WRF ARW User's Guide - MMM - UCAR

WRF-VAR
> mv obs_gts_2008-02-05_14:00:00.4DVAR $DAT_DIR/ob/2008020514/ob.ascii
> mv obs_gts_2008-02-05_15:00:00.4DVAR $DAT_DIR/ob/2008020515/ob.ascii
> mv obs_gts_2008-02-05_16:00:00.4DVAR $DAT_DIR/ob/2008020516/ob.ascii
> mv obs_gts_2008-02-05_17:00:00.4DVAR $DAT_DIR/ob/2008020517/ob.ascii
> mv obs_gts_2008-02-05_18:00:00.4DVAR $DAT_DIR/ob/2008020518/ob.ascii-
At this pont you have three of the input files (first guess, observation and background error
statistics files in directory $DAT_DIR) required to run WRF-Var, and have successfully
downloaded and compiled the WRF-Var code. If this is correct, we are ready to learn
how to run WRF-Var.
b. Run the Case—3D-Var
The data for this case is valid at 12 UTC 5 th February 2008. The first guess comes from
the NCEP global final analysis system (FNL), passed through the WRF-WPS and real
programs.
To run WRF-3D-Var, first create and cd to a working directory, for example,
WRFDA/var/test/tutorial, and then follow the steps below:
> cd WRFDA/var/test/tutorial
> ln -sf WRFDA/run/LANDUSE.TBL ./LANDUSE.TBL
> ln -sf $DAT_DIR/rc/2008020512/wrfinput_d01 ./fg (link first guess file as fg)
> ln -sf WRFDA/var/obsproc/obs_gts_2008-02-05_12:00:00.3DVAR ./ob.ascii (link OBSPROC
processed observation file as ob.ascii)
> ln -sf $DAT_DIR/be/be.dat ./be.dat (link background error statistics as be.dat)
> ln -sf WRFDA/var/da/da_wrfvar.exe ./da_wrfvar.exe (link executable)
We will begin by editing the file, namelist.input, which is a very basic namelist.input
for running the tutorial test case is shown below and provided as
WRFDA/var/test/tutorial/namelist.input. Only the time and domain settings need
to be specified in this case, if we are using the default settings provided in
WRFDA/Registry/Registry.wrfvar)
&wrfvar1
print_detail_grad=false,
/
&wrfvar2
/
&wrfvar3
/
&wrfvar4
/
&wrfvar5
/
&wrfvar6
/
&wrfvar7
/
&wrfvar8
/
&wrfvar9
/
&wrfvar10
/
&wrfvar11
/
&wrfvar12
/
&wrfvar13
/
&wrfvar14
/
&wrfvar15
WRF-ARW V3: User’s Guide 6-14