The Japan Meteorological Agency (JMA) and the Meteorological Research Institute (MRI) have developed a global hydrostatic atmospheric model with a 20-km grid size. The time integration was accelerated by introducing a semi-Lagrangian three-dimensional advection scheme The model has a horizontal spectral truncation of TL959 corresponding to about a 20-km horizontal grid spacing and has 60 levels with a 0.1 hPa (altitude of about 65 km) top. We have conduced an Atmospheric Model Intercomparison Project(AMIP)-type experiment in which the model was forced with observed sea surface temperature from January 1979 through February 2006.The integration of the 20-km model and data processing were performed on the Earth Simulator. The performance of model with respect to climatology and year-to-year variability will be presented as well as the reproducibility of specific abnormal weather condition such as the hot summer of 2003 over Europe.
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