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

Science china Earth sciences 2007年第12期50卷 1885-1891页

作者： yang xuesheng1.chen jiabin2,HU jianglin1.chen dehui1.shen {3. hongliang1.1.state key laboratory of severe weather,chinese academy of meteorological sciences,Beijing 100081,china 2 state key laboratory of Numerical Modeling for Atmospheric sciences and Geophysical Fluid Dynamics,Institute of Atmospheric Physics,Beijing 100029,china 1. state key laboratory of {3. weather Chinese Academy of Meteorological Sciences Beijing 100081 China 2. state key 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 meteorological 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 xuesheng HU jianglin {3. dehui zhang hongliang shen xueshun {3. jiabin JI LiRen state key laboratory of {3. weather Chinese Academy of Meteorological Sciences Beijing 100081 China National meteorological Center Beijing 100081 China state key 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, china 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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New generation of multi-scale NWP system (GRAPES):general scientific design

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chinese Science Bulletin 2008年第22期53卷 3433-3445页

作者： chen dehui XUE JiShan yang {3. zhang hongliang shen xueshun HU jianglin WANG Yu JI LiRen chen jiabin state key laboratory of Server {3. Chinese Academy of Meteorological Sciences Beijing 100081 China National meteorological Center Beijing 100081 China Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100089 China

A new generation of numerical prediction system GRAPES (a short form of Global/Regional Assimilation and PrEdiction System) was set up in china meteorological Administration (CMA). This paper focuses on the scientific design and preliminary results of the numerical prediction model in GRAPES, including basic idea and strategy of the general scientific design, multi-scale dynamic core, physical package configuration, architecture and parallelization of the codes. A series of numerical experiments using the real data with horizontal resolutions from 10 to 280 km and idealized experiments with very high resolution up to 100 m are conducted, giving encouraging results supporting the multi-scale application of GRAPES. The results of operational implementation of GRAPES model in some NWP centers are also presented with stress at evaluations of the capability to predict the main features of precipitation in china. Finally the issues to be dealt with for further development are discussed.

关键词：数值天气预报气象学天气预测 GRAPES

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