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Estimate of evapotranspiration in eastern Amazonia using SEBAL

2013; Volume: 56; Issue: 1 Linguagem: Inglês

10.4322/rca.2013.001

2177-8760

P. P. B. Ferreira, Adriano Marlisom Leão de Sousa, Maria Isabel Vitorino, Everaldo Barreiros de Souza, Paulo Jorge Oliveira Pontes de Souza,

Solar Radiation and Photovoltaics

In this study, we analyzed the estimates of evapotranspiration (ET) and sensible heat flux (H) using the Surface Energy Balance Algorithm for Land (SEBAL) for the 'Caxiuana' National Forest located in the municipality of Melgaço, State of Para, Brazil.To this end, we studied orbital images (Acqua/MODIS) combined with observational data from the LBA Project (Experiment of large-scale biosphere-atmosphere in the Amazon) collected in 2008 at the micrometeorological tower located in this forest.Although evapotranspiration was higher in the dry season and lower in the rainy season, it maintained a high rate throughout the year, with an average value very similar to those reported in the literature on the Amazon.The estimated daily ET was overestimated for the rainy season and underestimated for the dry season, but presented maintenance of high rates, just as the observed daily ET.The results also suggest that, because the evapotranspiration was higher in the dry season, the previous season (rainy season) was decisive, being possible to infer that, on the dry season, transpiration is the main source for the regional ET, which, in turn, is linked to the primary production of forests.