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Figure 2.8:
Three dimensional staggering of velocity components. This
facilitates the natural discretization of the continuity and tracer
equations.
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The basic algorithm employed for stepping forward the momentum
equations is based on retaining non-divergence of the flow at all
times. This is most naturally done if the components of flow are
staggered in space in the form of an Arakawa C grid [7].
Fig. 2.8 shows the components of flow (,,)
staggered in space such that the zonal component falls on the
interface between continuity cells in the zonal direction. Similarly
for the meridional and vertical directions. The continuity cell is
synonymous with tracer cells (they are one and the same).
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