Abstract
The Regional Atmospheric Modeling System (RAMS) developed at Colorado State University is being widely applied in regulatory, operational forecasting and emergency response programs (Pielke et al., 1992). Its two-way nesting capability facilitates use of the model over relatively small regions employing a very fine innermost grid while at the same time treating the influences of inhomogeneous and time variable synoptic fields within which the mesoscale perturbations develop. RAMS has been applied using horizontal mesh sizes (Δx) from as large as 100 km to only 1 meter. The model predicts the basic state variables (U,V,W wind components, pressure, temperature and mixing ratio) as well as a wide variety of derived products, including planetary boundary layer (PBL) depth. RAMS also drives an advanced dispersion code called HYPACT(Hybrid Particle and Concentration Transport). HYPACT disperses emissions from a variety of source types using both Lagrangian particle and Eulerian methodologies (Lyons et al., 1993). Two recent RAMS applications will be summarized.
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