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A dual representation of spectral components and grid points is used.  All fields are described in grid point space.  The grid is not completely uniform due to the convergence of the meridians towards the poles, and a Reduced Gaussian Octahedral Grid (Fig2111.A) is used.  This means the separation between grid points is kept almost constant by gradually decreasing the number of grid points towards the poles at all extratropical extra-tropical latitudes.  In effect, within each quadrant, two grid boxes (triangles) are removed as one steps away from the equator to the next latitude row.  This equates to a reduction of one grid point per quadrant per latitude row.  This grid point configuration results in a saving in computational time.

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