UNB 11.402

Carvalho Júnior, Osmar Abílio de 137 Pimentel, Concepta Margaret McManus 113 Guimarães, Renato Fontes 101 Báo, Sônia Nair 90 Arraes, Virgílio Caixeta 88 Martins, Éder de Souza 82 Mais ... Gomes, Roberto Arnaldo Trancoso 80 Garrafa, Volnei 76 Diniz, Debora 72 Shimizu, Helena Eri 70 Lima, Eduardo Maurício Mendes de 59 Matias-Pereira, José 55 Santos, Leonor Maria Pacheco 55 Peixoto, José Ricardo 52 Felfili, Jeanine Maria 50 Miguel, Luis Felipe 50 Hamann, Edgar Merchán 49 Abbad, Gardênia da Silva 47 Borges-Andrade, Jairo Eduardo 47 Castioni, Remi 46 Anjos, Rafael Sanzio Araújo dos 44 Costa Júnior, Áderson Luiz 44 Zandonadi, Renata Puppin 44 Louvandini, Helder 42 Mota, Licia Maria Henrique da 42 Seidl, Eliane Maria Fleury 42 Tauil, Pedro Luiz 42 Botelho, Raquel Braz Assunção 40 Silva, César Augusto Tibúrcio 40 Zanello, Valeska 39 Ver todos ... menos ...

Marinho, Danilo Nolasco Cortes 1 The objective of this work was to estimate Angström-Prescott equation mean coefficients in Brasília, DF, Brazil, and their effects on the calculations of global radiation (Rs) and reference crop evapotranspiration (ETo). It was used meteorological data from Embrapa Hortaliças weather station, from 1978 to 2003. The mean coefficients were determined by linear regression analysis considering monthly, annual and total periods. Using the calculated coefficients for different periods and those provided by FAO (0.25 and 0.50), Rs and ETo were estimated and their performances were evaluated. Monthly mean coefficient a varied from 0.241 to 0.345, and b from 0.430 to 0.515. Annual mean coefficients a and b were 0.278 and 0.498, and total means were 0.282 and 0.490, respectively. These coefficients did not differ from each other on radiation estimates. The month of July provided the worse estimates and performance. When using calculated Rs estimates with monthly, annual, total and FAO coefficients, estimated values of ETo did not differ from observed ones, providing excellent performance, despite the mean coefficient used. Depending on the final application, it is suggested the use of total mean coefficients due to their easiness to estimate the shortwave radiation. 1

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