Running real.exe

[Sreyashi Debnath]

Hello everyone,

I have few doubts regarding execution of real.exe which I am listing below: 

1. Before running anthro_emiss, fire_emiss and mozbc, is it essential to execute real.exe?

2. Is there any particular order of executing real.exe and the emissions?

3. For an instance, if I have executed real.exe and prepared the emissions but due to some reason, wrf.exe shows some error while running thus urging me to make changes in the namelist.input file and execute again real.exe, is it necessary to also execute again the emissions i.e. anthro, fire, megan etc and Mozbc after the success of real.exe?

4. While executing real.exe before anthro_emiss, fire_emiss and mozbc, what value should I set for io_form_auxinput5, io_form_auxinput6 and io_form_auxinput7in the namelist? 0 or 2 (2 being for netcdf file)? If 0, shall I change it back to 2 after the creation of wrfchem*, wrffirechem*, wrfbiochem*, wrfbdy*, wrfinput* etc. files?

Can anyone please help me in resolving the doubts.?

Thanks and regards,

Sreyashi Debnath

JRF, IITM, Pune, India

[Indranil Nandi]

1. Yes it is. Primarily after setting all the namelist option according to your choice and making the chem_opt=0 you have to run the real.exe which will build the body and input files. These files will help the emission utility programme for building the emissions according to your domain and simulation time.

Mozbc programme will help to setup the chemical boundary condition of wrf_chem model. You have to run this programme in the last step means after the second real.exe execution. After running the mozbc programme you will findout that the body and input files are modified. 

2. Set the namelist setting - run real.exe (chem_out=0) - build the emissions using emission utility programs and transfer the files to em_real - again run real.exe (chem_opt=your choice)-run mozbc programme - run wrf.exe.

3. If you are making changes in &Chem part then just only run real.exe then mozbc thn wrf.exe.

But if you are making some mojor changes it &Phys or entity are domain specified setting then it is better to prepare again the emissions as otherwise you may fase some serious run time errors. 

4. In the first real.exe execution you are making the chem_opt=0 it means no chemistry component will encountered in that real run so the io options will not force you to any error message. It is better to keep them 2 all time. Just make the chemistry on of using the chem_opt option. 

Please let us know if any of your doubts are missed to answer.

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[Sreyashi Debnath]

Thank you so much sir for the detailed suggestions. I am definitely going to follow this chronological order.

Regards,

Sreyashi