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O RAMS (Sistema de Modelagem Atmosferica Regional) na versao 8.0 e utilizado neste estudo com o objetivo de avaliar como a expansao da agricultura irrigada pode modificar processos de interacao entre a superficie e a atmosfera. Dois cenarios (com e sem influencia antropica) sao utilizados para simular mudancas na configuracao espacial dos fluxos turbulentos em condicoes atmosfericas moduladas pela atuacao de um VCAN (vortice ciclonico de altos niveis). Os resultados indicam que a variabilidade espacial dos fluxos turbulentos e altamente influenciada pelas caracteristicas da superficie, topografia, umidade no solo e tipo de vegetacao. Por outro lado, a reducao no teor de umidade da atmosfera, normalmente referenciado como deficit de pressao de vapor (DPV), e outro fator que exerce um forte controle sobre a taxa de evapotranspiracao e pode alterar consideravelmente o balanco de energia em superficie. Nos periodos de atividade convectiva intensa a influencia da irrigacao nos fluxos turbulentos nao e evidente. Em contrapartida, os fluxos simulados nos dias sem precipitacao sao bastante afetados pela disponibilidade de agua no solo nos perimetros irrigados. Esse efeito e mais pronunciado do que o da mudanca das areas de vegetacao nativa por areas agricolas. Normal 0 21 false false false EN-US X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabela normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin-top:0cm; mso-para-margin-right:0cm; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0cm; line-height:115%; mso-pagination:widow-orphan; font-size:12.0pt; font-family:"Times New Roman","serif"; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi; color:black; mso-themecolor:text1; mso-ansi-language:EN-US; mso-fareast-language:EN-US;} A B S T R A C T The RAMS (Regional Atmospheric Modeling System) version 8.0 is used in this study aiming to evaluate how the expansion of the irrigated agriculture can modify the processes of interaction between the surface and the atmosphere. Two scenarios (with and without anthropogenic influence) are used to simulate changes in the spatial pattern of the turbulent fluxes in atmospheric conditions modulated by an ULCV (upper level cyclonic vortex). The results indicate that the spatial variability of the turbulent fluxes is highly influenced by surface characteristics, topography, soil moisture and vegetation type. On the other hand, a reduction in the moisture content of the atmosphere, normally referenced as the vapor pressure deficit (VPD), is another factor that exerts a strong control upon the evapotranspiration rate and may considerably alter the surface energy balance. In periods of intense convective activity the influence of irrigation upon the turbulent fluxes is not evident. By contrast, the fluxes simulated in rainless days are highly affected by the availability of water in the soil of the irrigated perimeters. This effect is more pronounced than the one due to the change of the native vegetation areas by agricultural areas

EXPANSÃO DA AGRICULTURA IRRIGADA E MUDANÇAS NOS PROCESSOS DE INTERAÇÃO SUPERFÍCIE-ATMOSFERA: UM ESTUDO NUMÉRICO DE IMPACTO AMBIENTAL EM ÁREAS DE CAATINGA (EXPANSION OF IRRIGATED AGRICULTURE AND CHANGES IN PROCESSES OF SURFACE-ATMOSPHERE INTERACTION: A NUM