WRF-CHEM¶
This document provides an overview of the WRF-Chem-specific features of WRF-ensembly.
Initial conditions¶
The behaviour of real.exe and wrf.exe regarding the atm. composition initial condition is controlled by the chem_in_opt option in the &chem namelist.
If this is set to 1:
real.exewill attempt to read the initial conditions fromwrf_chem_inputfiles (not sure exactly what happens) and will do weird things if they are not present.wrf.exewill read the initial conditions fromwrfinput_d01files as every other variable.
And if this is set to 0:
- real.exe will not read the initial conditions from wrf_chem_input and will write empty fields in wrfinput_d01.
- wrf.exe will not read initial conditions for the chemistry fields.
Thus, if you are using interpolator-for-wrfchem to add initial conditions on already prepared wrfinput_d01 files, you should set chem_in_opt to 0 for real.exe and 1 for wrf.exe. This way, real.exe will not try to read the initial conditions from wrf_chem_input and will write empty fields in wrfinput_d01, while wrf.exe will read the initial conditions from wrfinput_d01 as every other variable.
To automate this behaviour, you can set manage_chem_in to true in your config.yml file (section data). This will automatically set chem_in_opt to the appropriate value depending on whether you are running real.exe or wrf.exe. If you set this to false, you will have to manually set chem_in_opt in your namelist.input file.