太場エネルギー利用のための分光日射量の測定と整理 : 第1報, Birdのモデルに基づく分光日射特性の比較

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Since August 1994, spectral measurements of the global and direct insolations have been carried out by the authors. According to the intensity of the insolation, the results measured were arranged by classifing into rank of l00 W/m^2 each ; then, comparing the insolation with Bird's model, the factors of solar altitude, turbidity of atmosphere, precipitable water and albedo of the earth were investigated. Consequently, on a clear day on which cloud amount was less than six, the spectra corresponding to the global and direct insolations could be estimated. Different shapes of the spectra in summer and winter depended on the precipitable water ; the spectrum of the direct insolation was affected by the turbidity and precipitable water, while the spectrum of global insolation was hardly affected by these factors. In addition, on the basis of Bird's model the direct insolation and transmittance of atmosphere were calculated under several atmospheric conditions, and the influence of solar altitude to the transmittance of atmosphere was clarified.
1996-07-25