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《Chinese Journal of Geophysics》 2009-12
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Normal mode analysis of the GRAPES global non-hydrostatic atmospheric model

WANG Guang-Hui,SHEN Xue-Shun,HU Jiang-Lin,CHEN Feng-Feng Center for Numerical Weather Prediction,Chinese Academy of Meteorological Sciences,Beijing 100081,China  
In order to analyze the effects of different atmospheric modes on dynamic procedures and the computational stability in numerical weather prediction,this paper gave a normal mode analysis of the GRAPES (Global/Regional Assimilation and PrEdiction System) global non-h ydrostatic atmospheric model.First of all,a system of linearized equations was set up with respect to an atmosphere at rest,and a couple eigenvalue-eigenfunction problem was formulated, which consists of horizontal and vertical structure equations with suitable boundary conditions. By means of numerical analysis for the couple problem under isothermal atmosphere,we arrived at the following conclusion:for the non-hydrostatic model,there is an additional kind of eastward and westward propagating acoustic-inertial oscillation besides eastward and westward propagating gravity-inertial oscillation and westward propagating Rossby oscillation are identical to those in the hydrostatic version of the model.Especially,the non-hydrostatic effect on the gravity-inertial oscillation becomes significant only when the aspect ratio is large.
【Fund】: 国家自然科学基金(40675063 40745033 40675062);; “十一五”国家科技支撑项目“灾害天气精细数值预报系统及短期气候集合预测研究”第二课题(2006BAC02B02)资助.
【CateGory Index】: P401
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