Daily reference crop evapotranspiration in the humid environments of Azores islands using reduced data sets: accuracy of FAO-PM temperature and Hargreaves-Samani methods

Published on Oct 1, 2018in Theoretical and Applied Climatology 2.32
· DOI :10.1007/s00704-017-2295-2
Paula Paredes18
Estimated H-index: 18
(University of Lisbon),
J. C. Fontes4
Estimated H-index: 4
(University of the Azores)
+ 1 AuthorsLuis S. Pereira50
Estimated H-index: 50
(University of Lisbon)
Abstract
Reference crop evapotranspiration (ETo) estimations using the FAO Penman-Monteith equation (PM-ETo) require several weather variables that are often not available. Then, ETo may be computed with procedures proposed in FAO56, either using the PM-ETo equation with temperature estimates of actual vapor pressure (e a) and solar radiation (R s), and default wind speed values (u 2), the PMT method, or using the Hargreaves-Samani equation (HS). The accuracy of estimates of daily e a, R s, and u 2 is provided in a companion paper (Paredes et al. 2017) applied to data of 20 locations distributed through eight islands of Azores, thus focusing on humid environments. Both estimation procedures using the PMT method (ETo PMT) and the HS equation (ETo HS) were assessed by statistically comparing their results with those obtained for the PM-ETo with data of the same 20 locations. Results show that both approaches provide for accurate ETo estimations, with RMSE for PMT ranging 0.48–0.73 mm day−1 and for HS varying 0.47–0.86 mm day−1. It was observed that ETo PMT is linearly related with PM-ETo, while non-linearity was observed for ETo HS in weather stations located at high elevation. Impacts of wind were not important for HS but required proper adjustments in the case of PMT. Results show that the PMT approach is more accurate than HS. Moreover, PMT allows the use of observed variables together with estimators of the missing ones, which improves the accuracy of the PMT approach. The preference for the PMT method, fully based upon the PM-ETo equation, is therefore obvious.
  • References (43)
  • Citations (4)
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References43
George H. Hargreaves8
Estimated H-index: 8
,
Zohrab Samani15
Estimated H-index: 15
Increasing population and needs for an augmented food supply give greater importance to improved procedures for estimating agricultural water requirements both for irrigation and for rain-fed agriculture. Four methods for estimating potential evapotranspiration are compared and evaluated. These are the Class A evaporation pan located in an irrigated pasture area, the Hargreaves equation, the Jensen-Haise eguation, and the Blaney-Criddle method. The evaporation pan is rated as superior to the oth...
834 Citations
Published on Jun 1, 2008in Agricultural Water Management 3.18
M. Jabloun1
Estimated H-index: 1
,
A Sahli5
Estimated H-index: 5
The Food and Agriculture Organization of the United Nations had improved the version of the Penman-Monteith method (FAO-56 PM) which has recently been proposed as the standard for estimating reference evapotranspiration (ETo). Unfortunately, some weather variables, especially solar radiation, relative humidity and wind speed, are often missing which could impede the estimation of ETo with the FAO-56 PM method. To overcome the problem of the availability of climatic parameters, procedures to esti...
149 Citations Source Cite
Published on Jan 1, 2005in Applied Engineering in Agriculture 0.50
R. E. Yoder12
Estimated H-index: 12
,
Lameck O. Odhiambo10
Estimated H-index: 10
,
Wesley C. Wright8
Estimated H-index: 8
Estimated daily reference crop evapotranspiration (ETo) is normally used to determine the water requirement of crops using the crop factor method. Many ETo estimation methods have been developed for different types of climatic data, and the accuracy of these methods varies with climatic conditions. In this study, pair-wise comparisons were made between daily ETo estimated from eight different ETo equations and ETo measured by lysimeter to provide information helpful in selecting an appropriate E...
