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
Third order convergence of shallow water model at day 3
END