Improved Simulations of Mesoscale Meteorology.
Contractor rept. Mar 77-Dec 78,
SCIENCE APPLICATIONS INC LA JOLLA CA
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Research has been performed contributing to the improved description of mesoscale meteorology in regions of complex terrain. The investigation is primarily theoretical with the emphasis being placed on the development of several computer models that balance accuracy against economy of use. A major goal of this program is the selection and formulation of suitable simplified physics models. This has been done through review of recent literature, discussion with mesoscale modeling experts, and a few analytic studies during the first phase of the study. On the basis of these studies, two different classes of models have been identified for development and implementation. A mass-consistent wind-field or variational analysis model has been formulated that employs a terrain conformal coordinate system. The technique relies heavily on observational data and is most suited to a data rich region. A computer program, VARMET, has been written, tests of the method have been performed, and several comparisons with field data were carried out. Very satisfactory model performance was found in these comparisons. The second class of model developed adheres more closely to first principles and thereby is applicable to data-poor regions. Based on the linearized steady-state Navier-Stokes equation, model LINMET is written, and the model performance is tested against field data. In addition, the primitive equation hydrostatic code SIGMET, which was developed at SAI for application to a number of meteorological programs, has been adapted to the present program. Enriched with sophisticated model physics, SIGMET simulations form the baseline case for two other simplified physics models.
- Computer Programming and Software