NDLI: Estimation of regional evapotranspiration in the extended Salado Basin (Argentina) from satellite gravity measurements

Content Provider	Springer Nature Link
Author	Cesanelli, Andrés Guarraci, Luis
Copyright Year	2011
Abstract	In this study, regional evapotranspiration is estimated in a wide flatland area that includes Salado River Basin and four tributary basins by using gravity measurements of the space mission Gravity Recovery and Climate Experiment (GRACE). Monthly estimates of large-scale variations in the land-water storage are obtained from the satellite data. Evapotranspiration is computed with the water-balance equation using the GRACE land-water solutions, rainfall data from the Global Precipitation Climatology Center and runoff values obtained as 5% of the precipitation. GRACE-derived evapotranspiration values are consistent with the different climatic scenarios observed, and they satisfactorily agree with estimates provided by a global hydrological model. The overall results show that the method used is a valid tool for characterizing the evapotranspiration in the Argentine Pampas and that it can be used to detect and examine changes in the evapotranspiration pattern associated with the occurrence of extreme climatic events. This study illustrates the ability of GRACE to analyze and predict evapotranspiration and other processes on a regional scale in a flatland area.Dans cette étude, l’évapotranspiration régionale est évaluée sur un large secteur topographiquement plat, qui inclut le bassin versant du Salado et quatre bassins tributaires, en utilisant les mesures de gravité de la mission spatiale Gravity Recovery and Climate Experiment (GRACE). L’estimation mensuelle des variations à grande échelle du stockage d’eau dans le sol est obtenue à partir des données satellites. L’évapotranspiration est calculée en utilisant l’équation de bilan incluse dans le modèle eau terrestre de GRACE, les hauteurs de pluies provenant du Global Precipitation Climatology Center et les valeurs de ruissellement considérées comme équivalant à 5% des précipitations. Les valeurs d’évapotranspiration tirées de GRACE sont compatibles avec les différents scénarii climatiques observés et avec les évaluations fournies par un modèle hydrologique global. L’ensemble des résultats montre que la méthode utilisée est un outil valable pour caractériser l’évapotranspiration dans la pampa argentine et qu’il peut être utilisé pour détecter et examiner les changements du modèle d’évapotranspiration associé à l’occurrence d’événements climatiques extrêmes. Cette étude illustre la capacité de GRACE à analyser et prévoir l’évapotranspiration ou d’autres processus à une échelle régionale dans un secteur topographiquement plat.En en el presente estudio, se estima la evapotranspiración regional en una extensa área de llanura que incluye a la cuenca del Río Salado y cuatro cuencas tributarias utilizando mediciones de gravedad de la misión espacial Gravity Recovery and Climate Experiment (GRACE). A partir de los datos satelitales se obtienen estimaciones mensuales de las variaciones a gran escala en el almacenamiento de agua continental. La evapotranspiración se calcula con la ecuación de balance de agua utilizando las estimaciones obtenidas con GRACE, datos de precipitación del Global Precipitation Climatology Center y valores de escurrimiento superficial obtenidos como el 5% de la precipitación. Los valores de evapotranspiración calculados utilizando GRACE son consistentes con los diferentes escenarios climáticos observados, y concuerdan satisfactoriamente con las estimaciones provistas por modelos hidrológicos globales. Los resultados generales muestran que el método utilizado es una herramienta válida para la caracterización de la evapotranspiración en la región pampeana argentina y que puede ser usado para detectar y evaluar cambios en el patrón de evapotranspiración asociados con la ocurrencia de eventos climáticos extremos. Este estudio ilustra la utilidad de GRACE para analizar y predecir la evapotranspiración y otros procesos a escala regional en un área de llanura.在本次研究中, 利用太空任务重力恢复与气候实验(GRACE)的重力资料估计包括萨拉多河流域和四个支流流域在内的宽广平原的区域蒸散发量。通过卫星数据获得对大地蓄水量大尺度变化的按月估计值。利用GRACE水土信息解译、从全球降雨气候中心得到的降雨量数据及获得的相当于降水量的5%的径流量之间的水平衡等式计算蒸散发量。利用GRACE推导得到的蒸散发值与观察到的不同气候场景的值相一致, 且与由全球水文模型提供的估计值高度一致。全部结果显示采用的方法是描述阿根廷潘帕斯平原的蒸散发量有效工具, 且可以将蒸散发量与极端气候事件的联系起来研究, 用于探测和调查蒸散发类型的变化。本研究阐明了GRACE分析和预测平原区蒸散发量及区域尺度上的其他过程的能力。No presente estudo, a evapotranspiração regional é estimada numa extensa área aplanada que inclui a Bacia do rio Salado e quatro bacias tributárias, através de medições de gravidade da missão espacial “Gravity Recovery and Climate Experiment” (GRACE). Estimações mensais de variações de grande escala do armazenamento de água na terra são obtidas a partir da informação de satélite. A evapotranspiração é calculada através da equação do balanço de água, usando soluções do GRACE para a água no terreno, informação relativa à precipitação proveniente do Centro Global de Precipitação e Climatologia, e valores de escoamento superficial que se assumem como sendo 5% da precipitação. Os valores de evapotranspiração obtidos através do GRACE concordam com os diferentes cenários climáticos observados, e estão satisfatoriamente de acordo com as estimações fornecidas por um modelo hidrológico global. De um modo geral, os resultados mostram que o método usado é um instrumento válido para caracterizar a evapotranspiração nas Pampas argentinas e que pode ser usado para determinar e examinar mudanças nos padrões de evapotranspiração associadas à ocorrência de eventos climáticos extremos. Este estudo ilustra a capacidade do GRACE para analisar e prever a evapotranspiração e outros processos a uma escala regional numa área aplanada.
Starting Page	629
Ending Page	639
Page Count	11
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	19
Issue Number	3
e-ISSN	14350157
Language	Portuguese
Publisher	Springer-Verlag
Publisher Date	2011-03-09
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Evapotranspiration Hydrogeophysics GRACE Remote sensing Argentina Geology Waste Water Technology Water Pollution Control Water Management Aquatic Pollution Hydrogeology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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