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Performance Comparison of The A-GRID and C-GRID Shallow-water Models On Icosahedral Grids


Different methods of solving shallow water models on icosahedral grids were compared. Specifically, researchers examined the differences in accuracy from using unstaggered variables (A-grid, with mass and velocity at cell centers) compared to staggered variables (C-grid, with mass and velocity on cell edges). It was found that C-grid performs better in noise-control and energy conservation, but error increased as resolution increased. A-grid performed better in conserving potential enstrophy and minimized error with increasing resolution. Modifications were proposed to reduce these numerical errors. Modeling shallow water on icosahedral grids on spheres is an ongoing problem to resolve in crucial weather and climate models. Understanding the associated numerical errors and methods of resolving them are key in strengthening weather and climate models.

Article / Publication Data
Available Metadata
Early Online Release
November 15, 2022
Fiscal Year
Peer Reviewed
Publication Name
The International Journal of High Performance Computing Applications
Published On
November 15, 2022
Publisher Name


Authors who have authored or contributed to this publication.

  • Jacques Middlecoff - lead Gsl
    Cooperative Institute for Research in the Atmosphere, Colorado State University
    NOAA/Global Systems Laboratory
  • Yonggang Yu - second Gsl
    Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder
    NOAA/Global Systems Laboratory
  • Mark W. Govett - third Gsl