Estimation of solar radiation based on air temperature and application with the DSSAT v4.5 peanut and rice simulation models in Thailand

摘要: a b s t r c Estimation of solar radiation (SRAD) from daily air temperature by the modified Bristow-Campbell (B-C) model requires three empirical coefficients that are area specific. Previous estimates these for Thailand were based on limited data without any evaluation. Accurate estimation radia- tion has become more important with wider application environmental models. The objective this study was to calibrate and evaluate broader range data. Meteorological 2008 2011 obtained eight weather stations, in North (Chiang Mai, Chiang Rai Nakhon Sawan), two Northeast (Khon Kaen Ubon Ratchathani), one Central (Lop Buri) South (Chumporn Surat Thani). Data 2010 all locations except used calibration remaining as independent sets coefficient determination (R 2 ), root mean square error (RMSE) normalized (RMSEn) indicators agreement between observed calculated SRAD. results showed accept- able (R2 = 0.56, RMSE 3.07 MJ m−2 d−1 RMSEn 17.5%). derived values 0.63, 1.89 1.54. These new performed well during evaluation 13 four regions, R , 0.39-0.70, 2.42-3.79 14.0-21.7%, respectively. In addition, simulations using estimated SRAD