Abstract
The Global/Regional Assimilation and PrEdiction System (GRAPES) is a newly developed global nonhydrostatic numerical prediction model, which will become the next generation medium-range operational 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, etc. Concerning the singularity of horizontal momentum equations at the poles, the polar discretization schemes are described, which include adoption of Arakawa C horizontal grid with v 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, etc. The balanced flow tests validate the rationality of the treatment of semi-Lagrangian departure point calculation and the polar discretization during long time integration. Held and Suarez tests show that the conservation properties of GRAPES model are quite good.
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Supported by the Ministry of Science and Technology of China (Grant Nos. 2006BAC02B01 and 2006BAC03B03), the National High Technology Research and Development Program of China (863 Program) (Grant No. 2006AA01A123)
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Yang, X., Chen, J., Hu, J. et al. A semi-implicit semi-Lagrangian global nonhydrostatic model and the polar discretization scheme. Sci. China Ser. D-Earth Sci. 50, 1885–1891 (2007). https://doi.org/10.1007/s11430-007-0124-7
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DOI: https://doi.org/10.1007/s11430-007-0124-7