Five methods to interpret field measurements of energy fluxes over a micro-sprinkler-irrigated mango orchard.
Teixeira A. H. de C., Bastiaanssen W. G. M.
Author Affiliation: Embrapa Semiárido, P.O. Box 23, Petrolina, PE 56302-970, Brazil.
Irrigation Science 30 : 13-28
Abstract : Energy balance measurements were carried out in a mango orchard during two growing seasons in the semi-arid region of Brazil. The actual evapotranspiration (ET) was acquired by eddy correlation (EC) and Bowen ratio energy balance (BR) techniques. The daily energy balance closure in the EC measurements showed an average gap of 12%, with a root mean square error (RMSE) of 1.7 MJ m-2 d-1. Three different correction procedures were tested for closing the energy balance from the EC system: (1) the surface energy balance residual method (RES), (2) the Bowen ratio determined from the EC fluxes, the combination approach (EC_BR), and (3) a new regression energy balance closure technique (REG). All closing energy balance methods presented good correlation with the direct EC measurements, but the trends were not similar. The latent heat fluxes estimated by the BR method-?EBR-were higher than those from the direct EC measurements-?EEC. When using the RES method, the half-hour ?EEC measurements represented around 88% of the ?