The soil surface heat flux is calculated using a simplified resistance approach when a daily time resolution is used (i.e. if the “daily mean values”-option is chosen under “Run options” in Common Characteristics). The soil surface heat flux is then given by:
where the rsoil represents the integrated resistance of the uppermost 20 cm of the soil profile:
where ∆z is the thickness of the soil layers, and z is the mid-point of the soil layers.