Actual evapotranspiration estimation over flat lands using soil moisture products from SMAP mission

Revista oficial de la Asociación Española de Teledetección[EN] Evapotranspiration (ET) is an important process in the water cycle and in the land-surface energy balance. Over the last decades, remote sensing has provided valuable information to quantify ET. However, methodologies that use data from microwave passive sensors, such as “Soil Moisture Active Passive” (SMAP) mission, have been recently developed. In this work, a formulation to derive the relative evapotranspiration and ET from in situ and microwave data, is presented. The methodology is based on a modification of the original Komatsu (2003) equation by introducing a calibration parameter to represent the wind speed and vegetation effects and estimate the relative evapotranspiration. This new equation was used on the Bouchet’s complementary relationship with the Priestley-Taylor’s equation, to estimate ET at regional scales. The results were compared with observed data in the Southern Great Plains – USA (SGP) area, indicating that the new model estimated ET with a root mean square error (RMSE) of 0.88 mmd–1 and a coefficient of determination (R2 ) greater than 0.8. The calibrated model was applied in an extremely humid period in Argentinean Pampas region with results near to potential rates.[ES] La evapotranspiración (ET) es un proceso importante en el ciclo hidrológico y en el balance energético de la superficie terrestre. En las últimas décadas, la teledetección ha aportado información muy valiosa a la hora de cuantificar la ET. Sin embargo, recién en los últimos años se han desarrollado metodologías que utilizan datos de sensores pasivos de microondas, como los de la misión “Soil Moisture Active Passive” (SMAP). En este trabajo, se presenta una formulación para determinar la evapotranspiración relativa y ET con datos in situ y de microondas. La metodología se basa en una modificación de la ecuación original de Komatsu (2003) en la que se introdujo un parámetro de calibración que representa el efecto de la velocidad del viento y la vegetación y permite estimar la evapotranspiración relativa. Esta nueva ecuación es utilizada en la relación complementaria de Bouchet junto a la ecuación de Priestley y Taylor, para estimar la ET a escala regional. Los resultados obtenidos fueron comparados con datos observados en el área de Southern Great Plains - USA (SGP), indicando que el nuevo modelo estima la ET con un error medio cuadrático (RMSE) de 0,88 mm d–1 y un coeficiente de determinación (R2) superior a 0,8. El modelo calibrado fue aplicado en un período extremadamente húmedo en la Región Pampeana de Argentina arrojando resultados que se aproximaron a tasas potenciales.Walker, E.; García, GA.; Venturini, V. (2018). 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