Daily reference crop evapotranspiration with reduced data sets in the humid environments of Azores islands using estimates of actual vapor pressure, solar radiation, and wind speed

Published on Nov 1, 2018in Theoretical and Applied Climatology 2.32
· DOI :10.1007/s00704-017-2329-9
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)
Abstract
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 in the humid climate of Azores islands is assessed in this study. Results show that after locally and seasonally calibrating the temperature adjustment factor a d used for dew point temperature (T dew) computation from mean temperature, ETo estimations shown small bias and small RMSE ranging from 0.15 to 0.53 mm day−1. When R s data are missing, their estimation from the temperature difference (T max−T min), using a locally and seasonal calibrated radiation adjustment coefficient (k Rs), yielded highly accurate ETo estimates, with RMSE averaging 0.41 mm day−1 and ranging from 0.33 to 0.58 mm day−1. If wind speed observations are missing, the use of the default u 2 = 2 m s−1, or 3 m s−1 in case of weather measurements over clipped grass in airports, revealed appropriated even for the windy locations (u 2 > 4 m s−1), with RMSE < 0.36 mm day−1. The appropriateness of procedure to estimating the missing values of e a, R s, and u 2 was confirmed.
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  • Citations (4)
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References49
Published on Aug 1, 2016in Theoretical and Applied Climatology 2.32
Gustavo Bastos Lyra9
Estimated H-index: 9
(Universidade Federal Rural do Rio de Janeiro),
Sidney Sára Zanetti6
Estimated H-index: 6
(Universidade Federal do Espírito Santo)
+ 4 AuthorsMarco Antonio Maringolo Lemes3
Estimated H-index: 3
(Federal University of Alagoas)
The monthly global solar irradiation (Hg) was estimated using the Hargreaves–Samani model (HS) with three different approaches for determining the kr coefficient and using an artificial neural network (ANN). The data consisted of long-term climate series measured at eight conventional meteorological stations in the state of Alagoas and its borders in northeastern Brazil. The approaches to determine the kr coefficient of the HS model included (i) the method proposed by Hargreaves (1994) (0.190 an...
3 Citations Source Cite
Published on Oct 1, 2015in Journal of Hydrology 3.73
Pau Martí17
Estimated H-index: 17
(Polytechnic University of Valencia),
Manuel Zarzo14
Estimated H-index: 14
(Polytechnic University of Valencia)
+ 1 AuthorsJoan Girona1
Estimated H-index: 1
Summary The application of simple empirical equations for estimating reference evapotranspiration (ET o ) is the only alternative in many cases to robust approaches with high input requirements, especially at the local scale. In particular, temperature-based approaches present a high potential applicability, among others, because temperature might explain a high amount of ET o variability, and also because it can be measured easily and is one of the most available climatic inputs. One of the mos...
19 Citations Source Cite
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 Mar 15, 2014in International Journal of Climatology 3.10
Thomas E. Cropper5
Estimated H-index: 5
(University of Sheffield),
Edward Hanna38
Estimated H-index: 38
(University of Sheffield)
New monthly, long-running, continuous surface air temperature records for four island chains throughout the Macaronesian biogeographical zone in the North Atlantic Ocean are presented. The records run from 1865 for the Azores and Madeira, 1885 for the Canary Islands and 1895 for Cape Verde. Recent (1981–2010) warming across these islands is significant in summer (JJA) for the Canary Islands, Cape Verde and Madeira, ranging from 0.40 to 0.46 °C per decade. Annually, the temperature trends across ...
25 Citations Source Cite
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 Oct 1, 2008in Agricultural and Forest Meteorology 4.04
A. Bandyopadhyay7
Estimated H-index: 7
,
A. Bhadra7
Estimated H-index: 7
(North Eastern Regional Institute of Science and Technology)
+ 1 AuthorsRajendra Singh23
Estimated H-index: 23
(Indian Institute of Technology Kharagpur)
Abstract Solar radiation ( R s ), a very important variable in agricultural meteorology, is measured at a very limited number of meteorological stations worldwide. However, a number of methods are reported in the literature for estimating R s from routinely measured air temperature extremes, the accuracy of which needs to be tested. R s was thus estimated by different methods for 29 stations distributed throughout India. The methods compared were Hargreaves [Hargreaves, G.H., 1994. Simplified co...
53 Citations Source Cite
Published on May 1, 1999in Agricultural Water Management 3.18
Eduardo Brito de Azevedo1
Estimated H-index: 1
,
Luis S. Pereira50
Estimated H-index: 50
(Technical University of Lisbon),
Bernard Itier5
Estimated H-index: 5
(Institut national de la recherche agronomique)
In small volcanic islands the local scale climate is influenced by the regional scale climate and by the orography and orientation of air masses movement over the islands. A model was developed in a GIS environment to generate local scale climate variables from those observed at the synoptic scale, from coastal weather stations. An advective submodel, based on the Foehn effect and assuming the conservation of mass and energy, computes local scale air temperature, relative humidity, clouds occurr...
50 Citations Source Cite
B. Temesgen2
Estimated H-index: 2
,
R.G. Allen2
Estimated H-index: 2
,
D.T. Jensen2
Estimated H-index: 2
Adjustment coefficients for air temperature and dew point temperature measurements at dry weather sites are determined for predicting reference evapotranspirations (ET0) for irrigated conditions. Seasonal and regional variation in changes in temperature parameters versus the ratio of effective precipitation to ET0 are analyzed. The determined adjustment coefficients are tested for validity using weather data from reference weather stations, and paired reference and dry stations. The effects of a...
74 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
  • References (49)
  • Citations (4)
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Cited By4
Published on Oct 1, 2018in Theoretical and Applied Climatology 2.32
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)
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 pr...
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 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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Published on Mar 19, 2019in Theoretical and Applied Climatology 2.32
Zhengyao Liu1
Estimated H-index: 1
(Shaanxi Normal University),
Zhibao Dong (Shaanxi Normal University)+ 2 AuthorsNan Xiao1
Estimated H-index: 1
(Shaanxi Normal University)
The characteristics of eolian sand activity are greatly influenced by the wind regime, and wind regimes have been changing around the world in response to climate change. This has also been true in the desert area of northwestern China since 1965, and these changes have changed the region’s landforms, sandstorm frequency, and desertification. In this study, we analyzed the temporal and spatial variation of the region’s near-surface wind field since 1965. We found an average annual wind speed dur...
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