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Single Column Simulation with CCLM

Added by Eva Nowatzki 7 months ago

Dear all,
I am planning to do single column simulations with CCLM 5.0.
Now I am wondering whether there is a maximum number of grid cells needed.

When I choose my domain for example to be 9x9 grid cells there comes the following error in INT2LM:
ERROR in tautsp(), src_vert_interpol.f90: while processing j-index:

When I extend the domain a little bit, I get the following error in INT2LM:
Caught signal 8 (Floating point exception)
mxm_handle_error()

And when I extend my domain up to more then 20x20 grid cells without changing anything else it works fine.
Is there any namelist variable I have to change when using a smaller domain or is this not possible with CCLM?

Thank you very much for your help and best regards,
Eva


Replies (7)

RE: Single Column Simulation with CCLM - Added by Burkhardt Rockel 7 months ago

I am not aware of a single column version in the CLM-Community. Maybe there is one in the COSMO consortium?

RE: Single Column Simulation with CCLM - Added by Ulrich Schättler 7 months ago

There is a single column model from Matthias Raschendorfer, but this is not public and I don’t think that you used that. Maybe you configured the COSMO-Model in a way that it runs on a very small domain (9x9 grid points). Or what did you do exactly?

RE: Single Column Simulation with CCLM - Added by Eva Nowatzki 7 months ago

Yes, that is what I did. I run the model on a very small domain. But it only runs without errors when the domain is bigger than 20x20 grid points.

RE: Single Column Simulation with CCLM - Added by Ulrich Schättler 7 months ago

How do you control it? Is it an artificial data run? Or do you have initial and boundary data for it? Could you show us the namelist configuration (YUSPECIF)?

RE: Single Column Simulation with CCLM - Added by Eva Nowatzki 7 months ago

I use ERA-Interim as initial data. Here the YUSPECIF of my simulation. Thank you very much

YUSPECIF YUSPECIF 54.9 KB

RE: Single Column Simulation with CCLM - Added by Ulrich Schättler 7 months ago

Ok, I see one problem: You have ie_tot=je_tot=21 and nprocx=nprocy=24! I wonder that it works at all. Because this means that you distribute the 21x21=441 grid points to 24x24=576 processors.
You have to use nprocx=nprocy=1 , so only 1 CPU. Then it should also work with less grid points. You have nboundlines=3 (what you need for the dynamics), so can try to use ie_tot=je_tot=7. This is one grid point in the interior domain and 3 grid points of boundaries around.

I am sorry that I cannot help further, because this is my last day before I leave for 3 weeks of holidays. Good Luck!

RE: Single Column Simulation with CCLM - Added by Eva Nowatzki 7 months ago

Thank you so much for your help. I will try it that way. I wish you happy holidays!

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