The distribution characteristics of total solar radiation in Jiangsu province

The monthly total solar radiation from 3 solar radiation stations in Huaian,Nanjing,and Lusi and the monthly percentage of sunshine from 70 meteorological stations in Jiangsu province were adopted to calculate and analyze the solar radiation distribution across the province by using regular climatological methods.The result shows that the solar radiation in Jiangsu is dependent on season,it is higher in summer and lower in winter and moderate in spring and fall.It is higher in the north region and lower in the south.The annual variation of solar radiation is apparent bimodal distribution with the maximum in May and in late July and early August,the relative low stage appears from late June to early July,which is coincident with plum rains in Jiangsu and Huaihe.