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Monitoring evapotranspiration at landscape scale in Mexico: applying the energy balance model using remotely-sensed data

机译：监测墨西哥景观尺度上的蒸散量：使用遥感数据应用能量平衡模型

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摘要

Thermal and spectral remotely sensed data make the monitoring from flux energy variables in the land atmosphere interface possible. Therefore, remotely sensed data can be used as an alternative to estimate actual evapotranspiration (ET) by applying the energy balance equation. In order to test the applicability of this approach in Mexico, MODIS (Moderate Resolution Imaging Spectroradiometer) estimations from land surface variables are used at 16-day intervals of composite data. Ancillary information is collected from 2000 ground stations. The methodology includes the Simplified Surface Energy Balance model (SSEB) and its intercomparison with a combined model from the Surface Energy Balance Algorithm (SEBAL) and the Two Source Energy Balance (TSEB) procedures. Preliminary results applied to one 16-day interval during winter, 2002, showed that ET is spatially structured at a landscape level. The most significant discrepancies between estimations are found due to the general assumptions applied to each model. Secondly, the use of interpolated ancilliary data from local observations, along with remote sensing data, provides a better representation of spatial variations of ET with SEBAL-TSEB model for the study period. There is not enough evidence to asses objectively the performance of both applied procedures. Further testing is required to evaluate at a local scale the reliability from estimations.
机译：借助热能和光谱遥感数据，可以从陆地大气界面中的通量能量变量进行监视。因此，通过应用能量平衡方程，可以将遥感数据用作估计实际蒸散量（ET）的替代方法。为了测试这种方法在墨西哥的适用性，以地面数据为基础的MODIS（中等分辨率成像光谱仪）估计值每16天合成一次数据。辅助信息是从2000个地面站收集的。该方法包括简化的表面能平衡模型（SSEB）及其与来自表面能平衡算法（SEBAL）和两源能量平衡（TSEB）程序的组合模型的比较。对2002年冬季进行的每16天间隔的初步结果表明，ET在景观级别上具有空间结构。由于适用于每个模型的一般假设，因此发现估计之间的最显着差异。其次，使用SEBAL-TSEB模型在研究期内从本地观测数据中插值辅助数据以及遥感数据，可以更好地表示ET的空间变化。没有足够的证据来客观地评估两个应用程序的性能。需要进行进一步测试，以在本地范围内评估估计的可靠性。

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