Assessment of an extended SPARSE model for estimating evapotranspiration from directional thermal infrared data

Mwangi, Samuel; Boulet, G.; Olioso, Albert

doi:10.1016/j.agrformet.2022.108882

Cited by 8 publications

(3 citation statements)

References 51 publications

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“…The magnitude of ET bias across different VZAs is close. We infer this is partly because the angular variation of thermal radiation is not pronounced when VZA is below 30° (Ermida et al 2018;Hu et al 2019;Mwangi et al 2022). Moreover, the high spatial homogeneity at the EC sites (Fisher et al 2020) is also an important factor for the weak angular variation of thermal radiation.…”

Section: Comparison Between Stic and Pt-jplmentioning

confidence: 76%

Evaluating European ECOSTRESS Hub Evapotranspiration Products Retrieved from Three Structurally Contrasting SEB Models over Europe

Mallick²,

Hitzelberger

et al. 2022

Preprint

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The ECOsystem Spaceborne Thermal Radiometer Experiment on Space Station (ECOSTRESS) is a scientific mission that collects high spatio-temporal resolution (~70 m, 1-5 days average revisit time) thermal images since its launch on 29 June 2018. As a predecessor of future missions, one of the main objectives of ECOSTRESS is to retrieve and understand the spatio-temporal variations in terrestrial evapotranspiration (ET) and its responses to soil water availability. In the European ECOSTRESS Hub (EEH), by taking advantage of land surface temperature retrievals, we generated ECOSTRESS ET products over Europe and Africa using three structurally contrasting models, namely Surface Energy Balance System (SEBS) and Two Source Energy Balance (TSEB) parametric models, as well as the non-parametric Surface Temperature Initiated Closure (STIC) model. A comprehensive evaluation of the EEH ET products was conducted with respect to flux measurements from 19 eddy covariance sites over 6 different biomes with diverse aridity levels.Results revealed comparable performances of STIC and SEBS (RMSE of ~70 W m -2 ). However, the relatively complex TSEB model produced a higher RMSE of ~90 W m -2 . Comparison between STIC ET estimate and the operational ECOSTRESS ET product from NASA PT-JPL model showed a difference in RMSE between the two ET products around 50 W m -2 . Substantial overestimation (>80 W m -2 ) was noted in PT-JPL ET estimates over shrublands and savannas presumably due to the weak constraint of LST in the model. Overall, the EEH is promising to serve as a support to the Land Surface Temperature Monitoring (LSTM) mission.

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Section: Comparison Between Stic and Pt-jplmentioning

confidence: 76%

Evaluating European ECOSTRESS Hub Evapotranspiration Products Retrieved from Three Structurally Contrasting SEB Models over Europe

Mallick²,

Hitzelberger

et al. 2022

Preprint

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show abstract

“…The average ET biases for STIC and SEBS are close to 5 and 15 W m −2 , respectively across different bins of VZA, which is higher for TSEB (∼50 W m −2 ). We infer this is partly because the angular variation of thermal radiation is not pronounced when VZA is below 30° (Ermida et al, 2018;Hu et al, 2019;Mwangi et al, 2022). Moreover, the high spatial homogeneity at the EC sites (Fisher et al, 2020) is also an important factor for the weak angular variation of thermal radiation.…”

Section: Factors Affecting Model Performancesmentioning

confidence: 87%

Evaluating European ECOSTRESS Hub Evapotranspiration Products Across a Range of Soil‐Atmospheric Aridity and Biomes Over Europe

Hu,

Mallick,

Hitzelberger

et al. 2023

Water Resources Research

Self Cite

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The ECOsystem Spaceborne Thermal Radiometer Experiment on Space Station (ECOSTRESS) is a scientific mission that collects high spatio‐temporal resolution (∼70 m, 1–5 days average revisit time) thermal images since its launch on 29 June 2018. As a predecessor of future missions, one of the main objectives of ECOSTRESS is to retrieve and understand the spatio‐temporal variations in terrestrial evapotranspiration (ET) and its responses to soil water availability and atmospheric aridity. In the European ECOSTRESS Hub (EEH), by taking advantage of land surface temperature (LST) retrievals, we generated ECOSTRESS ET products over Europe and Africa using three models with different structures and parameterization schemes, namely Surface Energy Balance System (SEBS) and Two Source Energy Balance (TSEB) parametric models, as well as the non‐parametric Surface Temperature Initiated Closure (STIC) model. A comprehensive evaluation of the EEH ET products was conducted with respect to flux measurements from 19 eddy covariance sites in Europe over six different biomes with diverse aridity levels. Results revealed comparable performances of STIC and SEBS (RMSE of ∼70 W m−2). However, the relatively complex TSEB model produced a higher RMSE of ∼90 W m−2. Comparison between STIC ET estimates and the operational ECOSTRESS ET product from NASA PT‐JPL model showed a larger RMSE (around 50 W m−2 higher) for the PT‐JPL ET estimates. Substantial overestimation (>80 W m−2) in PT‐JPL ET estimates was evident over shrublands and savannas, presumably due to weak constraint of LST in the model. Overall, the EEH supports ET retrieval for the future high‐resolution thermal missions.

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“…They could therefore jeopardize the detection and monitoring of water stress as well as other downstream products (Mwangi et al, 2022). A normalization effort seems mandatory in order to reach the target accuracy of 1K for LST.…”

Section: Introductionmentioning

confidence: 99%

Quantifying Thermal Infra-Red directional anisotropy using Master and Landsat-8 simultaneous acquisitions

Michel,

Hagolle,

Hook

et al. 2023

Remote Sensing of Environment

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Assessment of an extended SPARSE model for estimating evapotranspiration from directional thermal infrared data

Cited by 8 publications

References 51 publications

Evaluating European ECOSTRESS Hub Evapotranspiration Products Retrieved from Three Structurally Contrasting SEB Models over Europe

Evaluating European ECOSTRESS Hub Evapotranspiration Products Retrieved from Three Structurally Contrasting SEB Models over Europe

Evaluating European ECOSTRESS Hub Evapotranspiration Products Across a Range of Soil‐Atmospheric Aridity and Biomes Over Europe

Quantifying Thermal Infra-Red directional anisotropy using Master and Landsat-8 simultaneous acquisitions

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