The dispersive fluxes are a spatial analogy to the standard Reynolds decomposition using time averages. They provide spatial correlation of the time-averaged fluxes and allow to quantify exchange of energy that are not governed by turbulent motions. This framework has been extensively used to study canopy flows (Finnigan, 2000).
This contribution evaluates the role of dispersive fluxes on the surface energy balance using large-eddy simulations of the atmospheric boundary layer in neutral conditions over heterogeneous surface conditions. The surfaces studied are composed of patches of different sizes and different temperatures. Dispersive fluxes are compared to the turbulent fluxes and show a non-negligible contribution to the transport of heat. Hence, results suggest that the dispersive fluxes provide a representation of surface heterogeneity that otherwise would not appear in the advection process.