM does not differ dramatically from that obtained with MIROC3, which means that newly developed components such as dynamic vegetation and improvements in the atmospheric processes do not have significant impacts on representing the 6 ka monsoon change suggested by proxy records. Although there is no drastic difference in the African monsoon representation between the two models, there are small but significant differences in the precipitation enhancement in MIROC-ESM, which can be related to the representation of the sea surface temperature rather than the vegetation coupling, at least in MIROC-ESM.

Citation: Ohgaito, R., Sueyoshi, T., Abe-Ouchi, A., Hajima, T., Watanabe, S., Kim, H.-J., Yamamoto, A., and Kawamiya, M.: Climate and African precipitation changes in the mid-Holocene simulated using an Earth System Model MIROC-ESM, Clim. Past Discuss., 8, 3277-3343, doi:10.5194/cpd-8-3277-2012, 2012.
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