The turbulent transport of moisture, heat and CO2 between the vegetation and atmosphere behaves chaotic. It is therefore difficult to simulate this transport in models. Simplified models are used to simulate these exchange processes that take place in the lowest part of the atmosphere. However, are these land-atmosphere theories always valid? Can we adjust these theories to make them valid for more situations?
By comparing four of such theories with observations of the exchange of moisture, heat and CO2 above several crops, we test their applicability. Furthermore, we improve three of these theories. This supports other researchers, who study for example water resources, crop growth, and the climate, which are all relevant for the production of food and human health worldwide.