The terrestrial surface in the tropics and the atmosphere form a strongly coupled system. The surface fluxes define the burned water and energy inputs in the lower atmosphere, and depend mainly on the radiation supply, soil moisture and evapotranspiration, plant cover and cloud cover, as well as the dynamic properties of the planetary boundary layer. Deforestation and changes in soil use modify the physical-chemical interactions between soil, vegetation and the atmosphere. The use of meteorological models coupled with biophysical models is fundamental to predict future scenarios of deforestation and expansion of agricultural areas, such as those of planting, one of the crops used in the production of biofuels. In this work the numerical model of mesoscaleBRAMS was used. The soil-vegetation-atmosphere interaction module of this model (LEAF-3) was adapted to contemplate the temporal evolution of the crop from the planting to the harvest. Comparisons will be made between some predicted surface flows and those observed in the Tapajós National Forest, reported in Rocha et al (2004), as well as the expected flows on pasture and soybean.
