Estimativa da evapotranspiração de referência com dados climáticos limitados no estado do Piauí

Abstract

The study evaluated the performance of the Penman-Monteith model (PM-FAO) estimate the potential evapotranspiration (ETo), with estimated missing weather data. The PM-FAO method, the measured variables were compared with seven situations where there is no data to calculate ETo estimating mean velocity values of wind, partial pressure of steam , solar radiation and combining two or more of these estimated variables . The performance of the methods was analyzed using Pearson's correlation coefficient; Willmott agreement index; and confidence index or performance. The ETo with estimated data of wind speed showed better performance.