Validation and calibration of solar radiation equations for estimating daily reference evapotranspiration at cool semi-arid and arid locations

Abstract:

In this work, the applicability of 12 solar radiation (R<inf>S</inf>) estimation models and their impacts on daily reference evapotranspiration (ET<inf>o</inf>) estimates using the Penman‐Monteith FAO-56 (PMF-56) method were tested under cool arid and semi-arid conditions in Iran. The results indicated that the average increase in accuracy of the ET<inf>o</inf> estimates by the calibrated R<inf>S</inf> models, quantified by the decrease in RMSE, was 2.8% and 6.4% for semi-arid and arid climates, respectively. Mean daily deviations in the estimated ET<inf>o</inf> by the calibrated R<inf>S</inf> equations in semi-arid climates varied from −0.283 mm/d^-1 for the Glover‐McCulloch model to 0.080 mm/d for the El-Sebaii model, with an average of −0.109 mm/d^-1, and in arid climates, they ranged from −0.522 mm/d^-1 for the Samani model to 0.668 mm/d for the El-Sebaii model, with an average of 0.125 mm/d^-1.

Año de publicación:

2016

Keywords:

• Climate
• evapotranspiration calculation
• Calibration
• radiation estimation
• Iran

Fuente:

scopus