Viral Shah

It should refer to the fixed oxidants in the `Hg.eqn` file, but it seems that KPP is trying to read the `fullchem.eqn` file, where H2 is the first fixed species....

I could add the metadata for these diagnostic species to species_database.yml. However, I am not sure if we need to include all of these P/L diagnostics in the standard code....

@arifein we could just define production and loss families in `KPP/Hg/gckpp.kpp` as follows: ``` #FAMILIES LHg0 : Hg0 + HgBr + HgOH + HgCl; {gross Hg2 production} PHg0 : Hg0...

Thank you @arifein. This looks good to me. I thought you would have had to add the prod and loss species to the species_database.yml file. I guess that's not needed...

Thanks for pointing this out @arifein. I have uploaded a new species_database file that include the Is_Hg2 and Is_HgP attributes in #1286.

@CharikleiaGRN The lower deposition is indeed due to lower emissions. Also, it would be best to spin up the model for a minimum of two years to minimize the influence...

@yantosca: Here is a species database file that includes tags for the Hg2 and HgP species. [species_database.txt](https://github.com/geoschem/geos-chem/files/8969918/species_database.txt)

@yantosca, `Hg0_id_list`, `Hg2_id_list` and `HgP_id_list` were used only for the tagged Hg simulation. I had commented them out everywhere they appeared.

@arifein, the units for the `EmisHg2ClP_Anthro` in HEMCO_Diagn.rc should indeed be `kg/m2/s`. Regarding the allocation of HgP emissions, I had assigned all HgP emissions to HgCl2(g) and allowed the Hg(II)...

I agree with @barronh, that the names of the YAML tags are confusing. It would be better to call them `NITs_Jscale` and `NIT_Jscale` since they are mapped to `Input_Opt%hvAerNIT_JNITs` and...