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The use of scintillometers to determine sensible heat fluxes is now common instudies of land-atmosphere interactions. The main interest in theseinstruments is due to their ability to quantify energy distributions at thelandscape scale, as they can calculate sensible heat flux values over longdistances, in contrast to Eddy Covariance systems. However, scintillometerdata do not provide a direct measure of sensible heat flux, but requireadditional data, such as the Bowen ratio (β), to provide flux values.The Bowen ratio can either be measured using Eddy Covariance systems orderived from the energy balance closure. In this work, specific requirementsfor estimating energy fluxes using a scintillometer were analyzed, as well asthe accuracy of two flux calculation methods. We first focused on theclassical method (used in standard softwares) and we analysed the impact ofthe Bowen ratio on flux value and uncertainty. For instance, an averagedBowen ratio (β) of less than 1 proved to be a significant source ofmeasurement uncertainty. An alternative method, called the "β-closuremethod", for which the Bowen ratio measurement is not necessary, was alsotested. In this case, it was observed that even for low β values, fluxuncertainties were reduced and scintillometer data were well correlated withthe Eddy Covariance results. Besides, both methods should tend to the sameresults, but the second one slightly underestimates H while βdecreases (<5%)

Uncertainty analysis of computational methods for deriving sensible heat flux values from scintillometer measurements