Brief Introduction to the High-Resolution Grid-Point Atmospheric Model

In this study, a high-resolution grid-point atmospheric model (HGAM)has been developed on the basis of the dynamical core and physical package of the Grid-point Atmospheric Model of the National Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics/Institute of Atmospheric Physics(LASG/IAP),version 2 (GAMIL2). The new model has threehorizontal resolution choices of 1° 9 1°, 0.5°9 0.5°, and 0.25° 9 0.25°, whereas its vertical layers are the same as those of GAMIL2. A 30-year integration of the Atmospheric Model Intercomparison Project (AMIP) is completed by using the 1° 9 1° version of HGAM; short-term integrations with the 0.5° 9 0.5° and 0.25° 9 0.25° versions are also conducted. The simulated results of precipitation by HGAM are shown as well as those by GAMIL2 for comparison. The geographical distribution of near-surface moisture by the 0.25° 9 0.25° version is also given.