The presentation is intended to provided a forum for discussion of a collaboration between the GFDL and ANL on development of an ultra high-resolution global climate/weather model for exascale systems. Over the last year, significant progress has been made in development of a 4.5km global non-hydrostatic atmospheric dynamical core on the IBM-BG/P.

The talk will describe the software issues that were addressed to enable the infrastructure to support this development. Construction has begun on a prototype 4.5km global model with full-physics and we shall describe the software challenges that will need to be addressed to accomplish the projects science and software infrastructure goals. We intend that the collaboration between the GFDL and ANL will expand into a community activity in which the global model will be used by the community as a resource for experimentation into climate change.