ICON Bucharest 2006 J.Steppeler, Ripodas, Th. Heinze, D. Majewski (DWD - German Weather Service, Offenbach, Germany) L. Bonaventura (MOX - Politecnico.

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Presentation transcript:

ICON Bucharest 2006 J.Steppeler, Ripodas, Th. Heinze, D. Majewski (DWD - German Weather Service, Offenbach, Germany) L. Bonaventura (MOX - Politecnico di Milano, Italy) M. A. Giorgetta (Max Planck Institute for Meteorology, Hamburg, Germany)

Intro: Goals of the ICON project New unified weather forecasting (DWD) and climate model (MPI-M). Mass conservation + discr. continuity eq. = discr. transport eq. with c≡1 Quasi uniform horizontal resolution  icosahedral grids Local grid refinement in one or more regions  triangular cells Global or regional domain Hydrostatic, and non-hydrostatic Ocean GCM using same grid and data structures and numerical operators

Intro: Main participants DWD:Deutscher Wetterdienst, Germany D. Majewski, Th. Heinze, P. Ripodas, B. Ritter, H. Frank, D. Liermann, U. Schättler, J. Steppeler MPI-M:Max-Planck-Institute for Meteorology, Germany E. Roeckner, M. Giorgetta, L. Kornblueh, U. Schulzweida, P. Korn, H.Wan MOX – Politecnico di Milano, Italy L. Bonaventura Others: W. Sawyer (ETH Zürich), P. Sanders (Uni Karlsruhe), D. Steurer (MPI-I, Saarbrücken), J. Baudisch (TU München) Discussions and/or joint work: R. Klein, F.X. Giraldo, J. Klemp, D. Randall, T. Ringler, H. Tomita

ICON main line Grid structure based on Thuburn (1997) + optimization option (Heikes and Randall, 1995) 2 conservation variants: –Mass and potential vorticity conservative scheme –Mass and energy conserving scheme 2 or 3 time level semi-implicit time stepping ICON side line Grid structure based on great circle grids Uniform third order approximation Easy incorporation of ordinary grid conceps and existing local models

GME: 3 time level ICOSWP: 2 time level

Local zooming option: grid generation > Lat-Lon region > Circular region > 3 refinement leves > 3 refinement levels

NP=3 NP=4 NP=5 Cube 4-body Isocahedron Rhomboidal divisions of the sphere

Four points r1,r2,r3,r4 may have any position in space Divide the sides of the rhomboid equally and connect opposite points Bilinear grid theorem: each coordinate line intersects each line of the crossing coordinate line family. The grid is regular in each direction. Bilinear grids

Third order convergence of shallow water model at day 3

END