VALIDATION OF DIRECT NORMAL SOLAR IRRADIATION ESTIMATES FROM SATELLITE DATA
DOI:
https://doi.org/10.59627/cbens.2014.2211Keywords:
Direct Normal Irradiation, Solar Radiation, GOES satellite, Northeastern BrazilAbstract
This paper presents validations of a satellite-based method for estimating of the direct normal irradiation (Qn) which uses GOES VIS imagery and auxiliary weather informations. The validation was performed by comparison with measurements of solarimetric stations of SONDA network (Petrolina-PE and Natal-RN), during 2007-2008. Analyses of the spatial and temporal variability of Qn in Northeast Brazil (NEB) and mesoregions of Pernambuco and Rio Grande do Norte states are reported. The results shows good linear relations between measured and satellite estimates Qn, with coefficient of determination greater than 0,80. In general, the results evidenced a slight overestimate (MBE = 1,0 and RMSE = 17,8%) for Petrolina, and underestimate (MBE = -8,6 and RMSE = 17,2%) for Natal. These results for Natal station suggest a need of better assessment of surface reflectance at locations near the ocean. However, the values obtained for statistical parameters are similar to those models reported in the literature. It was noticed that the Qn is strongly affected by seasonal weather conditions. These facts suggest the ability of the satellite- based method for providing Qn estimates, particularly for climatic and energy studies.
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