The Description of the MRI Atmospheric Spectral GCM (MRI-GSPM) and Its Mean Statistics Based on a 10-year Integration.

Abstract
An atmospheric general circulation model developed in the Meteorological Research Institute is described. The model has 23 vertical layers from the earth's surface to approximately 70km in the middle mesosphere. It uses the spectral transform method with a rhomboidal 24 truncation. The model includes all major physical processes. It has been run for ten years with climatological sea surface temperatures (SSTs). The model generally simulates the features of the general atmospheric circulation in the troposphere and the stratosphere reasonably well. Some drawbacks exist, however, such as the lack of equatorial quasi-biennial oscillation (QBO). It should be emphasized that the model is successful in simulating the interannual variation in stratospheric circulation in the extratropics without any interannual changes in SSTs or external forcing.