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Micrometeorological methods to estimate sugarcane evapotranspiration in coastal northeastern region of Brazil

Adolpho Emanuel Quintela da Rocha, José Leonaldo de Souza, Guilherme Bastos Lyra, Ricardo Araújo Ferreira Junior, Gustavo Bastos Lyra, Laurício Endres, Marshall Victor Chagas Santos
2019 Australian Journal of Crop Science  
The aim of the present work was to evaluate the performance of Bowen ratio-energy balance method, as well as the energy balance closure by Eddy covariance technique for a sugarcane crop in Brazilian northeastern region. Micrometeorological measurements were carried out between June 7th and November 17th, 2013. Latent and sensible heat fluxes were determined through Eddy covariance technique (EC) and by the Bowen ratio-energy balance method (BREB), considering two approaches. The first,
more » ... The first, estimated the air temperature and water vapour pressure gradient in two levels above the canopy. The second method measured the air temperature and water vapour pressure at the first level and the surface temperature from radiometric measurements. Latent heat flux was also estimated as energy balance residue from determinations of the sensible heat flux by Eddy covariance. The degree of energy balance closure was dependent on the time of the day considered. Bowen ratio - energy balance estimated from the first approach, showed the best agreement with the eddy covariance measurements to estimate latent heat flux, while in the second case, when the Bowen ratio was estimated using the surface temperature, the linear relationship was the most discrepant. Therefore, the Bowen ratio conventional method is more suitable for estimating latent heat flux in sugarcane.
doi:10.21475/ajcs.19.13.09.p1257 fatcat:vha6elf27zbjbgsp3ba2uclmxi