Guzinski et al. (2026) Towards a global actual evapotranspiration product for the Copernicus Land Monitoring Service

Identification

• Journal: Hydrology and earth system sciences
• Year: 2026
• Date: 2026-09-08
• Authors: Radoslaw Guzinski, Héctor Nieto, José Miguel Barrios, Walid Ghariani, Françoise Gellens-Meulenberghs, Jan De Pue, Roselyne Lacaze
• DOI: 10.5194/hess-30-5593-2026

Research Groups

• DHI A/S, Agern Alle 5, 2970 Hørsholm, Denmark (Radoslaw Guzinski)
• Instituto de Ciencias Agrarias (ICA-CSIC), C/ Serrano 115b, 28006 Madrid, Spain (Héctor Nieto)
• Department of Meteorological and Climatological Research, Royal Meteorological Institute, Ringlaan 3, 1180 Brussels, Belgium (José Miguel Barrios, Walid Ghariani, Francoise Gellens-Meulenberghs, Jan De Pue)
• HYGEOS, Euratechnologies, 165 avenue de Bretagne 59000 Lille, France (Roselyne Lacaze)

Short Summary

This paper describes the development and evaluation of a global actual evapotranspiration product for the Copernicus Land Monitoring Service. The product is based on two ET models: TSEB-PT and ETLook, which are driven by input data from Sentinel-3 satellites and other Copernicus products.

Objective

• To develop a global, operational actual evapotranspiration product for the Copernicus Land Monitoring Service.
• To evaluate the performance of the TSEB-PT and ETLook models in estimating actual evapotranspiration.

Study Configuration

• Spatial Scale: Global, with a spatial resolution of 300 m.
• Temporal Scale: Dekadal (10 d mean) for water fluxes and daily for instantaneous energy fluxes.

Methodology and Data

• Models used: TSEB-PT and ETLook models.
• Data sources: Sentinel-3 satellite data, Copernicus Digital Elevation Model, and other Copernicus products.

Main Results

• The ensemble of the two models resulted in a root mean squared error (RMSE) of 0.87 mm d-1 and a bias of 0.01 mm d-1.
• The correlation coefficient between the modelled and measured evapotranspiration was 0.81.
• The results were compared with other global ETa datasets, including WaPOR.

Contributions

• This study contributes to the development of a global, operational actual evapotranspiration product for the Copernicus Land Monitoring Service.
• The study evaluates the performance of two ET models and provides insights into their strengths and limitations.

Funding

• European Commission (JRC/2023/OP/0273)
• Copernicus program

Citation

@article{Guzinski2026Towards,
  author = {Guzinski, Radoslaw and Nieto, Héctor and Barrios, José Miguel and Ghariani, Walid and Gellens-Meulenberghs, Françoise and Pue, Jan De and Lacaze, Roselyne},
  title = {Towards a global actual evapotranspiration product for the Copernicus Land Monitoring Service},
  journal = {Hydrology and earth system sciences},
  year = {2026},
  doi = {10.5194/hess-30-5593-2026},
  url = {https://doi.org/10.5194/hess-30-5593-2026}
}