Estimating instantaneous evapotranspiration based on dual-angle thermal infrared observations from Sentinel-3 satellite

被引：0
|
作者：
Xue K. [1 ]
He M. [1 ]
Bian Z. [2 ]
Song L. [1 ]
Xu Y. [1 ]
Jiang H. [1 ]
机构：
[1] School of Geography Science, Southwest University, Chongqing
[2] State Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute of Chinese Academy of Sciences, Beijing
来源：
Song, Lisheng (songls@swu.edu.cn) | 1683年 / 25期
基金：
中国国家自然科学基金;
关键词：
Component temperature (TSEB-2T); Land surface temperature (TSEB-PT); Surface flux; Validation;
D O I：
10.11834/jrs.20211237
中图分类号：
学科分类号：
摘要：
The Two-Source Energy Balance (TSEB) model is often used in the estimation of surface evapotranspiration which is important for the water resources regulation and utilization especially in arid and semi-arid areas. Using the different model inputs, such as land surface temperature and surface component temperatures (soil and vegetation) which are the key boundary of the TSEB model can vary the model performance in the prediction of evapotranspiration. In this paper, the Land Surface Temperature (LST) at nadir angle and Land Surface Component Temperatures (LSCT) retrieved from dual-angle observations of Sentinel-3 were used to drive the TSEB model in Heihe River Basin. At each site, the ground measurements data including net radiation, soil heat flux, sensible and latent heat fluxes were measured by radiometer, heat-plates, eddy covariance, respectively, and with the representativeness ranges from meters to hundreds of meters. The energy balance closure was enforced in the EC system observations using the Bowen ratio approach. What's more, the large aperture scintillometers were used to measure the sensible heat flux over several kilometers areas to partly solve the mismatch between the model's output and ground measurement.Then, the outputs including net radiation, soil heat flux, sensible and latent heat fluxes are evaluated using the ground measurements from EC and LAS which have larger source areas over the grassland, cropland and riparian forest landcover types in the Heihe River Basin, respectively. The results showed that both models overestimate the net radiation and latent heat flux with values of mean bias range from 50 to 150 W/m2 and from 60 to 130 W/m2 when compared with the ground measurements. However, the model performances of the TSEB-PT and TSEB-2T varied over different landcover types. In order to further explore the overestimation in latent heat flux from the two models, we intercompared the spatial pattern of plant transpiration estimated by the two models along with the moderate-resolution imaging spectroradiometer (MODIS) leaf area index data and the canopy temperature separated by the two models. It informed that the difference of model separated component temperatures mainly lead to the difference outputs of latent heat fluxes between TSEB-PT model and TSEB-2T model. Additionally, the TSEB-PT model mainly overestimated the canopy transpiration especially over the areas with high vegetation fraction coverage in the upstream of Heihe River Basin. This may due to the canopy temperature separated by the TSEB-PT model have lower values when compared with the inputs of canopy temperature in the TSEB-2T model. The lower canopy temperature could lead to lower sensible heat flux values and result in higher latent heat flux which is calculated as a residual in the land surface energy balance equation.The results showed that the TSEB-PT model has a better performance in the areas with low vegetation fraction coverage such as alpine meadows and riparian forest land cover types. However, the TSEB-2T model performed better in the areas with high vegetation fraction coverage, such as farmland, forest and so on. What's more, as the fraction of vegetation coverage increase, the advantages of the TSEB-2T model are more obvious. The research results can provide water resources managers with more accurate estimates of land surface water consume over difference ecosystem. © 2021, Science Press. All right reserved.
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页码：1683 / 1699
页数：16
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