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A semi-implicit semi-Lagrangian global nonhydrostatic model and the polar discretization scheme

Science china Earth {1. 2007年第12期50卷 1885-1891页

作者： yang xuesheng1.CHEN jiabin2,{3. jianglin1.CHEN dehui1.shen xueshun1.zhang hongliang1.1.state key laboratory of severe weather,chinese academy of meteorological sciences,{13. 100081,china 2 state key laboratory of Numerical Modeling for Atmospheric sciences and Geophysical Fluid Dynamics,Institute of Atmospheric Physics,{13. 100029,china 1. state {1. {3. of severe weather Chinese Academy of Meteorological Sciences Beijing 100081 China 2. state {1. laboratory of Numerical Modeling for Atmospheric {3. and Geophysical Fluid Dynamics Institute of Atmospheric Physics Beijing 100029 China

The Global/Regional Assimilation and PrEdiction System(GRAPES) is a newly developed global non-hydrostatic numerical prediction model,which will become the next generation medium-range opera-tional model at china {1. Administration(CMA).The dynamic framework of GRAPES is featuring with fully compressible equations,nonhydrostatic or hydrostatic optionally,two-level time semi-Lagrangian and semi-implicit time integration,Charney-Phillips vertical staggering,and complex three-dimensional pre-conditioned Helmholtz solver,*** the singularity of horizontal momentum equations at the poles,the polar discretization schemes are described,which include adoption of Arakawa C horizontal grid with ν at poles,incorporation of polar filtering to maintain the computational stability,the correction to Helmholtz equation near the poles,as well as the treatment of semi-Lagrangian interpolation to improve the departure point accuracy,*** balanced flow tests validate the rationality of the treatment of semi-Lagrangian departure point calculation and the polar discretization during long time *** and Suarez tests show that the conservation proper-ties of GRAPES model are quite good.

关键词： nonhydrostatic, global model, semi-implicit, semi-Lagrangian, polar discretization, conservation

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Verification of GRAPES unified global and regional numerical weather prediction model dynamic core

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chinese Science Bulletin 2008年第22期53卷 3458-3464页

作者： yang {1. hu {3. CHEN dehui zhang hongliang shen xueshun CHEN jiabin JI LiRen state {1. laboratory of {3. weather Chinese Academy of Meteorological Sciences Beijing 100081 China National meteorological Center Beijing 100081 China state {1. laboratory of Numerical Modeling for Atmospheric {3. and Geophysical Fluid Dynamics Institute of Atmospheric Physics Beijing 100029 China

During the past few years, most of the new developed numerical weather prediction models adopt the strategy of multi-scale technique. Therefore, {1. meteorological Administration has devoted to developing a new generation of global and regional multi-scale model since 2003. In order to validate the performance of the GRAPES (Global and Regional Assimilation and PrEdiction System) model both for its scientific design and program coding, a suite of idealized tests has been proposed and conducted, which includes the density flow test, three-dimensional mountain wave and the cross-polar flow test. The density flow experiment indicates that the dynamic core has the ability to simulate the fine scale nonlinear flow structures and its transient features. While the three-dimensional mountain wave test shows that the model can reproduce the horizontal and vertical propagation of internal gravity waves quite well. Cross-polar flow test demonstrates the rationality of both for the semi-Lagrangian departure point calculation and the discretization of the model near the poles. The real case forecasts reveal that the model has the ability to predict the large-scale weather regimes in summer such as the subtropical high, and to capture the major synoptic patterns in the mid and high latitudes.

关键词：数值天气预报气象学天气预测气象分析

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