A STUDY ON THE CLASSIFICATION OF CLOUDS USING TIME VARIATION OF THE AMOUNT OF SOLAR RADIATION

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Abstract

 The classification of clouds and its spatial and temporal variation is important to understand the concept of local climate. Thus, this study was carried out to explore the potential for using the statistical analysis (standard deviation) of time series of one hour averaged pyranometer observation to determine the types of clouds in the Matsuyama plain. Instruments were installed at 6 observation points covering the entire study area. Clear sky rate was considered as an index to identify the reduction in the solar radiation due to presence of cloud. The development of high raised cloud such as cirrostratus and cumulus were observed with small and large time standard deviation respectively and clear sky rate between 0.4 - 0.6. Also, the formation of cloud were observed to be high in the urban area and the inland area. This was further verified using the whole sky images taken by the camera installed at Ehime University. The results would be beneficial for the study of the rainfall pattern in different part of Matsuyama plain and to understand the effect of urbanization on the local climate.

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