A Global Version of the PSU/NCAR Mesoscale Model
A Global Version of the PSU/NCAR Mesoscale Model
复制标题
PSU/NCAR 中尺度模型的全球版本
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
J. Bresch
中科院分区：
文献类型：
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作者：
J. Dudhia;J. Bresch
摘要介绍了美国宾夕法尼亚州立大学-国家大气研究中心第五代中尺度模式（PSU-NCAR MM 5）的全球版本。新模型采用两个极球赤平投影域，每个极球投影域以每个极为中心。这些域在它们的赤道处相互作用，从而消除了对横向边界条件文件的需要。本文介绍了这种方法，并将这种完全可压缩的非静力欧拉全球模式与其他全球模式进行了比较。与球面极坐标网格相比，球面极坐标网格在分辨率分布和极点附近曲率力的处理方面具有潜在的优势。该模型还选择性地阻尼声学模式，这似乎有一些好处，在实际数据的初始化。分裂显式的时间步长是不同的半隐式计划中使用的几个全球非静力模式，这种本地化的计划避免了需要全球椭圆求解器，使其特别适合分布式存储平台和使用…
Abstract A global version of the fifth-generation Pennsylvania State University–National Center for Atmospheric Research Mesoscale Model (PSU–NCAR MM5) is described. The new model employs two polar stereographic projection domains centered on each pole. These domains interact at their equators, thereby eliminating the need for a lateral boundary condition file. This paper describes the method, and contrasts this fully compressible nonhydrostatic Eulerian global model with other global models. There are potential advantages over spherical polar grids in the resolution distribution and the treatment of curvature forces near the poles. The model also selectively damps acoustic modes, which appears to have some benefits in real-data initialization. The split-explicit time steps are different from the semi-implicit schemes used in several global nonhydrostatic models, and this localized scheme avoids the need for global elliptic solvers, making it particularly adept for distributed-memory platforms and the use...