A nonhydrostatic model for simulation of airflow over mesoscale bell-shaped ridges |
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Authors: | Xiaohua Yang |
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Institution: | (1) Department of Meteorology, Uppsala University, Box 516, S-751 20 Uppsala, Sweden;(2) Present address: Scripps Institution of Oceanography, 92093-0230 La Jolla, CA, USA |
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Abstract: | This paper describes a nonhydrostatic and incompressible mesoscale model formulation using a terrain-following coordinate system. A tensor transformation procedure is used to derive a diagnostic equation for the nonhydrostatic pressure field. The model features a simplified second-order turbulence closure scheme. The two-dimensional version of the nonhydrostatic model, as well as the corresponding hydrostatic model, are applied to simulate stably stratified airflow over mesoscale bell-shaped mountain ridges. The results show that the nonhydrostatic model is capable of simulating nonhydrostatic dynamics of mesoscale lee wave systems such as the trapped wave phenomenon. |
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