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Introduction to the WRF Modeling System

Introduction to the WRF Modeling System

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Introduction to the WRF Modeling System

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  1. Introduction to the WRF Modeling System Wei Wang NCAR/MMM

  2. WRF Modeling System Overview

  3. Modeling System Components • WRF Standard Initialization (WRF SI) • For real-data runs • Inputs • Terrain/land-use/soil texture/albedo • Grid location/levels • Gridded fields (in GRIB format) • Output • Surface and meteorological fields on WRF grid at various times e.g. real_input_em.d01.(date_string)

  4. Modeling System Components • Programs real.F and ideal.F • Used for model initialization • Provide hydrostatically balanced fields for WRF model • Convert met. fields to WRF model variables • Provide fields in WRF I/O format

  5. Modeling System Components • Program real.F for real-data initialization • Inputs • WRF namelist.input • Standard Initialization output • Outputs • WRF input file (wrfinput_d01) • WRF boundary file (wrfbdy_d01) • Executable: real.exe

  6. Modeling System Components • Program ideal.F for idealized cases • Inputs • WRF namelist.input • Soundings or prescribed 3D fields • Outputs • WRF input file (wrfinput_d01) • Different executable ideal.exe for different cases

  7. Modeling System Components • Program wrf.F (executable: wrf.exe) • Inputs • WRF namelist.input • WRF input file (wrfinput_d01) • WRF boundary file (wrfbdy_d01, for real-data cases only) • Various physics data files • Outputs • WRF output files [wrfout_d01_(time)] • WRF restart files [wrfrst_d01_(time)] • Full physics option available for NWP

  8. WRF I/O • Current option is netCDF • Can be plotted with NCL scripts • Can be converted to Vis5D, GrADS, and RIP (not all works for idealized data yet) • Additional program: MM52WRF • For height core only, currently • Converts MM5 input to WRF/real input • Program to convert MM5 pressure-level data to WRF mass model input is planned.

  9. Software Aspect • WRF SI • Single-processor job • Currently tested on Linux, IBM, Alpha, and SGI • WRF • real / ideal: single processor job • WRF: fully parallelized for 3D cases: Single, OpenMP, MPI

  10. Software Aspect • WRF modeling system software requires the following: • Fortran 90/95 compiler • C compiler • Perl • netCDF library • Public domain mpich to run WRF model in MPI

  11. What the current WRF System (v1.3) does not have • Multiple output formats • Direct ingest of non-GRIB data – through intermediate file or alternative MM5 pre-processing • Nesting (1-way or 2-way) – next release • 3DVAR – beta-release at the end of June • Observation ingest and analysis – through 3DVAR and alternative MM5 pre-processing • FDDA – analysis nudging first (probably early next year)

  12. User Support • Available by email: wrfhelp@ucar.edu • User Web page: http://www.mmm.ucar.edu/wrf/users/ • Instructions on how to run the system • WRF software download • Release updates • Some documentation

  13. WRF Modeling System Overview