Nonhydrostatic Atmospheric Modeling using a z-Coordinate Representation

Steppeler, Jürgen; Bitzer, Heinz-Werner; Minotte, Maud; Bonaventura, Luca
August 2002
Monthly Weather Review;Aug2002, Vol. 130 Issue 8, p2143
Academic Journal
A representation of the orography based on approximate finite-volume techniques is applied to a nonhydrostatic atmospheric model. Techniques previously developed by the authors in the context of a semi-implicit, semi-Lagrangian model are applied also to a Eulerian, split-explicit model. Furthermore, an improved formulation of the original approach is introduced, which allows for better orography representation by introducing a simplified version of the most general shaved cells. A two-dimensional numerical test shows that the method developed does not suffer from the problems reported in connection with the η-coordinate.


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