Patterns and Controls of the Latent and Sensible Heat Fluxes in the Brazilian Pampa Biome

Energy and water exchange between the surface atmosphere are important drivers to Earth’s climate from local global scale. In this study, energy dynamic biophysical mechanisms that control partitioning over a natural grassland pasture Brazilian Pampa biome investigated using two micrometeorological sites located 300 km apart, in Southern Brazil. The latent heat flux, LE, was main component of balance both autumn-winter (AW) spring-summer (SS) periods. Annually, approximately 60% available is used for evapotranspiration (ET). However, Bowen ratio presents seasonal variability greater AW than SS. Global radiation, Rg, atmospheric variable controlling LE sensible H. Hysteresis curves daily cycle were observed ET conductance, Cs, regarding environmental variables, net vapor pressure deficit, air temperature. Among variables analyzed biome, conductance respond more strongly deficit. hysteresis cycles formed by show substantial process. results obtained here allowed comprehension involved partition process grassland. Therefore, study can be as base research on land-use changes unique ecosystem biome.