Advanced Numerical Methods for NWP Models
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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The long-term goal of this research is to construct the Navys next-generation global numerical weather prediction NWP model using new numerical methods specifically designed for distributed-memory and vector computers. To distinguish it from the current Navy global atmospheric model, the navy Operational Global Atmospheric Prediction System NOGAPS, we shall refer to this new model as the Navys Spectral Element Atmospheric Model NSEAM. To take full advantage of distributed-memory computers, the spherical global domain of NSEAM is partitioned into local sub-domains, or elements, which can then be solved independently on multiple processors. The numerical methods used on these sub-domains must be not only local in nature but also high-order accurate and highly efficient. Thus, NSEAM is being constructed so that it is as accurate as the current spectral model NOGAPS is more efficient, thereby allowing for finer resolution forecasts and is geometrically more flexible, thereby allowing for the use of adaptive or telescoping grids. This will allow for better coupling with mesoscale models and eventually perhaps allowing for a modeling paradigm whereby the global and mesoscale models are either unified or at least share the same numerical algorithms which facilitates their maintenance.