A Two-Way Interactive Nesting Procedure with Variable Terrain Resolution

Da-Lin Zhang Department of Meteorology, The Pennsylvania State University, University Park, PA 16802

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Hai-Ru Chang Department of Meteorology, The Pennsylvania State University, University Park, PA 16802

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Nelson L. Seaman Department of Meteorology, The Pennsylvania State University, University Park, PA 16802

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Thomas T. Warner Department of Meteorology, The Pennsylvania State University, University Park, PA 16802

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J. Michael Fritsch Department of Meteorology, The Pennsylvania State University, University Park, PA 16802

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Abstract

A two-way interactive, nested-grid system tested with The Pennsylvania Slate University/INCAR three-dimensional mesoscale model is described. A mesh structure, designed to minimize numerical noise, together with a procedure for obtaining compatible coarse grid mesh (COM) and fine grid mesh (FOM) terrain conditions, is presented. Also, a method to initialize the nested-grid meshes is proposed. The nested-grid system has been tested with real data and raw terrain under different severe conditions. A 12-h simulation of a propagating jet streak over complex terrain is presented; the results indicate relatively noise-free solutions on both the OGM and FGM domains.

Abstract

A two-way interactive, nested-grid system tested with The Pennsylvania Slate University/INCAR three-dimensional mesoscale model is described. A mesh structure, designed to minimize numerical noise, together with a procedure for obtaining compatible coarse grid mesh (COM) and fine grid mesh (FOM) terrain conditions, is presented. Also, a method to initialize the nested-grid meshes is proposed. The nested-grid system has been tested with real data and raw terrain under different severe conditions. A 12-h simulation of a propagating jet streak over complex terrain is presented; the results indicate relatively noise-free solutions on both the OGM and FGM domains.

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