Biogenic to chemical mechanism assignments
VOC biogenic fluxes are assigned to the species of chemical mechanism
in module bio2name_chem_mech.F90
This module contains the subroutine bio2chem_mech which converts bio_emission_flux(bio_spec) to flux(mechanism_spec) in umol/(m^2 h).
bio_emission_flux(bio_spec) is calculated in subroutine compute_bio_emission_flux.F90 and has the units ugC/(m^2 h).
SAPRC90 conversion
- each SAPRC90 species receive from one bio species
- bio_emission_flux is converted from ugC/(m^2 h) in ug/(m^2 h) using a conversion factor (=molecular_mass_bio_specie/mass_C_bio_specie) and then in umoles/(m^2 h) by dividing with molecular_mass(mechanism_spec)
CBIV conversion
- CBIV species receive from two or more biogenic species PAR and OLE (CBIV species) has contributions from two bio species: monoterpenes and ovoc.
- isoprene is assigned to ISOP and follows the SAPRC90 conversion rule
- monoterpenes are assigned to 6.75PAR and 1.5OLE with the SAPRC90 conversion rule
- 1kg-C OVOC contains 16.451 moles PAR,3.09 OLE, etc (see module bio2cbiv.F90). Therefore, first OVOC flux is converted from ugC/(m^2 h) in kg-C/(m^2 h) with a factor 10^(-9) and then is calculted the corresponding flux of PAR (etc) in moles/(m^2 h).The flux of PAR is further converted in umoles/(m^2 h) by a factor 10^6. At the end, bio_emission_flux ugC/(m^2 h) is transfered in flux PAR umoles/(m^2 h) with the conversion factor 16.451*10^(-9)*10^6=16.451*10^(-3)