WRF Modeling System Overview
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1 WRF Modeling System Overview Louisa Nance National Center for Atmospheric Research (NCAR) Developmental Testbed Center (DTC) 27 February
2 Outline What is WRF? WRF Modeling System WRF Software Design WRF Dynamic Cores WRF Physics Overview of WRF Modeling System Components 2
3 What is WRF? Weather Research and Forecasting Model Freely available community model Development led by NCAR/MMM, NOAA/ESRL/GSD and NOAA/NCEP/EMC with partnerships at AFWA, FAA, NRL and collaborations with universities and other government agencies Includes research and operational models Highly modular, single source code with plug-compatible modules Two dynamic cores Multiple physics package options State-of-the-art, transportable, and efficient in a massively parallel computing environment Designed primarily for high-resolution (nonhydrostatic) applications 3
4 Original WRF Modeling System WRF Terrestrial Data SI Current release WRFV2.2 Dynamic Cores ARW NMM Post Processing Utilities Gridded Data: NAM, GFS, RUC, NNRP, AGRMET(soil) Standard Physics Interface Physics Packages WRF Software Infrastructure 4
5 New WRF Modeling System WRF Terrestrial Data WPS Dynamic Cores ARW NMM Post Processing Utilities Gridded Data: NAM, GFS, RUC, NNRP, AGRMET(soil) Standard Physics Interface Physics Packages WPP WRF Software Infrastructure 5
6 WRF Software Design Modular, hierarchical design Plug compatible physics, dynamic cores Parallelism on distributedand shared memory processors Efficient scaling on foreseeable parallel platforms Integration into Earth System Model Framework (ESMF) Driver Layer Mediation Layer Model Layer WRF Software will be explained in detail by Dave Gill. 6
7 WRF Dynamic Cores Advance Research WRF (ARW) developed by NCAR/MMM Terrain-following hydrostatic pressure vertical coordinate Arakawa C-grid 3 rd order Runge-Kutta split-explicit time differencing, 5 th or 6 th order differencing for advection Conserves mass, momentum, dry entropy, and scalars using flux form prognostic equations Non-hydrostatic Meso-Scale Model (NMM) developed by NOAA/NCEP/EMC Terrain-following hybrid (sigma-pressure) vertical coordinate Arakawa E-grid Explicit time differencing Conserves mass, kinetic energy, enstrophy & momentum, as well as a number of additional 1 st order and quadratic quantities using 2 nd order finite differencing NMM dynamic core will be presented in detail by Zavisa Janjic. 7
8 WRF Physics Plug-compatible interface defined for physics modules NCEP s operationally used physics options for WRF-NMM: Microphysics: Ferrier Cumulus Convection: Betts-Miller-Janjic Shortwave Radiation: GFDL Longwave Radiation: GFDL Lateral diffusion: Smagorinsky PBL, free atmosphere: Mellor-Yamada-Janjic Surface Layer: Janjic Scheme Land-Surface: 4-layer soil model Physics options will be discussed in detail by Jimy Dudhia. 8
9 WRF Pre-processing System (WPS) Defines simulation domain area Produces terrain, landuse, soil type etc on the simulation domain ( static fields) De-gribs GRIB files for meteorological data (u, v, T, q, sfc pressure, soil data, snow data, SST etc) Interpolates meteorological data to WRF grid (horizontally) WPS will be presented in detail by Dave Gill. 9
10 WRF Model Select dynamic core prior to build - environment settings Select physics options at run-time - namelist (exception running GFDL radiation w/ microphysics other than Ferrier) Two programs real_nmm.exe: Converts meteorological fields to WRF model variables Performs vertical interpolation to model levels (new w/ WPS) Creates initial and lateral boundary condition files Model initialization will be presented in detail by Matthew Pyle. wrf.exe: Numerical integration program Single domain or one-way static nested domains How to set-up and run WRF will be presented in detail by Jamie Wolff Namelist options will be presented in detail by Ligia Bernardet Nesting will be presented in detail by Matt Pyle 10
11 WRF Post Processor (WPP) Processes output from NMM & ARW De-staggers variables Interpolates to pressure levels and user definedgrid Outputs in standard GRIB format, which can be read by most graphical packages Scripts available for GEMPAK and GrADS visualization packages. WPP will be presented in detail by Hui-Ya Chuang. 11
12 Software Requirements FORTRAN 90/95 compiler (Preferably PGI for LINUX systems) C compiler Perl netcdf library Public domain mpich to run WRF model w/ MPI 12
13 Available by User Support WRF-NMM Users page: WRF software download Release updates Documentation Copies of tutorial presentations Links to useful sites 13
14 Tutorial Schedule Lectures: Tue., Wed., Thu., Fri. (morning) Practical Sessions: Wed., Thu., Fri afternoon (optional) Acknowledgements: Thanks to earlier presentations of NCAR/MMM for providing an excellent starting point for this talk and others to come during this tutorial. 14
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