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## Fire Trace Gas and Aerosol Emissions in CESM2

- CESM2 is the first Earth system model that can fully couple fire, fire emissions, land, and atmosphere.
- The land component CLM5 calculates surface trace gas and aerosol emissions from fire, as inputs for the atmospheric chemistry and aerosol models.
- Emissions for a trace gas or aerosol species x and plant functional type (PFT) j are calculated as:
  E_x,j = EF_x,j * (phi_j / [C])
  Where EF_x,j is the PFT-dependent emission factor, phi_j is the PFT-dependent combustion factor, and [C] is a conversion factor.
- Emission heights are PFT-dependent, ranging from 1 km for grasses/crops to 4.3 km for needleleaf trees.
- The article provides a table of PFT-specific combustion completeness and fire mortality factors for various carbon pools (leaves, stems, roots, etc.).

In summary, CESM2 models the complete fire-land-atmosphere coupling, with CLM5 calculating trace gas and aerosol emissions from fire based on PFT-dependent parameters, which are then used by the atmospheric components.