Changes between Version 27 and Version 28 of WikiStart


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Timestamp:
09/18/20 16:40:11 (4 years ago)
Author:
millour
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  • WikiStart

    v27 v28  
    33The DYNAMICO project develops a new dynamical core for LMD-Z, the atmospheric general circulation model (GCM) part of IPSL-CM Earth System Model. 
    44 
    5 LMDZ4, the current version of LMD-Z, has a shallow-atmosphere, hydrostatic dynamical core. It is based on a latitude-longitude C-grid, a hybrid pressure-based terrain-following vertical coordinate, second-order enstrophy-conserving finite-difference discretization and positive-definite advection. Grid refinement is implemented as a continuous zoom via smooth grid stretching. An extensive package of physical paramererizations is coupled to the dynamical core. IPSL-CM is currently used to produce AR5 simulations. LMD-Z is also at the heart of GCMs of planetary atmospheres (Mars, Venus and Titan). 
     5LMDZ5, the current version of LMD-Z ([https://lmdz.lmd.jussieu.fr/]), has a shallow-atmosphere, hydrostatic dynamical core. It is based on a latitude-longitude C-grid, a hybrid pressure-based terrain-following vertical coordinate, second-order enstrophy-conserving finite-difference discretization and positive-definite advection. Grid refinement is implemented as a continuous zoom via smooth grid stretching. An extensive package of physical paramererizations is coupled to the dynamical core. IPSL-CM is currently used to produce AR5 simulations. LMD-Z is also at the heart of GCMs of planetary atmospheres (Mars, Venus and Titan). 
    66 
    77It is well-known that the latitude-longitude coordinates have a strong singularity at the poles which is undesirable in terms of both numerical stability and computational efficiency. Regular tesselations of the sphere such as a recursively subdivided icosahedron provide an almost-uniform grid and a path to highly parallel computations based on domain decomposition. LMD's logo is itself an icosahedron, evoking the pioneering work of Robert Sadourny on the use of icosahedral grids for solving the equations of atmospheric motion.