sum_of_clm_tech_note/CLM50_Tech_Note_Fluxes/2.5.4.-Update-of-Ground-Sensible-and-Latent-Heat-Fluxesupdate-of-ground-sensible-and-latent-heat-fluxes-Permalink-to-this-headline.sum.md

Summary of "Update of Ground Sensible and Latent Heat Fluxes":

2.5.4. Update of Ground Sensible and Latent Heat Fluxes

• The sensible and water vapor heat fluxes derived previously are based on the ground surface temperature from the previous time step (T_g^n).
• These fluxes are used as the surface forcing for the solution of the soil temperature equations, which yields a new ground surface temperature (T_g^(n+1)).
• The ground sensible and water vapor fluxes are then updated for T_g^(n+1) using the partial derivatives of the fluxes with respect to the ground temperature.
• If the soil moisture in the top snow/soil layer is not sufficient to support the updated ground evaporation, the ground evaporation is adjusted accordingly.
• Any resulting energy deficit is assigned to the sensible heat flux.
• The updated ground water vapor flux is partitioned into evaporation of liquid water, sublimation from snow/ice, liquid dew, or frost, which are accounted for in the snow hydrology and hydrology calculations.
• The ground heat flux is calculated as the difference between the solar and longwave radiation absorbed by the ground, and the sensible and latent heat fluxes.
• The system balances energy, with the sum of all terms equal to zero.