WRF Chem_opt 202 Version 4.4 Issue: Warning Messages and Stuck Simulation

[Varun Katoch]

Dear All,

I hope this message finds you well. I am writing to address an issue encountered while running WRF Chem_opt 202 Version 4.4. It seems that the simulation is getting stuck, and warning messages are being generated. After investigating the issue, it appears that the warning message pertains to a large total longwave optical depth at a specific grid point. Below is a snippet of the warning message for reference:

WARNING: Large total lw optical depth of ******** at point i,j,nb=   10   38    2
Diagnostics 1: k, tauaerlw1, tauaerlw16
   1****************
   2****************
   3****************
   4****************
   5****************
   6****************
   7****************
   8****************
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  16****************
  1724855.84********
  1814095.61********
  19  654.12 4925.78
  20    0.18    1.47
  21    0.01    0.07
  22    0.00    0.00
  23    0.00    0.00
  24    0.00    0.00
  25    0.00    0.00
  26    0.00    0.00
  27    0.00    0.00
  28    0.00    0.00
  29    0.00    0.00
  30    0.00    0.00
  31    0.00    0.00
  32    0.00    0.00
  33    0.00    0.00
  34    0.00    0.00
  35    0.00    0.00
  36    0.00    0.00
  37    0.00    0.00
  38    0.00    0.00
  39    0.00    0.00

[Dr. Sahir Azmi]

My concern is also similar with chem_opt=202; 

model output is showing infinitely high values as: WARNING: large total sw optical depth of ******** at point diagnostics 1: k, tauaer300, tauaer400, tauaer600, tauaer999, tauaer

*******

*******

*******

This situation is making the model sometimes work and sometimes crash in between. How to avoid this? Any solution?

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[Dr. Sahir Azmi]

Anyone can give solution for this problem?

[Mary Barth]

Hello Sahir,

This question has come up before in our group emails. I suggest checking the archive to learn more.

I also suggest examining the aerosol concentration fields to learn what aerosol constituents are causing the high AOD values. Once you determine that then you can examine the initial concentrations, emissions and other production terms to see if there is an error in the input files or elsewhere.

Good luck,

Mary

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Mary Barth 

Senior Scientist   

phone: 303-497-8186    email: bar...@ucar.edu

NSF - National Center for Atmospheric Research

P.O. Box 3000

Boulder, CO 80307

Staff web page

SIMA Web Site

MUSICA Web Site

DC3 Web Site 

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[Varun Katoch]

Good morning Mary,

What about my issue?

[Dr. Sahir Azmi]

Hello Mary,

As you suggested, I searched for this topic in the archive of previous emails and discussions but couldn't find anything. Could you please pinpoint where I might find it or guide me through the discussion thread?

Thanks

[Mary Barth]

Hi there,

I'm sorry you couldn't find the archived emails related to this topic. 

However, the guidance is what I wrote in my second paragraph to you. Please check through the aerosol fields to look for high values.

Mary

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Mary Barth 

Senior Scientist   

phone: 303-497-8186    email: bar...@ucar.edu

NSF - National Center for Atmospheric Research

P.O. Box 3000

Boulder, CO 80307

Staff web page

SIMA Web Site

MUSICA Web Site

DC3 Web Site 

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