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Sets of optimally diversified polyhedral orientations
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  • DOI:
    doi:10.7289/V5/ON-NCEP-489
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  • Description:
    Efficient integration of global atmospheric models on massively parallel computers is driving the move towards the use of discretizations based on regular polyhedra, such as the cube or icosahedron, and away from the traditional grids based on latitude and longitude alignments. In the case of NCEP's new proposed operational global model, the FV3, it is the equiangular modification of the gnomonic cubed-sphere grid that is being adopted. One risk of using any polyhedral grid is that the polyhedral shape itself will leave a subtle unwanted 'imprint' detectable in the long-duration accumulation of diagnostics from medium-range forecasts or from extended climate runs. Another difficulty relates to the numerical complications that arise from the interaction of a moving nested grid with the edges and corners of a cubic grid. These potential problems can presumably be mitigated if it is possible to switch among a prepared set of diversified grid orientations (provided the implied interpolations are performed in a sufficiently careful way that prevents them from inadvertently contributing to the imprinting problem). [doi:10.7289/V5/ON-NCEP-489: http://doi.org/10.7289/V5/ON-NCEP-489]

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