半拉格朗日、半隐式欧拉方程组大气数值模式研究  

An Atmospheric Model with Semi-Lagrangian and Semi-Inplicit Eulerian Equations Preliminary Numeical Tests on Deep Convection

作　　者：陈泽宇[1] 胡隐樵[1] 言穆弘[1] 高由禧[1] 

机构地区：[1]中国科学院兰州高原大气物理研究所,兰州730000

出　　处：《大气科学》2000年第6期804-820,共17页Chinese Journal of Atmospheric Sciences

基　　金：国家自然科学基金! 49835010

摘　　要：介绍了一个具有较高时间积分效率的三维弹性大气数值模式。其中，控制方程为能够描述大气非静力及可压缩性的欧拉方程组，时间积分采用了高效率的“半拉格朗日、半隐式”方案。通过引用一个简化的“云物理过程”参数化方案，针对大气中深厚湿对流过程的若干问题进行了数值试验，结果表明，模式能够对该过程中的一些基本和复杂现象进行有效地模拟。试验结果还表明，动力学框架具有很好的稳定性，能够实现高效率的时间积分，它还具有较好的频散特性，保证了空间计算的精度，从而完好地描述了风暴的形态。An efficiently three-dimensional numerical atmospheric model with a highly simplified ' cloud micro-physics' parameterization scheme used to simulate deep moist convection is presented. It is based on Eulerian equations, and solved with the ' Semi-Lagrangian and Semi-Implicit' time integration scheme. The authors Performed a series numerical tests on deep convective motion. The results show that the model is capable of simulating the strongly convective motion in the atmosphere. It also shows that the numerical dispersion property of the SLSI scheme is pretty good, so the spatial charcteristics of convective storm can well be preserved. All the results show that SLSI scheme is a highly efficient time integration'scheme. It will play an important role in the improvement of numerical simulations of meso-to micro-scale motion in the atmosphere.

关 键 词：半拉格朗日 半隐式 欧拉方程组 大气 数值模式 

分 类 号：P435[天文地球—大气科学及气象学]