EGU24-12060, updated on 09 Mar 2024
https://doi.org/10.5194/egusphere-egu24-12060
EGU General Assembly 2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Idealized test cases in GFDL's FV3 demonstrating the new Duo-Grid.

Joseph Mouallem1,2, Lucas Harris2, and Xi Chen3
Joseph Mouallem et al.
  • 1Princeton University, CIMES, Atmospheric and Oceanic Sciences, United States of America
  • 2Geophysical Fluid Dynamics Laboratory/NOAA, Princeton, NJ, USA
  • 3Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China

The Duo-Grid is a novel algorithm that addresses grid imprinting in generic gnomonic cubed-sphere grids. The algorithm aims to overcome grid discontinuities at the edges and corners by remapping data in a cube’s face halo region from its kinked coordinates to its natural location along extended great circle lines. We recently implemented the Duo-Grid in the Geophysical Fluid Dynamics Laboratory's (GFDL) Finite-Volume Cubed-Sphere Dynamical Core (FV3). We apply the Duo-Grid in idealized tests of 2D shallow water solver and the 3D hydrostatic and non-hydrostatic solvers. Our findings reveal that error norms are greatly reduced and grid imprinting is practically eliminated when employing the Duo-Grid. Most notably we find that a Rossby-Haurwitz wave is maintained significantly longer in the Rossby-Haurwitz tests, from about 80 to beyond 100 days. These results strongly suggest an improvement in FV3's accuracy and robustness.

How to cite: Mouallem, J., Harris, L., and Chen, X.: Idealized test cases in GFDL's FV3 demonstrating the new Duo-Grid., EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-12060, https://doi.org/10.5194/egusphere-egu24-12060, 2024.

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