THE ANALYSIS OF VARIATION CHARACTERISTICS OF SUNSHINE IN THE RECENT 46 YEARS IN KUNMING

The variation characteristics of sunshinehours and the relation between sunshine hours and relative sunshine,total cloudiness,lower cloudines,water vapor pressure and visibility from 1961 to 2006 in Kunming City are analyzed.The results show:sunshine hours has greatly decreased in the recent 46 years,with the breadth of 115 h/10 a and decreased fastest in spring and summer.The mutation of sunshine hours occurred in1980.Relative sunshine and sunshine hours are in line with changing trends.Lower cloudines,total cloudiness and water vapor pressure are slightly increasing trend.The significantly negative correlation exits between sunshine hours and total cloud cover,water vapor pressure which are the major factors that make sunshine hours reduce.Visibility drop,which show that increases in atmospheric aerosols and effect sunshine hours.