Energy balance measurements over a banana orchard in the Semiarid region in the Northeast of Brazil

Pesquisa Agropecuária Brasileira

Carlos Antonio Costa Dos Santos²  Bernardo Barbosa Da Silva²  Tantravahi Venkata Ramana Rao¹  Christopher Michael Usher Neale¹ 

[1] ,Instituto Nacional de Pesquisas da AmazôniaManaus AM ,Brazil

关键词: Musa;    dry season;    eddy covariance;    latent heat flux;    sensible heat flux;    wet season;    Musa;    estação chuvosa;    correlações turbulentas;    calor latente;    calor sensível;    estação seca;   

DOI  :  10.1590/S0100-204X2009001100001

来源: SciELO

【 摘 要 】

The objective of this work was to evaluate the reliability of eddy covariance measurements, analyzing the energy balance components, evapotranspiration and energy balance closure in dry and wet growing seasons, in a banana orchard. The experiment was carried out at a farm located within the irrigation district of Quixeré, in the Lower Jaguaribe basin, in Ceará state, Brazil. An eddy covariance system was used to measure the turbulent flux. An automatic weather station was installed in a grass field to obtain the reference evapotranspiration (ET0) from the combined FAO-Penman-Monteith method. Wind speed and vapor pressure deficit are the most important variables on the evaporative process in both growing seasons. In the dry season, the heat fluxes have a similar order of magnitude, and during the wet season the latent heat flux is the largest. The eddy covariance system had acceptable reliability in measuring heat flux, with actual evapotranspiration results comparing well with those obtained by using the water balance method. The energy balance closure had good results for the study area, with mean values of 0.93 and 0.86 for the dry and wet growing seasons respectively.

【 授权许可】

CC BY   
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