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A precipitacao e considerada a principal variavel meteorologica nos tropicos. Tal importância esta associada aos impactos sociais e economicos que sao gerados em extremos de ocorrencia dessa variavel. Diversos estudos para caracterizar a estacao chuvosa na Amazonica foram realizados, entretanto poucos consideraram os componentes de perdas hidricas, como a evapotranspiracao e a respectiva disponibilidade hidrica. O presente trabalho tem como principal objetivo, avaliar a metodologia proposta por Kassam (1979), para a determinacao do inicio e fim da estacao chuvosa, utilizando dados de 13 anos (2000 a 2012) de sensoriamento remoto de precipitacao e evapotranspiracao na Amazonia. Os resultados foram bastante consistentes com as analises existentes na literatura, sobre a dinâmica sazonal amazonica. Foi observado que o periodo chuvoso pode variar entre 4 a 7 meses entre as regioes sul e norte da Amazonia, respectivamente. No extremo oeste e notada uma estacao chuvosa continua. A B S T R A C T The precipitation is considered the main meteorological variable in the tropics. This importance is associated with social and economic impacts that are generated due occurrence of extremes. Several studies to characterize the rainy season in the Amazon have been applied, but few considered the components of water loss, such as evapotranspiration and their water availability. This study aims to evaluate the methodology proposed by Kassam (1979), for determining the begining and end of the rainy season, using data from 13 years (2000-2012) of remote sensing precipitation and evapotranspiration in the Amazon. The results were quite consistent with previous analyzes in the literature on the Amazon seasonal dynamics. It was observed that the rainy season can vary among 4-7 months between the southern and northern regions of the Amazon, respectively. In the far west portion is observed an permanent rainy season. Keywords: evapotranspiration, precipitation, seasonal rainfall .

Sensoriamento Remoto como Ferramenta para a Determinação da Estação Chuvosa na Amazônia (Remote Sensing as a Tool for Determining the Rainy Season in the Amazon)