WRF ARW User's Guide - MMM - UCAR

WRF-VAR
Before running obsproc.exe, create the required namelist file namelist.obsproc (see
WRFDA/var/obsproc/README.namelist, or the section Description of Namelist Variables
for details).
For your reference, an example file named “namelist_obsproc.3dvar.wrfvar-tut”
has already been created in the var/obsproc directory. Thus, proceed as follows.
> cp namelist.obsproc.3dvar.wrfvar-tut namelist.obsproc
Next, edit the namelist file namelist.obsproc by changing the following variables to
accommodate your experiments.
obs_gts_filename='obs.2008020512'
time_window_min = '2008-02-05_11:00:00',: The earliest time edge as ccyy-mm-dd_hh:mn:ss
time_analysis = '2008-02-05_12:00:00', : The analysis time as ccyy-mm-dd_hh:mn:ss
time_window_max = '2008-02-05_13:00:00',: The latest time edge as ccyy-mm-dd_hh:mn:ss
use_for = '3DVAR', ; used for 3D-Var, default
To run OBSPROC, type
> obsproc.exe >&! obsproc.out
Once obsproc.exe has completed successfully, you will see an observation data file,
obs_gts_2008-02-05_12:00:00.3DVAR, in the obsproc directory. This is the input observation
file to WRF-Var.
obs_gts_2008-02-05_12:00:00.3DVAR is an ASCII file that contains a header section
(listed below) followed by observations. The meanings and format of observations in the
file are described in the last six lines of the header section.
TOTAL = 9066, MISS. =-888888.,
SYNOP = 757, METAR = 2416, SHIP = 145, BUOY = 250, BOGUS = 0, TEMP =
86,
AMDAR = 19, AIREP = 205, TAMDAR= 0, PILOT = 85, SATEM = 106, SATOB =
2556,
GPSPW = 187, GPSZD = 0, GPSRF = 3, GPSEP = 0, SSMT1 = 0, SSMT2 =
0,
TOVS = 0, QSCAT = 2190, PROFL = 61, AIRSR = 0, OTHER = 0,
PHIC = 40.00, XLONC = -95.00, TRUE1 = 30.00, TRUE2 = 60.00, XIM11 = 1.00, XJM11 =
1.00,
base_temp= 290.00, base_lapse= 50.00, PTOP = 1000., base_pres=100000.,
base_tropo_pres= 20000., base_strat_temp= 215.,
IXC = 60, JXC = 90, IPROJ = 1, IDD = 1, MAXNES= 1,
NESTIX= 60,
NESTJX= 90,
NUMC = 1,
DIS = 60.00,
NESTI = 1,
NESTJ = 1,
INFO = PLATFORM, DATE, NAME, LEVELS, LATITUDE, LONGITUDE, ELEVATION, ID.
SRFC = SLP, PW (DATA,QC,ERROR).
EACH = PRES, SPEED, DIR, HEIGHT, TEMP, DEW PT, HUMID (DATA,QC,ERROR)*LEVELS.
INFO_FMT = (A12,1X,A19,1X,A40,1X,I6,3(F12.3,11X),6X,A40)
SRFC_FMT = (F12.3,I4,F7.2,F12.3,I4,F7.3)
EACH_FMT = (3(F12.3,I4,F7.2),11X,3(F12.3,I4,F7.2),11X,3(F12.3,I4,F7.2))
#------------------------------------------------------------------------------#
…… observations ………
Before running WRF-Var, you may like to learn more about various types of data that
will be passed to WRF-Var for this case, for example, their geographical distribution, etc.
WRF-ARW V3: User’s Guide 6-9