Um modelo sintético de larga escala aplicado à hidroclimatologia e à ecogeodinâmica da Bacia do Rio Amazonas

Resumo

The target of this project is to establish a large-scale synthetic model applied to large river basins and based on the abundant data accumulated during the last 40 years. It constitutes an ambitious program which brings together, perhaps for the first time, several areas of knowledge (soil sciences, hydrology, isotopic geochemistry, climatology, hydrobiology) and should open interesting perspectives in term of river basin management. This research will be particularly focused on the different compartments delineated in the Soil-River-Atmosphere-Biosphere Amazonian global system. The methodology fundamentally relies upon end-member mixing models which allow reconstituting the internal metabolism of soils and their dynamics. The applications are of major importance to monitor the rapid continental scale environmental changes connected to land-use changes and deforestation in the. Amazon river basin. The intensive monitoring of the Ji-Parana and Piracicaba river basins provide an ideal support for the investigation. The modelling will also be oriented to the construction of a tool, capable to elaborate prediction scenario of the Amazonian physiological behaviour in reaction to climate change (effect or factor) or climatic crises. The contribution and impacts of the Amazon river system to the world-wide CO2 budget, will be objectively re-evaluated, in the light of the documented and synthetic large-scale modelling. One of the most appealing issue concerns the driving control of evaporative fluxes on soil respiration. (AU)