HR: 0800h
AN: A51C-04    [Abstracts]
TI: Influence Deforestation on Hydrological Cycle at Amazon Basin
AU: * Cohen, J C
EM: jcpcohen@ufpa.br
AF: Department of Meteorology Federal University of Para , Rua Augusto Correa, 1 - Guama, Belem, PA 66075-110, Brazil
AU: Beltrao, J
EM: josivan@ufpa.br
AF: Department of Meteorology Federal University of Para , Rua Augusto Correa, 1 - Guama, Belem, PA 66075-110, Brazil
AU: Gandu, A W
EM: adwgandu@model.iag.usp.br
AF: Department of Atmospheric Sciences Institute of Astronomy, Geophysics and Atmospheric Sciences University of Sao Paulo , Rua do Matao, 1226, Sao Paulo, SP 05508-090, Brazil
AB: The last three decades, the Amazon Basin has been affected for the occupation with consequence large deforestation. The principal area deforested is located from Maranhao state to Rondonia state. This area is common called "Arc Deforestation", and representing the transition between two important Brazilian ecosystems, Amazon Forest and Savanna Region. Theses ecosystems have precious biodiversity, and it has population about 10.331.000. The objective of this work was to evaluate the impact of arc deforestation on the hydrological cycle at Amazon basin, using BRAMS (Brazilian developments on the Regional Atmospheric Modeling System) including a model of dynamic vegetation, called GEMTM (General Energy and Mass Transport Model). In this study, numerical simulations were performed with a high spatial resolution regional model that allows capture some mesoscale aspects associated to the land used, topography, coastlines and large rivers. In order to predict the impact of the arc deforestation over the hydrological cycle, it was run two model simulations, conducted over a one-year period. In the first simulation, designated "control", it was used the scenarios derived from Soares Filho (2002), for the year 2002, in governance situation. In the second simulation called "deforestation", it was used the scenarios for the 2050, derived from results of Soares-Filho with governance, too. The higher-resolution regional modeling revealed important features of the deforestation process, displaying some associated mesoscale effects that are not typically represented in similar Global Circulation Model simulations. Near coastal zones and along large rivers, deforestation resulted in reduced precipitation. However, it was predicted increased precipitation over mountainous areas, especially on mountain slopes facing river valleys. Then, these higher-resolution simulations showed that, in general, orography, coastline profile and large river distribution play important roles in determining anomaly patterns of precipitation in Amazon Basin. It had seen an increase in the rain in the deforested regions, and it did not have substantial effect in the undisturbed regions. It was still observed, increase of temperature in the deforested region.
DE: 3322 Land/atmosphere interactions (1218, 1631, 1843)
SC: Atmospheric Sciences [A]
MN: 2007 Joint Assembly