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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.

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ICON Bucharest 2006J.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
Local zooming option: grid generation

> Lat-Lon region > Circular region

> 3 refinement leves > 3 refinement levels

rhomboidal divisions of the sphere
Rhomboidal divisions of the sphere

NP=3 NP=4 NP=5

Cube 4-body Isocahedron

bilinear grids
Bilinear grids
  • 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.