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As cheias e vazantes do rio Amazonas passaram a ser mais persistentes ao longo dos anos. Este estudo busca analisara influencia da variabilidade temporal em escala de bacia hidrografica sobre o regime do rio Amazonas, a partir das vazoes da estacao hidrologica da Agencia Nacional de Aguas – ANA, localizada em Obidos, no Estado do Para em uma serie historica de janeiro/1970 a dezembro/2013. Alem do tempo, o estudo analisou a intensidade do El Nino e La Nina. Como esperado, o tempo influenciou na vazao media interanual encontrada de 98.723 m 3 /s para os 44 anos da serie analisada. Porem com variabilidade anual do regime do rio Amazonas de intensas proporcoes temporais, com a vazao variando de ordem de 72.380 m 3 /s (como em 1997) no regime de vazante ate uma ordem de 131.620 m 3 /s (como em 1974) no regime de cheia. Tambem foi identificado que fenomenos de El Nino e La Nina modularam eventos climaticos extremos sobre as vazoes da Bacia Amazonica em cada ano. A analise interanual mostrou que os anos de baixas vazoes, possuiam a caracteristica de persistencia de ocorrencia em relacao as altas vazoes. A partir de 1989, houve um aumento em relacao a amplitude media da vazao de 87.727 m 3 /s devido a fortes niveis minimos registrados. Ao analisar a vazao normalizada percebeu-se que na maioria dos anos de baixa vazao foram tambem anos do fenomeno El Nino. Constatado esta persistencia de baixas vazoes, investigaram-se os fatores de armazenamento e disponibilidade do rio Amazonas. Analysis of Hydrological Regime Componentof the Amazonas River Basin in Years of Climate Events. ABSTRACT The floods and drains of the Amazon River have become more persistent over the years. This study seeks to analyze the influence of the temporal variability in the basin scale on the Amazon river regime, from the flows of the hydrological station of the National Water Agency - ANA, located in Obidos, State of Para, in a historical series from January/1970 to December /2013. Besides time, the study analyzed the intensity of El Nino and La Nina. As expected, time influenced the annual interannual flow rate of 98,723 m 3 /s for the 44 years of the analyzed series. However, with an annual variability of the Amazon river regime of intense flows, with an increase of 72,380 m 3 /s (as in 1997) in the effluent regime up to an order of 131,620 m 3 /s (as in 1974) in the flood regime. It was also identified that El Nino and La Nina phenomena modulated extreme climatic events on the Amazon Basin flows each year. The year-on-year analysis showed that the years of low flows had a persistence of occurrence in relation to high flows. As of 1989, there was an increase in relation to the average flow amplitude of 87,727 m 3 /s due to the strong minimum levels recorded. Analyzing the normalized flow rate, it was observed that in most of the years of low flow there were also years of the El Nino phenomenon. Considering this persistence of low flows, we investigated the storage and availability factors of the Amazon River. Keywords: Time flows. Ecological Maintenance.Amazonriver.

Análise de Componente do Regime Hidrológico da Bacia do Rio Amazonas em Anos de Eventos Climáticos