[Wrf-users] Re: NARR with metgrid.exe (WPS)

[Sukanta Basu]

Hi Don,

Last week, I faced the same problem. Fortunately, I got some advice from
Michael Duda and Brandon Storm regarding this issue. Apparently, there are 2
options: 
(1) remove the description for SPECHUMD in Vtable (that's what you did). 
(2) add the following in METGRID.TBL

======================================
name=SPECHUMD
output=no
======================================

Hope this helps. I also found out that you don't need to run link_grib.csh
and ungrib.exe 4 times (for FIXED, 3D, SFC and FLUX files). You can run it
twice - once for Fixed (file-name 32km_output.AWIP32.fixed) and once for the
*.3D, *.sfc and *.flx files. 

I also needed to change p_top_requested to 10000 in namelist.input file (for
real.exe). 

Here is my namelist.wps:

&share
 wrf_core = 'ARW',
 max_dom = 1,
 start_date = '1999-10-22_00:00:00','2006-08-16_12:00:00',
 end_date   = '1999-10-24_00:00:00','2006-08-16_12:00:00',
 interval_seconds = 10800
 io_form_geogrid = 2,
 opt_output_from_geogrid_path = './',
 debug_level = 0
/

&geogrid
 parent_id         =   1,   1,
 parent_grid_ratio =   1,   3,
 i_parent_start    =   1,  31,
 j_parent_start    =   1,  17,
 s_we              =   1,   1,
 e_we              =  81, 112,
 s_sn              =   1,   1,
 e_sn              =  81,  97,
 geog_data_res     = '10m','5m','2m','30s',
 dx        = 12000,
 dy        = 12000,
 map_proj  = 'lambert',
 ref_lat   =  37.6486,
 ref_lon   = -96.7351,
 truelat1  =  30.0,
 truelat2  =  60.0,
 stand_lon = -98.0,
 geog_data_path = '/home/sbasu/WRF/WRFV2.2/DATA/geog/'
 opt_geogrid_tbl_path = 'geogrid/'
/

&ungrib
 out_format = 'WPS',
 prefix     = 'NARR',
/

&metgrid
 constants_name  = 'NARR_FIXED',
 fg_name         = 'NARR',

Best regards,
Sukanta

Sukanta Basu
Assistant Professor
Texas Tech University
Ph: 806-742-1139
www.atmo.ttu.edu/basu

-----Original Message-----
From: wrf-users-bounces at ucar.edu [mailto:wrf-users-bounces at ucar.edu] On
Behalf Of Don Morton
Sent: Saturday, February 10, 2007 8:13 PM
To: wrf-users at ucar.edu
Subject: [Wrf-users] Re: NARR with metgrid.exe (WPS)

On 2/11/07, Don Morton <Don.Morton at umontana.edu> wrote:
>
>  WRF_DEBUG: Warning DIM             4 , NAME num_metgrid_levels
> REDIFINED  by var SPECHUMD            30           29  in wrf_io.F90
> line         2349
> ERROR: Error in ext_pkg_write_field

Well, somewhat blindly jumping in, I just decided to remove the
SPECHUMD line from Vtable.NARR, since I was getting a bunch
of warnings about it, anyway, and I couldn't figure out how to get SPECHUMD
to stop re-defining num_metgrid_levels.  The result is that metgrid.exe
appears to work flawlessly now, as does real.exe, and hopefully
wrf.exe will run successfully (it's sitting in a PBS queue right now).
I did an ncdump on the resulting wrfinput_d01 and can see that the
variables like QVAPOR have non-zero values, implying that the
model is getting moisture from someplace, even though I removed
SPECHUMD from the Vtable.

The question now is, am I insane for removing SPECHUMD from
Vtable.NARR?  Does this seem like a reasonable fix, or should I
be worried about something else?

Thanks,

Don

-- 
Don Morton
Department of Computer Science
The University of Montana - Missoula
http://www.cs.umt.edu/~morton/
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