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Comparison of three remote sensing based models to estimate evapotranspiration in an oasis-desert region

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  • Lian, Jinjiao
  • Huang, Mingbin

Abstract

Regional evapotranspiration (ET) estimation is crucial for regional water resources management and allocation. This paper evaluated the performance of three contextual remote sensing based models for ET estimation (METRIC—Mapping Evapotranspiration at High Resolution with Internalized Calibration; the Ts-VI triangle model; and SSEB-Simplified Surface Energy Balance) in an oasis-desert region during a growing season under advective environmental conditions. The performance of the three models was first assessed using surface fluxes observed at five eddy covariance (EC) flux towers installed in different land-cover types. Comparisons among model outputs were then conducted on a pixel-by-pixel basis for three main land-cover types (farmland, transition zone and desert). For METRIC and SSEB, good correlations were obtained between the modeled versus measured instantaneous latent heat flux (λET), with both R2 values above 0.90. Outliers occurred when available energy was overestimated for the Ts-VI triangle model. Pixel-wise comparisons showed the greatest consistency between the Ts-VI triangle model and METRIC outputs in farmland with an R2 of 0.98 and an RMSE of 13.69Wm−2. Overall, METRIC outperformed both the Ts-VI triangle and SSEB models; the Ts-VI triangle model tended to overestimate and the SSEB to underestimate at higher values of λET. ET estimations by SSEB and the Ts-VI triangle model are more sensitive to the estimated surface temperature and available energy than those from METRIC. Two daily ET extrapolation methods were evaluated with the EC measured daily ET . The results indicated that the constant reference ET fraction (ETrF) method could be used over well-watered areas due to the regional advection effect; the constant evaporative fraction (EF) method tended to give better outputs for other areas. Reasonable estimates of ET can be achieved by carefully selecting extreme pixels or edges, and validation is required when applying remote sensing based models, especially the contextual methods.

Suggested Citation

  • Lian, Jinjiao & Huang, Mingbin, 2016. "Comparison of three remote sensing based models to estimate evapotranspiration in an oasis-desert region," Agricultural Water Management, Elsevier, vol. 165(C), pages 153-162.
    • Handle: RePEc:eee:agiwat:v:165:y:2016:i:c:p:153-162
    DOI: 10.1016/j.agwat.2015.12.001
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    1. Zhao, Wenzhi & Liu, Bing & Zhang, Zhihui, 2010. "Water requirements of maize in the middle Heihe River basin, China," Agricultural Water Management, Elsevier, vol. 97(2), pages 215-223, February.
    2. Senay, G.B. & Budde, M.E. & Verdin, J.P., 2011. "Enhancing the Simplified Surface Energy Balance (SSEB) approach for estimating landscape ET: Validation with the METRIC model," Agricultural Water Management, Elsevier, vol. 98(4), pages 606-618, February.
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    2. Feng, Yu & Cui, Ningbo & Du, Taisheng & Gong, Daozhi & Hu, Xiaotao & Zhao, Lu, 2017. "Response of sap flux and evapotranspiration to deficit irrigation of greenhouse pear-jujube trees in semi-arid northwest China," Agricultural Water Management, Elsevier, vol. 194(C), pages 1-12.
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    4. Xue, Jingyuan & Bali, Khaled M. & Light, Sarah & Hessels, Tim & Kisekka, Isaya, 2020. "Evaluation of remote sensing-based evapotranspiration models against surface renewal in almonds, tomatoes and maize," Agricultural Water Management, Elsevier, vol. 238(C).

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