Comparison between Hydrostatic and Nonhydrostatic Dynamics Solvers for Atmospheric Models
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Abstract:
This paper presents a preliminary study that aims to find a new approach to the quick incorporating of the nonhydrostatic features of the dynamics of atmosphere into current hydrostatic Atmospheric General Circulation Models (AGCMs) in a highly efficient manner so as to enable them to accommodate the characteristics and requirements of highresolution climate modeling in the future. The study uses the WRF model as an example and compares, from both qualitative and quantitative perspectives, the hydrostatic and nonhydrostatic dynamics solvers built in the model in order to identify the factors that account for the differences between the two versions of dynamics solvers. Research shows that the differences can be represented by a “switch” variable that is capable to turn on or off the impacts of nonhydrostatic perturbations on the dynamics of the atmosphere. In addition, it is found that the variable generally has the greatest influence on the vertical motion of the atmosphere, while its impact on the atmospheric motion in the horizontal direction is rather insignificant. These observations, in fact, reveal a new possible approach to solving the problem mentioned above by focusing on constructing a highly efficient mathematical model for the switch variable and then incorporating it into the dynamics solvers adopted in current hydrostatic AGCMs.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.