Séminaire
We are developing a new global model that will be well suited for both weather and climate applications on scales ranging from cloud to global, and that can run efficiently on massively parallel (petascale) computers. For these purposes, we are designing and implementing a new non-hydrostatic dynamical core on spherical centroidal Voronoi tesselations (SCVT; nominally hexagonal meshes) with C-grid staggering. The unstructured meshes are well suited for both uniform resolution applications and for applications where increased resolution is needed in selected regions. This development is part of a larger effort, in collaboration with the Los Alamos National Laboratory, that utilizes a C-grid SCVT unstructured-grid framework for ocean and sea-ice models in addition to the atmospheric model. We have constructed a non-hydrostatic dynamical cores that utilizes a split-explicit third-order Runge Kutta time integration scheme, a vector invariant form for the horizontal momentum equations, higher order scalar transport, and a generalized terrain-following height-based hybrid vertical coordinate. This prototype has been tested by performing baroclinic wave simulations on the sphere and nonhydrostatic cloud simulations on planar hexagonal meshes. We are also testing a hydrostatic version of the solver by producing aquaplanet simulations.
Our presentation will summarize the unique features of the new MPAS atmospheric solver and provide results from idealized simulations that document its capabilities.
Riwal Plougonven, LMD-ENS, 24 rue Lhomond, 75005
01 44 32 27 31