The correction rate of evaporation measurements above a forest due to forest edge effects, is estimated. High frequency sonic anemometer and slow frequency measurements close above the canopy and near the forest edge are analysed for a possible influence of advection of sensible and latent heat.
The small patch of Japanese Larch (Larix Kaempferi) under study lies on the edge of a heterogeneous forest in the north east of the Netherlands, adjacent to a large bog area. The gap in the energy balance shows a clear dependence on wind direction. This can be explained by advection of sensible and latent heat fluxes, and a change in diffusivity near the forest boundary, causing higher local fluxes.
The surface model of Klaassen (1992) and eddy correlation measurements above the bog and the forest patch are used to simulate the advection, and to execute a sensitivity-analysis on the involved physical factors.