97 Citations Source Cite
Published on May 1, 2008in Agricultural Water Management 3.18
Gorka Landeras11
Estimated H-index: 11
,
Amaia Ortiz-Barredo3
Estimated H-index: 3
,
José Javier López4
Estimated H-index: 4
Reference evapotranspiration (ETo) determination is a key factor for water balance and irrigation scheduling. Evapotranspiration can be measured directly by high-cost micrometeorological techniques, or estimated by mathematical models. The combination equation of Penman-Monteith, modified by Allen et al. [Allen, R.G., Pereira, L.S., Raes, D., Smith, M., 1998. Crop evapotranspiration. Guidelines for computing crop water requirements. FAO Irrigation and Drainage, Paper no. 56. FAO, Rome] (PM56), i...
143 Citations Source Cite
Published on Nov 1, 2009in Water Resources Management 2.64
Slavisa Trajkovic17
Estimated H-index: 17
(University of Niš),
Srdjan Kolakovic4
Estimated H-index: 4
Five reference evapotranspiration (ET0) equations are evaluated using data from seven humid locations. The equations evaluated include Hargreaves, Thornthwaite, Turc, Priestley–Taylor, and Jensen–Haise. The objective of this study is to evaluate ET0 estimated by these equations against the corresponding values estimated using the standardized FAO-56 Penman–Monteith (PM) equation. For each location, ET0 estimates by the all equations were statistically compared with FAO-56 PM ET0 estimates. The T...
96 Citations Source Cite
Published on Feb 1, 2013in Journal of Hydrology 3.73
Jalal Shiri29
Estimated H-index: 29
(University of Tabriz),
Amir Hossein Nazemi11
Estimated H-index: 11
(University of Tabriz)
+ 4 AuthorsPau Martí17
Estimated H-index: 17
(Polytechnic University of Valencia)
Summary Accurate estimation of reference evapotranspiration is important for irrigation scheduling, water resources management and planning and other agricultural water management issues. In the present paper, the capabilities of generalized neuro-fuzzy models were evaluated for estimating reference evapotranspiration using two separate sets of weather data from humid and non-humid regions of Spain and Iran. In this way, the data from some weather stations in the Basque Country and Valencia regi...
30 Citations Source Cite
Published on Apr 1, 1997in Journal of Hydrologic Engineering 1.58
Richard G. Allen46
Estimated H-index: 46
Procedures are introduced for self-calibrating an equation for estimating solar radiation (\iR\i\ds) in the absence of measurements. The self-calibration is based on computed clear sky solar radiation envelopes and uses daily maximum and minimum air temperature. The resulting calibration can predict both daily and monthly average \iR\i\ds parameters in evapotranspiration equations. The method was tested at nine locations in the United States representing low, medium, and high elevations, semi-ar...
181 Citations Source Cite
Published on Nov 1, 2014in Theoretical and Applied Climatology 2.32
AladenolaOlanike5
Estimated H-index: 5
(McGill University),
A MadramootooChandra28
Estimated H-index: 28
(McGill University)
The accuracy of nine solar radiation (R s ) estimation models and their effects on reference evapotranspiration (ET o ) were evaluated using data from eight meteorological stations in Canada. The R s estimation models were FAO recommended Angstrom-Prescott (A-P) coefficients, locally calibrated A-P coefficients, Hargreaves and Samani (H-S) (1982), Annandale et al., (2002), Allen (1995), Self-Calibrating (S-C, Allen, 1997), Samani (2000), Mahmood and Hubbard (M-H) (2002), and Bristow and Campbell...
10 Citations Source Cite
Published on Jul 1, 2007in Agricultural and Forest Meteorology 4.04
Jiabing Cai3
Estimated H-index: 3
,
Yu Liu10
Estimated H-index: 10
+ 1 AuthorsLuis S. Pereira50
Estimated H-index: 50
(Technical University of Lisbon)
Real-time irrigation management and water resources allocation need real-time prediction of daily reference evapotranspiration (ETo). Thus, adopting the FAO Penman–Monteith (FAO-PM) equation as the standard for ETo estimation, an attempt was made to predict daily ETo using the public weather forecast messages available in China. These involve the cloudiness conditions, daily maximum and minimum temperature, and wind speed scales. An analytical method (AM) was developed to translate daily weather...
