LITTLE_R Tutorial : Run
First edit the namelist.input
file
- It is already set up to run the SOC case, except for the
input file locations for REGRID output and observations.
- Other highlighted namelist variables are the basic ones you
need to modify when you work on a different case.
- For a complete description of the namelist variables, please
see section 6.13 in Chapter
6 of the Tutorial Notes.
Once you've changed it, type the following to run:
little_r >& log
If you are successful, you should find these additional files
generated in the directory:
-rw-r--r-- 1 mesouser users 2177888 Jan 6 08:43
LITTLE_R_DOMAIN1
-rw-r--r-- 1 mesouser users
6899 Jan 6 08:43 log
- LITTLE_R_DOMAIN1 is the binary output file from LITTLE_R,
and will be the input file for INTERPF.
- It contains 3-D pressure level analyses of winds, temperature,
RH, geopotential height, and sea level pressure.
- The log
file contains all print statements generated by LITTLE_R, and
this is the file you should take a closer look at if your LITTLE_R
job fails. Near the end of the log file, you should see the
following line if the job finished correctly:
STOP 99999
If you set the variable "print_obs_files" (&record5
in the namelist.input file), to TRUE, the following files will
also be generated (these are needed if you later want to run either
plot_level or plot_soundings):
-rw-r--r-- 1
mesouser users 235144 Jan 6 08:41 discard_out_1993-03-13_00:00:00.0000
-rw-r--r-- 1 mesouser users 675535 Jan 6 08:42 obs_used_for_oa_out_1993-03-13_00:00:00.0000
-rw-r--r-- 1 mesouser users 682370 Jan 6 08:42 plotobs_out_1993-03-13_00:00:00.0000
-rw-r--r-- 1 mesouser users 1462487 Jan 6 08:41 qc_out_1993-03-13_00:00:00.0000
-rw-r--r-- 1 mesouser users 1818819 Jan 6 08:41 result_out_1993-03-13_00:00:00.0000
-rw-r--r-- 1 mesouser users 1507025 Jan 6 08:41 useful_out_1993-03-13_00:00:00.0000
These
files are ASCII text files which detail
the actions taken on observations through a time cycle of the
program.
If you choose to do FDDA (f4d=.true., &record7),
you should find these additional files generated in the directory:
-rw-r--r-- 1
mesouser users 543968 Jan 6 08:28 SFCFDDA_DOMAIN1
-rw-r--r-- 1 mesouser users 86504 Jan 6 08:25 discard_out_sfc_fdda_1993-03-13_00:00:00.0000
-rw-r--r-- 1 mesouser users 275219 Jan 6 08:25 obs_used_for_oa_out_sfc_fdda_1993-03-13_00:00:00.0000
-rw-r--r-- 1 mesouser users 279198 Jan 6 08:25 plotobs_out_sfc_fdda_1993-03-13_00:00:00.0000
-rw-r--r-- 1 mesouser users 657025 Jan 6 08:25 qc_out_sfc_fdda_1993-03-13_00:00:00.0000
-rw-r--r-- 1 mesouser users 850384 Jan 6 08:25 result_out_sfc_fdda_1993-03-13_00:00:00.0000
-rw-r--r-- 1 mesouser users 692900 Jan 6 08:25 useful_out_sfc_fdda_1993-03-13_00:00:00.0000
- The log
file in this case will include statements to the generation
of the SFCFDDA_DOMAIN1 file.
- SFCFDDA_DOMAIN1 contains surface analyses and a count of observations
within 250 km of each grid point.
- The ASCII files in this case is similar to the ones generated
for the run without FDDA.
Plot Utilities:
Since version 3.5, LITTLE_R provides two utility programs for
plotting observations. These programs are called "plot_soundings"
and "plot_level". These optional programs use NCAR Graphics,
and are built automatically if the PROGS option in the top-level
Makefile is set to $(I_HAVE_NCARG). Both programs prompt
the user for additional information.
plot_soundings : This program generates soundings from
either the quality-controlled ("qc_out_yyyy-mm-dd_hh:mm:ss:ffff")
or the non-quality-controlled ("useful_out_yyyy-mm-dd_hh:mm:ss:ffff")
upper-air data. Only the data that are on the requested
analysis levels are processed. The program asks the user
for an input filename, and creates the file "sounding.cgm".
plot_level : This program creates station plots for
each analysis level. These plots contain both observations that
have passed all QC tests and observations that have failed the
QC tests. Observations that failed the QC tests are plotted
in various colors according to which test was failed.
The program prompts the user for a date in the form yyyymmddhh,
and creates the file "levels.cgm".
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To check whether your
output files are correct (LITTLE_R_DOMAIN1), you can run
RIP / GRAPH
if you have NCAR Graphics on your machine, or the MM5toGrADS
converter if you have GrADS on your machine. |
You can now move to the next program: INTERPF.
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