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Keywords:

  • staggered grid;
  • numerical dispersion

Abstract

Some spatial averaging of the Coriolis terms is unavoidable on the staggered C-grid, and the resulting artifical slowing of near-grid-scale inertial waves in numerical models is well-known. A poor treatment of near-grid-scale Rossby waves might also be expected. It is shown here that numerical Rossby wave dispersion on the C-grid is sensitive to the details of the discretization of the Coriolis terms, and that quite good Rossby wave dispersion can be obtained even for near-grid-scale meridional wavelengths. Copyright © 2007 Royal Meteorological Society