147 Citations Source Cite
Suat Irmak28
Estimated H-index: 28
,
Richard G. Allen46
Estimated H-index: 46
,
E. B. Whitty1
Estimated H-index: 1
Efficient use of natural water resources in agriculture is becoming an important issue in Florida because of the rapid depletion of freshwater resources due to the increasing trend of industrial development and population. Reliable and consistent estimates of evapotranspiration (ET) are a key element of managing water resources efficiently. Since the 1940s numerous grass- and alfalfa-reference evapotranspiration (ET\I\do\N and ET\I\dr\N, respectively) equations have been developed and used by re...
108 Citations Source Cite
  • References (43)
  • Citations (4)
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Cited By4
Published on Nov 1, 2018in Theoretical and Applied Climatology 2.32
Paula Paredes18
Estimated H-index: 18
(Instituto Superior de Agronomia),
J. C. Fontes4
Estimated H-index: 4
(University of the Azores)
+ 1 AuthorsLuis S. Pereira50
Estimated H-index: 50
(Instituto Superior de Agronomia)
Reference crop evapotranspiration (ETo) estimations using the FAO Penman-Monteith equation (PM-ETo) require a set of weather data including maximum and minimum air temperatures (T max, T min), actual vapor pressure (e a), solar radiation (R s), and wind speed (u 2). However, those data are often not available, or data sets are incomplete due to missing values. A set of procedures were proposed in FAO56 (Allen et al. 1998) to overcome these limitations, and which accuracy for estimating daily ETo...
4 Citations Source Cite
Published on Nov 1, 2018in Agricultural Water Management 3.18
Paula Paredes18
Estimated H-index: 18
(Instituto Politécnico Nacional),
Diogo S. Martins6
Estimated H-index: 6
(Instituto Superior de Agronomia)
+ 2 AuthorsCarlos Pires9
Estimated H-index: 9
(University of Lisbon)
Abstract This study aims at assessing the accuracy of estimating daily grass reference evapotranspiration (PM-ET o ) computed with ERA-Interim reanalysis products, as well as to assess the quality of reanalysis products as predictors of daily maximum and minimum temperature, net radiation, dew point temperature and wind speed, which are used to compute PM-ET o . With this propose, ET o computed from local observations of weather variables in 24 weather stations distributed across Continental Por...
1 Citations Source Cite
Published on Mar 1, 2019in Journal of Hydrology 3.73
Jalal Shiri29
Estimated H-index: 29
(University of Tabriz)
Abstract Among the reference evapotranspiration ( ET o ) equations, temperature-based and radiation-based equations have been accepted as promising approaches when the available meteorological data are limited. The present paper aimed at assessing this general implication in island environments, which might be generally volatile than the interior/coastal zones. Using data from five island locations of Iran, daily ET o values were calculated by the benchmark FAO-Penman-Monteith (FAO56-PM) model, ...
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Published on Apr 1, 2019in Agricultural Water Management 3.18
Paula Paredes18
Estimated H-index: 18
(Instituto Superior de Agronomia),
Luis S. Pereira50
Estimated H-index: 50
(Instituto Superior de Agronomia)
Abstract The computation of the reference crop evapotranspiration (ET o ) using the FAO Penman-Monteith equation (PM-ET o ) requires data on maximum and minimum air temperatures (T max , T min ), vapour pressure deficit (VPD), solar radiation (R s ) and wind speed at 2 m height (u 2 ). However, those data are often not available, or data sets may be incomplete or have questionable quality. Various procedures were proposed in FAO56 to overcome these limitations and an abundant literature has been...
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