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Regional Climate Change Over Eastern Amazonia Caused by Pasture and Soybean Cropland Expansion

Gilvan Sampaio, CPTEC/INPE, sampaio@cptec.inpe.br (Presenting)
Carlos Afonso Nobre, CPTEC/INPE, carlos.nobre@inpe.br
Marcos Heil Costa, Federal University of Višosa (UFV), mhcosta@ufv.br
Prakki Satyamurty, CPTEC/INPE, saty@cptec.inpe.br
Britaldo Silveira Soares-Filho, Federal University of Minas Gerais (UFMG), britaldo@csr.ufmg.br
Manoel Ferreira Cardoso, CPTEC/INPE, mcardoso@cptec.inpe.br

In the last two decades, field observations and numerical studies revealed that large scale deforestation in Amazonia could alter the regional climate significantly, projecting a warmer and somewhat drier post-deforestation climate. This paper evaluates the impacts of the gradual conversion of Amazonia rainforest to pasture or soybean cropland. We used CPTEC-INPE AGCM to assess the effects of Amazonian deforestation on the regional climate, using projected scenarios of land cover change, where the rainforest was gradually replaced by degraded pasture or by soybean cropland following realistic patterns of land use change. The results for eastern Amazonia, where changes in land cover are expected to be stronger, show increase in surface temperature, decrease in evapotranspiration and precipitation. The reduction in precipitation in this area is more evident when the deforested area is larger than 40%, and the relationship between precipitation and deforested area shows an approximated parabolic shape for both case (pasture and soybean). This reduction occurs mainly during the dry season.

Science Theme:  LC (Land Use and Land Cover Change)

Session:  1C: Regional Hydrometeorology

Presentation Type:  Oral (view presentation (1968 KB))

Abstract ID: 47

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