This update restores dry and wet deposition for non-gas (aerosol) species in GEOS-Chem chemical mechanism.
This bug was likely introduced due to:
1) update in the species list leading to a new way to generate the species lists which inadvertently removed the non-gas species from <gas_wetdep_list> and <drydep_list>. (more on this later), and
2) update in the MCT -> NUOPC transition to remove the Fritz et al. approach of performing deposition for aerosols in a manner similar to HNO3, which was originally coded in seq_drydep_mod.F90 (in mct, now removed) and mo_neu_wetdep.F90 (changes removed for some reason)
This update restores:
1) the aerosol species into the dry and wet deposition lists. Note: for some reason, the aerosols currently go into the gas-phase lists. This was how it was always done; the repercussions are unknown but the aer_ lists are all MAM4-species, and the deposition is handled within aero_model. I suspect they won't work if they're put into the aerosol list, so we maintain the old approach.
2) <dep_data_file> which uses the appropriate parameters and coefficients for aerosol species in dry and wet deposition, and uses parameters from HNO3 if otherwise not available. Complimentary repository and commit to the updated <dep_data_file> generation is here: https://github.com/CESM-GC/drydep_henrys_law_nc/commit/a9f85e4abb4b274a533a768ebbe068487576c921
The results of this update have been verified to lead the model to much better simulate nitrate aerosol, and NOx levels compared to the offline GEOS-Chem simulation and better reproduce NOx levels compared to observations.
This update restores dry and wet deposition for non-gas (aerosol) species in GEOS-Chem chemical mechanism.
This bug was likely introduced due to: 1) update in the species list leading to a new way to generate the species lists which inadvertently removed the non-gas species from
<gas_wetdep_list>and<drydep_list>. (more on this later), and 2) update in the MCT -> NUOPC transition to remove the Fritz et al. approach of performing deposition for aerosols in a manner similar to HNO3, which was originally coded inseq_drydep_mod.F90(in mct, now removed) andmo_neu_wetdep.F90(changes removed for some reason)This update restores: 1) the aerosol species into the dry and wet deposition lists. Note: for some reason, the aerosols currently go into the gas-phase lists. This was how it was always done; the repercussions are unknown but the
aer_lists are all MAM4-species, and the deposition is handled withinaero_model. I suspect they won't work if they're put into the aerosol list, so we maintain the old approach. 2)<dep_data_file>which uses the appropriate parameters and coefficients for aerosol species in dry and wet deposition, and uses parameters from HNO3 if otherwise not available. Complimentary repository and commit to the updated<dep_data_file>generation is here: https://github.com/CESM-GC/drydep_henrys_law_nc/commit/a9f85e4abb4b274a533a768ebbe068487576c921The results of this update have been verified to lead the model to much better simulate nitrate aerosol, and NOx levels compared to the offline GEOS-Chem simulation and better reproduce NOx levels compared to observations.