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Evaluation of FAO-56 Procedures for Estimating Reference Evapotranspiration Using Missing Climatic Data for a Brazilian Tropical Savanna

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Programa de Pós-Graduação Tecnologias Ambientais, Universidade Federal de Mato Grosso do Sul, Campo Grande 79070-900, Brazil
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Biological Sciences Department, California State University, San Marcos, CA 92096, USA
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Programa de Pós Graduação em Física Ambiental, Instituto de Física, Universidade Federal de Mato Grosso, Cuiabá 78060-900, Brazil
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Faculdade de Meteorologia, Instituto de Geociências, Universidade Federal do Pará, Belém 66075-110, Brazil
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Departamento de Solos e Engenharia Rural, Faculdade de Agronomia e Zootecnia, Universidade Federal de Mato Grosso, Cuiabá 78060-900, Brazil
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Department of Disaster Management, Begum Rokeya University, Rangpur 5400, Bangladesh
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Laboratório de Ciências Atmosféricas, Universidade Federal de Mato Grosso do Sul, Campo Grande 79070-900, Brazil
*
Author to whom correspondence should be addressed.
Academic Editor: Antonio Lo Porto
Water 2021, 13(13), 1763; https://doi.org/10.3390/w13131763
Received: 22 May 2021 / Revised: 14 June 2021 / Accepted: 20 June 2021 / Published: 26 June 2021
(This article belongs to the Section Biodiversity and Functionality of Aquatic Ecosystems)
The Brazilian savanna (Cerrado) has been heavily impacted by agricultural activities over the last four to five decades, and reliable estimates of reference evapotranspiration (ETo) are needed for water resource management and irrigation agriculture. The Penman–Monteith (PM) is one of the most accepted models for ETo estimation, but it requires many inputs that are not commonly available. Therefore, assessing the FAO guidelines to compute ETo when meteorological data are missing could lead to a better understanding of which variables are critically important for reliable estimates of ETo and how climatic variables are related to water requirements and atmospheric demands. In this study, ETo was computed for a grass-dominated part of the Cerrado from April 2010 to August 2019. We tested 12 different scenarios considering radiation, relative humidity, and/or wind speed as missing climatic data using guidelines given by the FAO. Our results presented that wind speed and actual vapor pressure do not affect ETo estimates as much as the other climatic variables; therefore, in the Cerrado’s conditions, wind speed and relative humidity measurements are less required than temperature and radiation data. When radiation data were missing, the computed ETo was overestimated compared to the benchmark. FAO procedures to estimate the net radiation presented good results during the wet season; however, during the dry season, their results were overestimated because the method could not estimate negative Rn. Our results indicate that radiation data have the highest impact on ETo for our study area and presumably for regions with similar climatic conditions. In addition, those FAO procedures for estimating radiation are not suitable when radiation data are missing. View Full-Text
Keywords: reference evapotranspiration; FAO Penman–Monteith; limited data; Cerrado reference evapotranspiration; FAO Penman–Monteith; limited data; Cerrado
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MDPI and ACS Style

Valle Júnior, L.C.G.d.; Vourlitis, G.L.; Curado, L.F.A.; Palácios, R.d.S.; Nogueira, J.d.S.; Lobo, F.d.A.; Islam, A.R.M.T.; Rodrigues, T.R. Evaluation of FAO-56 Procedures for Estimating Reference Evapotranspiration Using Missing Climatic Data for a Brazilian Tropical Savanna. Water 2021, 13, 1763. https://doi.org/10.3390/w13131763

AMA Style

Valle Júnior LCGd, Vourlitis GL, Curado LFA, Palácios RdS, Nogueira JdS, Lobo FdA, Islam ARMT, Rodrigues TR. Evaluation of FAO-56 Procedures for Estimating Reference Evapotranspiration Using Missing Climatic Data for a Brazilian Tropical Savanna. Water. 2021; 13(13):1763. https://doi.org/10.3390/w13131763

Chicago/Turabian Style

Valle Júnior, Luiz C.G.d., George L. Vourlitis, Leone F.A. Curado, Rafael d.S. Palácios, José d.S. Nogueira, Francisco d.A. Lobo, Abu R.M.T. Islam, and Thiago R. Rodrigues 2021. "Evaluation of FAO-56 Procedures for Estimating Reference Evapotranspiration Using Missing Climatic Data for a Brazilian Tropical Savanna" Water 13, no. 13: 1763. https://doi.org/10.3390/w13131763

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