Radiação solar estimada com base na temperatura do ar para três regiões de Minas Gerais
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Data
2012
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Resumo
The incident solar radiation (R s ) is an important variable in agricultural studies, particularly for the
estimation of evapotranspiration and yield models. However, its measurement is not commonly performed
in conventional meteorological stations. The aim of this study was to evaluate nine empirical models to
estimate R s from the temperature for the Metropolitan, Vale do Rio Doce and Zona da Mata areas in Minas
Gerais State, Brazil. The models used were Hargreaves, Annandale, Chen, Bristow & Campbell, Donatelli
& Campbell and Hunt. Data used were obtained by R s daily automatic weather stations installed in these
regions and belonging to Instituto Nacional de Meteorologia (INMET). For all models local calibration
coefficients were derived. The performance of each method was evaluated using the following statistical
indicators: coefficient of determination (R 2 ), root mean square error (RMSE), mean bias error (MBE) and
test-t. The little difference between the models evaluated suggests that any of these models may be used.
However, given the simplicity, performance and significance, the model of Hargreaves, calibrated and
with two coefficients, is the most suitable for estimating incident solar radiation.
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Calibração, Hargreaves, Equações empíricas, Bristow-Campbell, Calibration, Bristow-Campbell, Hargreaves, Empirical equations
Citação
SILVA, Cláudio R. da; SILVA, Valdiney J. da; ALVES JÚNIOR, José; CARVALHO, Hudson de P. Radiação solar estimada com base na temperatura do ar para três regiões de Minas Gerais. Revista Brasileira de Engenharia Agrícola e Ambiental, Campina Grande, v. 16, n. 3, p. 281-288, 2012.