A One-dimensional Time Dependent Cloud Model
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概要
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A one-dimensional prognostic cloud model has been developed for possible use in a Cumulus Parameterization Scheme (CPS). In this model, the nonhydrostatic pressure, entrainment, cloud microphysics, lateral eddy mixing and vertical eddy mixing are included, and their effects are discussed. The inclusion of the nonhydrostatic pressure can (1) weaken vertical velocities, (2) help the cloud develop sooner, (3) help maintain a longer mature stage, (4) produce a stronger overshooting cooling, and (5) approximately double the precipitation amount. The pressure perturbation consists of buoyancy pressure and dynamic pressure, and the simulation results show that both of them are important. We have compared our simulation results with those from Ogura and Takahashi's one-dimensional cloud model, and those from the three-dimensional Weather Research and Forecast (WRF) model. Our model, including detailed cloud microphysics, generates stronger maximum vertical velocity than Ogura and Takahashi's results. Furthermore, the results illustrate that this one-dimensional model is capable of reproducing the major features of a convective cloud that are produced by the three-dimensional model when there is no ambient wind shear.
- 2002-02-25
著者
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Sun Wen-yih
Department Of Earth And Atmospheric Sciences Purdue University
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Chen Shu-hua
National Center For Atmospheric Research
関連論文
- Simulation of the 1998 East Asian Summer Monsoon using the Purdue Regional Model(Regional Climate Modeling for Monsoon System)
- Numerical Study of the 1988 Drought in the United States(Regional Climate Modeling for Monsoon System)
- A One-dimensional Time Dependent Cloud Model