WRF Pre-Processing System Version 4.3 http://www2.mmm.ucar.edu/wrf/users/ The WRF Pre-Processing System (WPS) is a collection of Fortran and C programs that provides data used as input to the real.exe and real_nmm.exe programs. There are three main programs and a number of auxiliary programs that are part of WPS. Both the ARW and NMM dynamical cores in WRF are supported by WPS. For questions and help to run the program, please see the User's Guide at http://www2.mmm.ucar.edu/wrf/users/docs/user_guide_v4/contents.html and send email to wrfhelp@ucar.edu. =================================================== Main programs: geogrid.exe, ungrib.exe, metgrid.exe Input to the main programs is through the namelist file "namelist.wps". Each main program has an exclusive namelist record (named "geogrid", "ungrib", or "metgrid", respectively), and the three programs have a group record (named "share") that each program reads. geogrid ------- 1) Defines the model horizontal domain 2) Horizontally interpolates static data to the model domain 3) Output conforms to the WRF I/O API ungrib ------ 1) Decodes Grib Edition 1 and 2 data 2) Uses tables to decide which variables to extract 3) Supports isobaric and generalized vertical coordinates 4) Output is in a non-WRF-I/O-API form, referred to as an intermediate format metgrid ------- 1) Ingest static data and raw meteorological fields 2) Horizontally interpolate meteorological fields to the model domain 3) Output conforms to WRF I/O API Parallelism The geogrid and metgrid programs may be run as distributed memory parallel jobs to reduce the time-to-solution. These two programs use MPI calls directly, compared to WRF, which has an abstraction layer (RSL or RSL_LITE). Grib Edition 2 The Grib Edition 2 compression requires three libraries external to the WPS source code: zlib, png, and jasper. It is recommended that users request support from their system administrators when installing these packages. Users can compile the code without these libraries by selecting the "NO GRIB2" options in the build. Building WPS Similar to the WRF package, WPS uses a two-step build mechanism, ./configure ./compile which directs the unix make underneath. If the user is on a recognized architecture, the configure script will display a list of available compile options (usually serial vs parallel, Grib 2 enabled vs a "NO GRIB2" option). For some OS options, there are multiple compilers that are supported. The configure option lists both "build GRIB2" and "do not build GRIB2" options. It is suggested that the first builds be without the GRIB Edition 2 capability. The utility plotting programs requiring NCAR Graphics are not compiled automatically. Library paths must be set correctly in configure.wps and then compiled using ./compile plotfmt ./compile plotgrids Running WPS (for serially compiled code) geogrid.exe ----------- - edit namelist.wps (&share and &geogrid sections) - make sure the correct GEOGRID.TBL is used (ls -l geogrid/GEOGRID.TBL*) - type 'geogrid.exe' to run - check output in geogrid.log ungrib.exe ---------- - edit namelist.wps for start_date and end_date, output file prefix (&share and &ungrib sections) - link correct Vtable: ls -l ungrib/Variable_Tables For example, for NCEP GFS (or AVN, FNL) data, ln -sf ungrib/Variable_Tables/Vtable.GFS Vtable - link grib data files: link_grib.csh /data-directory/file* - type 'ungrib.exe >& ungrib.out' to run - check output in ungrib.log and ungrib.out metgrid.exe ----------- - edit namelist.wps (&share and &metgrid sections) - make sure the correct METGRID.TBL is used (ls -l metgrid/METGRID.TBL*) - type 'metgrid.exe' to run - check output in metgrid.log There are a number of utility programs that will be built in WPS/util/ directory: avg_tsfc.exe ------------ purpose: computes a daily mean of the surface air temperature, reads the namelist.wps file usage: avg_tsfc.exe g1print.exe ----------- purpose: read a Grib Edition 1 file, output information to build a Vtable usage: g1print.exe GRIB1_file g2print.exe ----------- purpose: read a Grib Edition 2 file, output information to build a Vtable usage: g2print.exe GRIB2_file mod_levs.exe ------------ purpose: reduce levels in a intermediate file so that different GRIB sources may be used for the initial and lateral boundary time periods usage: mod_levs.exe OLD_intermetdiate:date_string \ NEW_intermetdiate:date_string Processes a single file at a time, uses the pressure levels defined in the namelist.wps file. plotfmt.exe ----------- purpose: generate NCAR Graphics metacode 2d horizontal plots of each field and level in the intermediate file usage: plotfmt.exe intermediate_file:date_string plotgrids.exe ------------- purpose: generate an NCEAR Graphics metacode plot of the domain locations, one frame with all of the domain locations plotted, reads the namelist.wps file to get the domain information usage: plotgrids.exe rd_intermediate.exe ------------------- purpose: read an intermediate file and print the information to the screen usage: rd_intermediate.exe intermediate_file:date_string calc_ecmwf_p.exe ------------------- purpose: when using ECMWF model data in GRIB format, computes the 3-d pressure, height, and RH fields from the output of ungrib.exe, and writes these fields to a new set of intermediate files to be used in addition to those produced by ungrib. All times between the start_date and end_date specified in the &share namelist will be processed. usage: calc_ecmwf_p.exe Static Input Data The static input data is provided in two tar files: one contains full resolution data (30", 2', 5' and 10') and the other contains only 10' low-resolution data. The data may be downloaded from http://www2.mmm.ucar.edu/wrf/users/download/get_source.html. Meteorological Input Data The meteorological input data for WPS is the GRIB Edition 1 GFS data from NCEP. A test data set (Jan 2000, 24/12Z to 25/12Z) is available from http://www2.mmm.ucar.edu/wrf/users/download/get_source.html. Sample WPS output data for WRF Samples of the output data from WPS for use in WRF for the Jan 2000 and June 2001 cases are provided from http://www2.mmm.ucar.edu/wrf/users/download/get_source.html.
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