This preprocessor was developed to facilitate the preparation of volcanic emissions (chem_opt=402, emiss_opt_vol=3) for the WRF-Chem v4.8 model.

scipy, netCDF4, xarray, matplotlib, pandas

The path to the WRF-Chem file with initial conditions ('wrfinput_d01', for example) is required. Please look over the provided 'example*.py' files and modify them to suit your requirements. After the script execution, the necessary adjustments in the namelist.input file will be shown. For instance:

&time_control
    auxinput13_interval_m = 10
    frames_per_auxinput13 = 85
    auxinput13_inname     = 'wrfchemv_d01.1991-06-15_01:40:00'
&chem
    chem_opt               = 402
    emiss_opt_vol          = 3

These settings mean that the prepared emission file 'wrfchemv_d01.1991-06-15_01:40:00' will be read by WRF-Chem 85 times, starting from the moment when the model time passes '1991-06-15 01:40:00'. During the run, the WRF-Chem model will read the data from the emission file at 10-minute intervals. Within each interval, the corresponding vertical distribution of emissions will be used.

If you used this utility in your work, please do not forget to cite it as follows: Ukhov, A., Stenchikov, G., Schnell, J., Ahmadov, R., Rizza, U., Grell, G., and Hoteit, I.: Enhancing volcanic eruption simulations with the WRF-Chem v4.8, Geosci. Model Dev., 18, 9805–9825, https://doi.org/10.5194/gmd-18-9805-2025, 2025.