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Hydrological performance of gridded meteorological products in Peruvian Altiplano basins
Author(s)
Lujano, Efrain
Universidad Nacional del Altiplano
Lujano, Rene
Universidad Nacional del Altiplano
Sanchez-Delgado, Miguel
Universidad Nacional Agraria La Molina
Lujano, Apolinario
Universidad Nacional Agraria La Molina
Date Issued
1 de enero de 2025
Type
Article
Publisher
Brazilian Journal of Water Resources
Volume
30
Series/Report No.
Revista Brasileira de Recursos Hídricos
Contained in
Revista Brasileira de Recursos Hidricos
ISSN
1414-381X
2318-0331
Abstract
Gridded meteorological datasets represent a valuable alternative for hydrometeorological applications, especially in areas with limited ground observations. However, it is important to evaluate these datasets to quantify their accuracy, error, and bias in estimates. The objective of this research was to assess the hydrological performance of gridded meteorological products in Peruvian Altiplano basins. Three evaluation approaches were employed: 1) pixel-to-point, 2) basin-averaged values, and 3) as forcings in hydrological modeling. Using precipitation (P) and potential evapotranspiration (PET) data from AgERA5, ERA5-Land, MERRA-2, and PERSIANN-CDR, comparisons were made with 33 local meteorological stations using statistical metrics such as correlation coefficient (CC), root mean square error (RMSE), and percentage bias (PBIAS). Additionally, the GR4J hydrological model was employed in four watersheds to assess model performance with different data combinations. Results showed that AgERA5 and ERA5-Land excelled in daily precipitation estimation, while MERRA-2 had the lowest PET bias. Using reference data for P and PET as model forcings yielded consistent results across basins. However, the performance declined when using gridded products for both P and PET, revealing significant limitations in replicating hydrological processes and emphasizing the need to enhance these products for areas with limited observational data.