Variation Characteristics of Sunshine Hours in Souning County in 50 Years

Base on the sunshine hours data of Souning County Meteorological Bureau,Fujian Province from 1961 to 2010,we made a comprehensive analysis about the mutation characteristics of sunshine time of years,season,month change trend and other climate change.The results showed that:The sunshine hours in Shouning County reduced in nearly 50 years,and the cli-mate tendency rate is-33.4 h/10 a. Interannual variability is obvious:The difference between the peak value(1963) is 797.7 h.The seasonal difference in sunshine hours was evident, and decreasing amplitude in season was summer, winter, spring and autumn in turn.As for the months of sunshine hours change,there were only 4 month(April, May, June, November) Showed a trend of increase,and other months showed trend of decrease.Use Cumulative anomaly curve method to test annual sunshine hours,the results showed that: Annual sunshine hours had a sudden change in 1988. Characterized by: since 1988, sunshine hours stage from more to less.