1. Summary

We consider design of an atmospheric general circulation model, GFD Dennou Club AGCM6.
that helps us to understand dynamics and to perform a comparative study of planetary atmospheres. 

As a first step, we develop a spherical shallow water model of SPMODEL.
The readability of source code is improved.

The performance of the model is examined by the standard test cases of Williamson et al. (1992).		

It can be utilized for further designing of the dynamical core of AGCM6.