Three decades of reference evapotranspiration estimates for a tropical watershed in the eastern Amazon
ABSTRACT This study estimated the reference evapotranspiration rate (ETo) for the Itacaiúnas River Watershed (IRW), Eastern Amazonia, and measured the accuracy of eight empirical equations: Penman-Monteith (PM), Priestley-Taylor (PT), Hargreaves and Samani (HS), Camargo (CAM), Thornthwaite (TH), Ham...
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| Format: | Article |
| Language: | English |
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Academia Brasileira de Ciências
2017-10-01
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| Series: | Anais da Academia Brasileira de Ciências |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017005025103&lng=en&tlng=en |
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| author | RENATO O. DA SILVA JÚNIOR EVERALDO B. DE SOUZA ALEXANDRA L. TAVARES JOSÉ A. MOTA DOUGLAS B.S. FERREIRA PEDRO W.M. SOUZA-FILHO EDSON J.P. DA ROCHA |
| author_facet | RENATO O. DA SILVA JÚNIOR EVERALDO B. DE SOUZA ALEXANDRA L. TAVARES JOSÉ A. MOTA DOUGLAS B.S. FERREIRA PEDRO W.M. SOUZA-FILHO EDSON J.P. DA ROCHA |
| author_sort | RENATO O. DA SILVA JÚNIOR |
| collection | DOAJ |
| description | ABSTRACT This study estimated the reference evapotranspiration rate (ETo) for the Itacaiúnas River Watershed (IRW), Eastern Amazonia, and measured the accuracy of eight empirical equations: Penman-Monteith (PM), Priestley-Taylor (PT), Hargreaves and Samani (HS), Camargo (CAM), Thornthwaite (TH), Hamon (HM), Kharrufa (KF) and Turc (TC) using monthly data from 1980 to 2013. In addition, it verifies the regional applicability to the IRW using a for the Marabá-PA station. The methods TC and PM (FAO56) presented the best results, which demonstrate that radiation and higher temperatures are the dominant drivers in the Evapotranspiration process, while relative humidity and wind speed have a much smaller impact. The temporal and spatial variability of ETo for IRW show has strong seasonality, increasing during the dry season and decreasing during the rainy season. The statistical analyses at 1% level of significance, indicates that there is no correlation of the residuals between the dry and rainy seasons, and test of the physical parameters such as mean temperature, solar radiation and relative air humidity explains the variations of ETo. |
| first_indexed | 2024-12-10T10:26:30Z |
| format | Article |
| id | doaj.art-49fdc0f176084a37909c4431186f1c45 |
| institution | Directory Open Access Journal |
| issn | 1678-2690 |
| language | English |
| last_indexed | 2024-12-10T10:26:30Z |
| publishDate | 2017-10-01 |
| publisher | Academia Brasileira de Ciências |
| record_format | Article |
| series | Anais da Academia Brasileira de Ciências |
| spelling | doaj.art-49fdc0f176084a37909c4431186f1c452022-12-22T01:52:41ZengAcademia Brasileira de CiênciasAnais da Academia Brasileira de Ciências1678-26902017-10-01010.1590/0001-3765201720170147S0001-37652017005025103Three decades of reference evapotranspiration estimates for a tropical watershed in the eastern AmazonRENATO O. DA SILVA JÚNIOREVERALDO B. DE SOUZAALEXANDRA L. TAVARESJOSÉ A. MOTADOUGLAS B.S. FERREIRAPEDRO W.M. SOUZA-FILHOEDSON J.P. DA ROCHAABSTRACT This study estimated the reference evapotranspiration rate (ETo) for the Itacaiúnas River Watershed (IRW), Eastern Amazonia, and measured the accuracy of eight empirical equations: Penman-Monteith (PM), Priestley-Taylor (PT), Hargreaves and Samani (HS), Camargo (CAM), Thornthwaite (TH), Hamon (HM), Kharrufa (KF) and Turc (TC) using monthly data from 1980 to 2013. In addition, it verifies the regional applicability to the IRW using a for the Marabá-PA station. The methods TC and PM (FAO56) presented the best results, which demonstrate that radiation and higher temperatures are the dominant drivers in the Evapotranspiration process, while relative humidity and wind speed have a much smaller impact. The temporal and spatial variability of ETo for IRW show has strong seasonality, increasing during the dry season and decreasing during the rainy season. The statistical analyses at 1% level of significance, indicates that there is no correlation of the residuals between the dry and rainy seasons, and test of the physical parameters such as mean temperature, solar radiation and relative air humidity explains the variations of ETo.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017005025103&lng=en&tlng=encalibrationdecadeseastern Amazonevapotranspirationmethodswatershed |
| spellingShingle | RENATO O. DA SILVA JÚNIOR EVERALDO B. DE SOUZA ALEXANDRA L. TAVARES JOSÉ A. MOTA DOUGLAS B.S. FERREIRA PEDRO W.M. SOUZA-FILHO EDSON J.P. DA ROCHA Three decades of reference evapotranspiration estimates for a tropical watershed in the eastern Amazon Anais da Academia Brasileira de Ciências calibration decades eastern Amazon evapotranspiration methods watershed |
| title | Three decades of reference evapotranspiration estimates for a tropical watershed in the eastern Amazon |
| title_full | Three decades of reference evapotranspiration estimates for a tropical watershed in the eastern Amazon |
| title_fullStr | Three decades of reference evapotranspiration estimates for a tropical watershed in the eastern Amazon |
| title_full_unstemmed | Three decades of reference evapotranspiration estimates for a tropical watershed in the eastern Amazon |
| title_short | Three decades of reference evapotranspiration estimates for a tropical watershed in the eastern Amazon |
| title_sort | three decades of reference evapotranspiration estimates for a tropical watershed in the eastern amazon |
| topic | calibration decades eastern Amazon evapotranspiration methods watershed |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017005025103&lng=en&tlng=en |
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