[Wrf-users] Facing problems with real.exe (evert, p_top, max_dz)

[Dominikus Heinzeller]

Hi Jose,

why do you try to use the same number of vertical levels in your WRF runs as in the HadGEM2-ES input data? Try to set e_vert to something reasonable, i.e., for a 50hPa model top use something around 40.

By the way, the HadGEM2-ES data on the ESGF nodes has 17 pressure levels (for variable zg), other variables are on 38 model levels (hybrid height coordinate).

Cheers

Dom
 
> On 25/11/2014, at 2:18 pm, Jose Augusto Paixão Veiga <veiga.uea at gmail.com> wrote:
> 
> Dear users,
> 
> I am forcing WRF (version 3.5) with HadGEM-2 data and in my small test with 36 hours I've successfully built the met_em_d* files during the pre-processing.  However, I've been failing to create the appropriate boundary conditions to further run the model.
> 
> The error message bellow arises as soon as I run the real.exe program:
> 
> 
>  Using sfcprs  to compute psfc
>  d01 2005-03-01_00:00:00 You need one of three things:
>  d01 2005-03-01_00:00:00 1) More eta levels to reduce the dz: e_vert
>  d01 2005-03-01_00:00:00 2) A lower p_top so your total height is reduced: p_top_requested
>  d01 2005-03-01_00:00:00 3) Increase the maximum allowable eta thickness: max_dz
>  d01 2005-03-01_00:00:00 All are namelist options
>  -------------- FATAL CALLED ---------------
>  FATAL CALLED FROM FILE:  <stdin>  LINE:    5779
>  dz above fixed eta levels is too large
>  -------------------------------------------
> [0] MPI Abort by user Aborting program !
> [0] Aborting program!
> 
> 
> As 18 is the number of HadGEM-2 levels, I've testing different e_vert values in the namelist.input file (ex: 19, 20,....22) but the error still persisted. I've get attached the namelist.input file for some check.  
> 
> So, after some frustrating tests with e_vert I've decided to chance ptop values, but the error message persist. The only case I successfully run real.exe was after have set ptop=50000 (500 hPa) which does not fit my needs.       
> 
> I didn't test with max_dz as I had not find where it is to be modified. 
>  
> So, I really appreciate if someone could help me on this issue.
> 
> 
> José Augusto P. Veiga, 
> 
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