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The upper Rio Negro watershed (3454 km) is located between the Santa Catarina Northern Plateau and the First Plateau of Paraná. The study of mass and energy fluxes between the surface and the atmosphere allows the analysis of the influence of land-uses on the climate of the region. Hence, the objective of the present study was to map net radiation using the Surface Energy Balance Algorithm for Land (SEBAL), in the upper Rio Negro watershed, using Advanced Spaceborne Thermal and Emission Radiometer (ASTER) images. These images have refined spatial resolution in the visible, near-infrared and thermalinfrared regions (15 m, 30 and 90 m, respectively). The SEBAL was applied with climatic data from a ground station and five ASTER images, two dated April 13th and three dated April 22th, 2006. For the net radiation analysis, land use type polygons (representative samples) were selected. The water had the highest mean Rn value (610 Wm). Dense vegetation areas resulted in high Rn values (532 Wm for reforestation and 526 Wm for native forest), dark bare soil (498 Wm). Agriculture and pasture had intermediate Rn values of 444 Wm and 451 Wm. The lowest mean values were observed for light bare soil and urban areas (404 and 429 Wm, respectively), corresponding to areas with the higher energy losses by reflection and emission. Key-words: net radiation, SEBAL, ASTER, land use, upper Rio Negro watershed.

Mapeamento do Saldo de Radiação da Bacia do Alto Rio Negro, Região Sul Brasileira