Abstract
A spectral atmospheric general circulation model called AFES for climate studies was developed and optimized for the Earth Simulator. The model is a global three-dimensional hydrostatic model using the spectral transform method. We achieved an extremely high efficiency executing AFES in the T1279L96 resolution on the Earth Simulator. The performances of 26.58 Tflops for a 10-timestep run and 23.93 Tflops for a 1-day simulation run were achieved using all 5120 processors. These performances correspond to 64.9% and 58.4%. respectively, of the theoretical peak performance 40.96 Tflops. The T1279 resolution, equivalent to about 10 km horizontal grid interval at the equator, is very close to the highest resolution in which the hydrostatic approximation is valid. To our best knowledge, no other model simulation of the global atmosphere has ever been performed with such super high resolution. Currently, such a simulation is possible only on the Earth Simulator with AFES. In this paper we describe vector parallel programming, optimization method and computational performance.
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