Author(s)

E.J. Spee

Abstract

We have tested four newly developed 3D advection schemes named Mol-rg, Split-u, Split-us and Split-rg. We compared these schemes with Slopes and Second Moment. Mol-rg and Split-rg make use of a reduced grid, a grid with less cells near the poles, to overcome the well known pole-singularity. Two tests were performed with all schemes: the solid-body rotation test and a radon test. The radon test uses 3D meteorological input for the month January 1992 from a numerical weather prediction model, together with parametrizations for sub-grid scale vertical transport. We compared model results with measurements on three islands in the Indian Ocean. From the solid-body rotation test we learn that all new schemes do not generate undershoot and overshoot and are mass conservative. Split-us and Split-rg are very cheap in terms o

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