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SUMMARY:A Three-Dimensional Finite-Volume Nonhydrostatic Icosahedral Modle
  (NIM) - Jin Lee\,   (National Oceanic and Atmosphere Administration)
DTSTART:20120927T103500Z
DTEND:20120927T110000Z
UID:TALK40211@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:The Nonhydrostatic Icosahedral Model (NIM) formulates the late
 st numerical innovation of the three-dimensional finite-volume control vol
 ume on the quasi-uniform icosahedral grid suitable for ultra-high resoluti
 on simulations. NIMs modeling goal is to improve numerical accuracy for we
 ather and climate simulations as well as to utilize the state-of-art compu
 ting architecture such as massive parallel CPUs and GPUs to deliver routin
 e high-resolution forecasts in timely manner. NIM uses innovations in mode
 l formulation similar to its hydrostatic version of the Flow-following Ico
 sahedral Model (FIM) developed by Earth System Research Laboratory (ESRL) 
 which has been tested and accepted for future use by the National Weather 
 Service as part of their operational global prediction ensemble. Innovatio
 ns from the FIM used in the NIM include: \n\n* A local coordinate system r
 emapped spherical surface to plane for numerical accuracy (Lee and MacDona
 ld\, 2009)\, * Grid points in a table-driven horizontal loop that allow an
 y horizontal point sequence (A.E. MacDonald\, et al.\, 2010)\, * Flux-Corr
 ected Transport formulated on finite-volume operators to maintain conserva
 tive positive definite transport (J.-L\, Lee\, ET. Al.\, 2010)\, * All dif
 ferentials evaluated as finite-volume integrals around the cells\, *Icosah
 edral grid optimization (Wang and Lee\, 2011) \n\nNIM extends the two-dime
 nsional finite-volume operators used in FIM into the three-dimensional fin
 ite-volume solvers designed to improve pressure gradient calculation and o
 rographic precipitation over complex terrain. The NIM dynamical core has b
 een successfully verified with various non-hydrostatic benchmark test case
 s such as warm bubble\, density current\, internal gravity wave\, and moun
 tain waves. Physical parameterizations have been incorporated into the NIM
  dynamic core and successfully tested with multimonth aqua-planet simulati
 ons. \n\n
LOCATION:Seminar Room 1\, Newton Institute
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