18th Conference on Weather and Forecasting, 14th Conference on Numerical Weather Prediction, and Ninth Conference on Mesoscale Processes

Tuesday, 31 July 2001: 10:30 AM
A semi-lagrangian dynamical core for the non-hydrostatic wrf model
R. James Purser, General Sciences Corporation, Beltville, MD; and T. Fujita, S. K. Kar, and J. G. Michalakes
Poster PDF (904.5 kB)
A non-hydrostatic semi-Lagrangian dynamical core is under development as part of the multi-institution Weather Research and Forecasting (WRF) initiative. The model employs high-order operators for spatial differencing and for the mass-conserving grid-to-grid `cascade' interpolations. The semi-Lagrangian advection with forward trajectories permits the implementation of low-storage third- and fourth-order Runge-Kutta time integrations. Suitable modifications of the Runge-Kutta scheme allow the fast acoustic modes of the model to be treated in a semi-implicit way. We shall describe some of these features in greater detail and discuss implementation strategies that take advantage of massive parallelization. Results from preliminary tests will also be presented.

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