Technical Sessions

develop, verify, and apply a new generation of climate models within a coordinated framework that incorporates the best available scientific and numeric:al approaches to represent physical, biogeochemical, and ecological pro-cesses; that fully utilizes the hardware and software capa-bilities of new computer architectures; that probes the limits of climate predictability; and, finally, that can be used to address the challenging problem of understanding the greenhouse climate issue through the ability of the models to simulate time-dependent climatic changes over ex-tended times and with regional resolution. Implementing all of these improvements i3.nd extensions in a single model will require an increase in effective compu-tational throughout of 10. to 106 or more. CHAMMP is aiming to achieve a factor of 102 by the mid-1990s and 10. by the end of the decade through a combination of the use of faster computers (e.g., massively palrallel computers are projected to achieve a factor of 1 ()3 increase) and advances in the efficiency 9nd accuracy of computational algorithms (a factor of 10 improvement i:; needed; use of a variable grid, for example, may provide similar accuracy to a fine, uniform grid, but at reduced computational cost, thereby increasing effective computational throughput). The CHAMMP program is currently divid,ed into two com-ponents. The scientific component, which I lead, will focus on a range of questions concerning what scientific capa-bilities must be included in the next generation of climate models in order to achieve accurate, regionally resolved projections of climatic change. Typical iss,ues relate to the relationship of resolution to predictability, the inherent natural variability of the system, how b4~st o represent processes on finer scales, and new techniques for solving the intercoupled set of equations governing the climate system. Members of the CHAMMP Science Team are being selected from universities, industr)I, and DOE and other agency laboratories based on com~letitive review of submitted proposals