Abstract

MENDONCA, José Carlos et al. Estimative of sensible heat flux (H) in North Fluminense region, RJ, using MODIS products and SEBAL algorithm. Rev. bras. meteorol. [online]. 2012, vol.27, n.1, pp. 85-94. ISSN 0102-7786.  http://dx.doi.org/10.1590/S0102-77862012000100009.

Images from the MODIS and SEBAL algorithm were used to evaluate two proposals for estimating sensible heat flux (H) based on the selection of anchor pixels used to determine the surface temperature difference (dT). The proposition in which pixels with extreme temperatures were used was called H-CLASSIC. The other one H-PESAGRO adopted for cold pixels the lowest temperature and for the hot pixels the value of H as a residue of the equation of Penman-Monteith FAO 56, using observed data from agrometeorological station. The results showed that the H-PESAGRO required a smaller number of interactions for the stabilization of the aerodynamic resistance (r_ah) values. H- CLASSIC estimated values were 58.35% higher than the estimated by H-PESAGRO. The estimated H values using Bowen ratio when compared with the sugar cane pixels presented correlation coefficients of r = 0.54 and r = 0.71 for the Propositions H-CLASSIC and H-PESAGRO, respectively.

Keywords : remote sensing; energy balance; agrometeorology; SEBAL.