The influence of cloud cover index on the accuracy of solar irradiance model estimates |
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| Authors: | F R Martins S A B Silva E B Pereira S L Abreu |
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| Institution: | Centre for Weather Forecast and Climate Studies-Brazilian Institute for Space Research (CPTEC-INPE) S?o José dos Campos, Brazil
Solar Energy Laboratory-University of Santa Catarina-LABSOLAR-UFSC, Campus Universitário Trindade, Florianópolis, Brazil
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| Abstract: | Summary Cloud cover index (CCI) obtained from satellite images contains information on cloud amount and their optical thickness. It is the chief climate
data for the assessment of solar energy resources in most radiative transfer models, particularly for the model BRASIL-SR
that is currently operational at CPTEC. The wide range of climate environments in Brazil turns CCI determination into a challenging activity and great effort has been directed to develop new methods and procedures to improve
the accuracy of these estimations from satellite images (Martins 2001; Martins et al. 2003a; Ceballos et al. 2004). This work
demonstrates the influence of CCI determination methods on estimates of surface solar irradiances obtained by the model BRASIL-SR comparing deviations among
ground data and model results. Three techniques using visible and/or thermal infrared images of GOES-8 were employed to generate
the CCI for input into the model BRASIL-SR. The ground-truth data was provided by the solar radiation station located at Caicó/PE,
in Brazilian Northeast region, which is part of the UNEP/GEF project SWERA (Solar and Wind Energy Resources Assessment). Results
have shown that the application of the bi-spectral techniques have reduced mean bias error up to 66% and root mean square
error up to 50% when compared to the usual technique for CCI determination based on the straightforward determination of month-by-month extremes for maximum and minimum cloud states.
Correspondence: Fernando R. Martins, Brazilian Institute for Space Research (INPE), P.O. Box 515, S?o José dos Campos, 12245-970
S?o Paulo, Brazil |
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