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Validation and calibration of solar radiation equations for estimating daily reference evapotranspiration at cool semi-arid and arid locations
- Tabari, Hossein, Hosseinzadehtalaei, Parisa, Willems, Patrick, Martinez, Christopher
- Hydrological sciences journal 2016 v.61 no.3 pp. 610-619
- equations, evapotranspiration, models, semiarid zones, solar radiation, Iran
- In this work, the applicability of 12 solar radiation (R S) estimation models and their impacts on daily reference evapotranspiration (ET ₒ) 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 ₒ estimates by the calibrated R S 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 ₒ by the calibrated R S 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.