Assessing MODIS16A2 actual evapotranspiration across three spatial resolutions in Uruguay

R. Navas, G. Tiscornia, A. Berger, Á. Otero
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引用次数: 1

Abstract

Evapotranspiration (ET) is a key process in hydrological systems and, consequently, in agroecosystems. It can be measured or derived with a large variety of models at scales ranging from leaf to catchment. MODIS16A2 is a satellite ET product with 500 meters / 8-day spatio-temporal resolution worldwide. It is based on the Penman-Monteith equation and considers the effect of vegetation dynamics, albedo and land cover. This technical paper compares the ET estimated from MODIS16A2 against the ET estimated at different scales from three reference methods: (1) the INIA-GRAS Water Balance on a country-scale, (2) the SWAT model of the Santa Lucia basin on the catchment scale, and (3) the Eddy Covariance Flux located in Colonia on a farmer scale. The analysis shows similarities between MODIS16A2 and the reference methods depending on seasonality, geographic location and scale of ET estimation. The assumptions about vegetation cover, vegetation dynamics, meteorological forcing and soil characteristics of the reference methods compared with MODIS16A2 ones could explain some deviations in the ET estimations. The results of this work contribute with a first approximation towards the quantification of the uncertainty of MODIS16A2 in Uruguay.
评估乌拉圭三个空间分辨率的MODIS16A2实际蒸散量
蒸散发(ET)是水文系统的关键过程,因此也是农业生态系统的关键过程。它可以用从叶片到流域的各种尺度的模型来测量或推导。MODIS16A2是全球500米/ 8天时空分辨率的卫星ET产品。该模型以Penman-Monteith方程为基础,考虑了植被动态、反照率和土地覆盖的影响。本文将MODIS16A2估算的ET与三种参考方法估算的不同尺度的ET进行了比较:(1)国家尺度上的nia - gras水平衡,(2)流域尺度上的Santa Lucia流域SWAT模型,以及(3)农民尺度上的Colonia涡旋相关通量。分析表明,MODIS16A2与参考方法在季节性、地理位置和ET估算尺度等方面存在相似之处。参考方法对植被覆盖、植被动态、气象强迫和土壤特征的假设与MODIS16A2方法的比较可以解释蒸散发估算的一些偏差。这项工作的结果有助于对乌拉圭MODIS16A2不确定性的量化作出初步近似。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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