NESTDOWN Tutorial : Run
First edit the namelist.input
file
- It is partially set up to run the SOC case (dates only).
- Other highlighted namelist variables are the typical ones
you need to modify when you work on a different case.
- In this example, we assume that we will be doing a one-way
MM5 run at 10 km resolution after we've done the 90/30 km run.
- We assume that we have MM5 model output at 1 hour interval,
and we would like to create initial and boundary condition files
at 10 km (require TERRAIN_DOMAIN3 at 10 km - a user may rerun
TERRAIN to include this domain).
- The 10 km run (because of its small domain size)
will be run for 3 hours only and from hour 3 to hour 6 of the
90/30 km run.
- For a complete description of the namelist variables, please
see Chapter
10 of the Tutorial Notes.
Once you've changed it, type the following to run:
nestdown>& log
If you are successful, you should find these additional files
generated in the directory:
-rw-r--r--
1 mesouser system 4749176 Apr 5 13:21 BDYOUT_DOMAIN3
-rw-r--r-- 1 mesouser system 134920
Apr 5 13:21 LOWBDY_DOMAIN3
-rw-r--r-- 1 mesouser system 2130712 Apr
5 13:20 MMINPUT_DOMAIN3
-rw-r--r-- 1 mesouser system
7031 Apr 5 13:21 log
- Similar to output from INTERPF,
MMINPUT_DOMAIN3 is the binary initial condition file for MM5,
and it contains 3-D wind, temperature, mixing ratio,
vertical motion and perturbation pressure fields on model sigma
levels.
- BDYOUT_DOMAIN3 and LOWBDY_DOMAIN3 are lateral boundary condition
and lower boundary condition files for MM5.
- The log
file contains all print statements generated by NESTDWON, and
again if anything goes wrong, this is the first place to look
for clues. Near the end of the log file, you should see the
following line if the job is finished correctly:
STOP 99999
|
There is no plot file generated from NESTDOWN.
To check whether your input files are correct (MMINPUT_DOMAINx/LOWBDY_DOMAINx),
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 cannot plot the data in the BDYOUT_DOMAINx file. |
|
|
If everything checks out ok, then your attempt
to run NESTDOWN should be a successful one.
You are now ready to run MM5 model again. Remember,
when you copy or move these files to MM5/Run directory,
you need to name all files with suffix X_DOMAIN1, since
to MM5, this domain will be the first domain.
If you still have old files (MM5 input and output)
in the MM5/Run directory, save them same place else first
before you move the new input files to this directory as
old the older files will be overwritten by the new files. |
|
