Stomatal resistance No stomatal resitance Latent heat flux : surface --> the lowest model layer Stomatal resitance Latent heat flux : surface --> vegetation --> the lowest model layer Daytime : Shortwave radiation flux is large. Evapotranspiration is active. Latent heat flux is large. Nighttime : Shortwave radiation flux is small. Evapotranspiration is inactive. Latent heat flux is small.