Fixed versus variable bulk canopy resistance for reference evapotranspiration estimation using the Penman–Monteith equation under semiarid conditions

By S. Lecina, A. Martínez-cob, P. Pérez, F. Villalobos, J. Baselga. 2003

96 citations recorded by the source corpus.

Abstract In this paper, daily ET0 estimates at two semiarid locations, Zaragoza and Cordoba, were obtained from the Penman–Monteith equation using either fixed (70 s m−1) or variable rc values. Variable rc values were computed with two models, Katerji and Perrier, and Todorovic. Daily ET0 estimates were computed from 24-h meteorological averages or from the sum of hourly estimates. Daily ET0 measured values were obtained from a weighing lysimeter (Zaragoza) and an eddy covariance system (Cordoba). There was a good agreement at both locations between estimated and measured ET0 values using a fixed rc value and 24-h meteorological averages. Estimates obtained from the sum of hourly estimates were somewhat worse. When 24-h meteorological averages were used, the Katerji and Perrier model for variable rc slightly improved ET0 estimates at both locations. But that improvement does not support the effort to locally calibrate that model. When daily ET0 estimates were obtained from the sum of hourly estimates, the Todorovic model improved the estimation at Zaragoza and, at a lesser degree, at Cordoba. Under the semiarid conditions of the two studied locations, the use of the Todorovic model is recommended to get hourly ET0 estimates from which daily estimates can be obtained. If 24-h meteorological averages are used, a fixed rc value as proposed by Allen et al. [Crop evapotranspiration: guidelines for computing crop water requirements, FAO Irrigation and Drainage Paper No. 56, FAO, Rome, 1998] should be enough for accurate ET0 estimates.

Subfields: Global and Planetary Change, Soil Science, Water Science and Technology

View Paper: https://www.semanticscholar.org/paper/86d524bddb851f62c77c353229abfb1fa8f4d62d

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In Global and Planetary Change

In Soil Science

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R. G. Allen

Citations in the corpus

A simple parameterization of bulk canopy resistance from climatic variables for estimating hourly evapotranspiration (2006, methodology): “Results cited in a previous work (Lecina et al., 2003) showed that daily ETo estimates could be obtained with sufficient accuray using the PM method.”
A recommendation on standardized surface resistance for hourly calculation of reference ETo by the FAO56 Penman-Monteith method (2006, methodology): “…reliable, and desirable constant for 24-h calculation time steps for the standardization of ETo with sufficiently good accuracy to serve as a standardized reference and evaporative index (Allen and Fisher, 1990; Ventura et al., 1999; Todorovic, 1999; Lecina et al., 2003; ASCE-EWRI, 2005).”
Crop Evapotranspiration (ET) Estimation Models: A Review and Discussion of the Applicability and Limitations of ET Methods (2015, methodology): “Furthermore, Lecina et al. (2003) didn’t find any improvement in ET estimates using the KP model.”
Parameterizing canopy resistance using mechanistic and semi‐empirical estimates of hourly evapotranspiration: critical evaluation for irrigated crops in the Mediterranean (2011, methodology): “Recent studies (Lecina et al., 2003; Steduto et al., 2003; Pauwels and Samson, 2006; Perez et al., 2006; Shi et al., 2008) compared the suitability of mechanistic and semi-empirical approaches to estimate the resistance rc or E.”
Calibration and validation of four common ET0 estimation equations by lysimeter data in a semi-arid environment (2012, methodology): “( 2003 ) compared the daily ET 0 estimated using the Penman–Monteith method with fixed and variable canopy resistance ( r c ) with daily ET 0 determined by weighing lysimeter in Zaragoza, on the terraces of Gallego River, ∼8 km north of its mouth into the Ebro River.”