sum_of_clm_tech_note/CLM50_Tech_Note_Fire/2.24.5.-Fire-trace-gas-and-aerosol-emissionsfire-trace-gas-and-aerosol-emissions-Permalink-to-this-headline.sum.md

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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.