Parallelization of the DAO Atmospheric General Circulation Model

In this paper we present a parallel Atmospheric General Circulation Model currently under development at the NASA Data Assimilation Office. The constituent simulation parameterizations of the AGCM are briefly described, and the parallelization strategy discussed. The key performance obstacles to attaining target benchmarks are treated, as well as our plans for code optimization. We also present the most current benchmarks arising from the this High Performance Computing and Communications Initiative Grand Challenge project.