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SUMMARY:The global nonhydrostatic atmospheric model MPAS: Preliminary resu
 lts from variable-resolution mesh tests - William Skamarock\,   (National 
 Center for Atmospheric Research)
DTSTART:20120928T103500Z
DTEND:20120928T110000Z
UID:TALK40243@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:The Model for Prediction Across Scales (MPAS) is comprised of 
 geophysical fluid flow solvers using horizontally-unstructured spherical c
 entriodal Voronoi meshes and a C-grid staggering of the prognostic variabl
 es. We have constructed a global atmospheric model for these meshes that s
 olves the fully compressible nonhydrostatic equations using a finite-volum
 e formulation coupled with a split-explicit time integration technique to 
 handle acoustic modes. The Voronoi meshes are unstructured grids that perm
 it variable horizontal resolution\, and we plan to make use of variable-re
 solution meshes in our weather and regional climate applications. Towards 
 this end\, we have begun testing the robustness of variable-resolution glo
 bal mesh simulations using both idealized test cases (baroclinic waves) an
 d full NWP forecasts. Preliminary results for hydrostatic-scale tests (dx 
 > 10 km) indicate that flow features are appropriately resolved relative t
 o the local resolution if the mesh t ransition zones provide a smooth tran
 sition from coarser to finer resolution regions and if model filters are a
 ppropriately scaled by the local mesh spacing. We will present these resul
 ts and discuss their implications for variable-resolution mesh configurati
 ons and for the end applications. \n\n
LOCATION:Seminar Room 1\, Newton Institute
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