Issue with mapping coarse and fine PM in MOZART-MOSAIC

[sne...@gmail.com]

Hi all,

I used epa_anthro_emis to prepare anthropogenic emissions and use them as inputs for WRF-Chem runs with MOZART-MOSAIC chemistry (chem_opt 201). I use the sample input file, which works with both GOCART and MOSAC aerosol schemes: https://www.acom.ucar.edu/wrf-chem/anthro_emis_MOZCART-T1_EPA2017_web.inp

However, when I read the WRF-Chem source code (https://github.com/wrf-model/WRF/blob/master/chem/module_mosaic_addemiss.F, line 478), it appears that MOSAIC needs "e_pm25i" and "e_pm25j" separately. But in the input file, there is one PM25 variable:

"emis_map(25) = 'PM_25(A)->all(PMOTHR)+cmv_c3_12(PMOTHR)+othpt(PMOTHR)+ptegu(PMOTHR)+cmv_c1c2_12(PMOTHR)+pt_oilgas(PMOTHR)+ptnonipm(PMOTHR)+rwc(PMOTHR)'"

Would someone please confirm how I should map PM2.5 emissions for use with the MOSAIC scheme? Do I need to split it into PM25I and PM25J?

Also, I noticed that when I add species in the emission map as fine aerosols (J-mode), WRF-Chem reads it with no issues. This results in reasonable concentrations of the species in size bins 1 to 3. However, when I read the same emission as coarse aerosols (C-mode) the concentrations are near zero in the last size bin (a04), and other size bins. While, according to the MOSAIC source code, I was expecting to see all of the concentrations in the last size bin.

Does anyone know why this happens for the coarse size aerosols (bin a04)?

 

Thank you,

Soroush