Documentation of IAP (Institute of Atmospheric Physics) two-level atmospheric general circulation model

Taking the above consideration we have designed several schemes by using the spherical grids. One of the schemes, on C-grid system, was extended to the atmosphere-ocean coupled model. Most recently we also designed a B-grid scheme. Both schemes conserve the ''available'' energy of non-dissipative and adiabatic atmosphere under the ''standard stratification approximation'' or provide a bounded norm of the predicted variables in L/sub 2/ space if the implicit and split methods are applied, but without using the standard stratification approximation. The B-grid scheme is used to compute wind vector directly at gridpoints without using interpolations of wind components and can be easily used in conjunction with implicit or semi-implicit methods. However, the C-grid scheme is economical in computation and suitable to stepwise topography. It is this scheme that has been thoughtfully and systematically tested and applied to climate simulations. Based upon the C-grid scheme, a two-level global atmospheric general circulation model (AGCM) and a four-level world ocean general circulation model (OGCM) have been completed with 4/degree/ x 5/degree/ horizontal resolution and applied to climate simulations since. This report documents the control version of the IAP two-level AGCM. 54 refs.