This study aimed to quantify the changes in the hydrological cycle of the Amazon due the deforestation, mainly in area called "Arc of Deforestation". Thus, experiments were performed using the BRAMS (Brazilian Regional Atmospheric Modeling System) model include the submodel of dynamic vegetation GEMTM (General Energy and Mass Transport Model). We investigated the impacts caused by the actual Arc of Deforestation compared to intact forest, as well as future changes, caused by the increase of deforestation up to 2050. As surface boundary conditions we used scenarios from empirical models of deforestation for 2002 and 2050. The increase in the Arc of Deforestation showed a complex interaction on variable analysed. For example, the precipitation showed heterogeneous distribution with positive and negative anomalies that were consistent with the anomalies of other variables, such as evapotranspiration and divergence of moisture. Also, we found the influence of the great rivers and topography on precipitation distribution. The balance of radiation and energy has been affected by deforestation, mainly over area which the forest was substituted by pastures due the surface albedo had been changed. The impact of current deforestation to intact forest showed changed only over areas most affected by deforestation, while to deforestation in the future (2050) the hydrological cycle change reaches whole the Amazon region.
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