Computational Modes and Grid Imprinting on Five Quasi-Uniform Spherical C Grids
Computational Modes and Grid Imprinting on Five Quasi-Uniform Spherical C Grids
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DOI：
10.1175/mwr-d-11-00193.1
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发表时间：
2012-08
影响因子：
3.2
通讯作者：
H. Weller;J. Thuburn;C. Cotter
中科院分区：
文献类型：
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作者：
H. Weller;J. Thuburn;C. Cotter
摘要目前，大多数业务预报模式使用经纬度网格，其子午线向两极收敛限制了平行缩放。准均匀网格可以避免这种限制。Thuburn等人和Ringler等人开发了一种用于任意结构的正交C网格的方法，称为TRiSK，该方法具有经纬度网格上C网格的许多理想特性，但适用于各种准均匀网格。在这里，五个准均匀，正交网格的球体使用TRiSK求解浅水方程的一些优点和缺点的六边形和三角形的二十面体，一个“Voronoi化”立方体球，Voronoi化跳过经纬度网格，并与一个完整的经纬度网格的风筝进行了比较。结果表明，六边形二十面体给出了最准确的结果（最少的计算成本）。所有的网格遭受虚假的计算模式，这是特别…
AbstractCurrently, most operational forecasting models use latitude–longitude grids, whose convergence of meridians toward the poles limits parallel scaling. Quasi-uniform grids might avoid this limitation. Thuburn et al. and Ringler et al. have developed a method for arbitrarily structured, orthogonal C grids called TRiSK, which has many of the desirable properties of the C grid on latitude–longitude grids but which works on a variety of quasi-uniform grids. Here, five quasi-uniform, orthogonal grids of the sphere are investigated using TRiSK to solve the shallow-water equations.Some of the advantages and disadvantages of the hexagonal and triangular icosahedra, a “Voronoi-ized” cubed sphere, a Voronoi-ized skipped latitude–longitude grid, and a grid of kites in comparison to a full latitude–longitude grid are demonstrated. It is shown that the hexagonal icosahedron gives the most accurate results (for least computational cost). All of the grids suffer from spurious computational modes; this is especiall...