Variation Rules and Characteristics of Sunshine Hours in Ta′e Basin at the Last 50 Years

Based on observed data of 4 meteorological stations in Ta′e Basin from 1960 to 2009,this paper analyzed the variation characteristics of annual,seasonal and inter-annual sunshine hours in this region,the series of the sudden change points of sunshine hours were confirmed by Mann-Kendall method.The results indicated that the sunshine hours had some fluctuated increasing trend with the climate tendency annual sunshine hours of 2.9h/10a;Meanwhile,it performed clearer increasing in spring,summer and autumn,especially in spring;Average annual sunshine hours had two sudden change points.There was close negative correlation among sunshine hours,total/low cloud amount and precipitation days with≥0.1 mm precipitation,and the correlations between sunshine hours and total cloud amount weights most.