关键词: 日照时数, Kriging插值, 周期分析, 宁夏

Abstract: Seasonal, annual, and decadal changes of sunshine hour in Ningxia in recent 50 years were analyzed by the use of methods of climate tendency rate analysis, Kriging interpolation and wavelet analysis. The results showed that the annual sunshine hour decreased with an average rate of -2.23 h/10a, and the decrease trend was significant after 2000; The sunshine hour decreased in winter, but increased in spring; The annual sunshine hour increased from north to south, and the sunshine hour in the north region and the middle region decreased, but increased in the south region; The extent of decrease in Yinchuan is the maximum, and the extent of increase in Guyuan is the maximum. Morlet wavelet analysis of sunshine hour change in Ningxia showed that there were periods of 11-year and 7-year in the north region, 5-year and 4-year in the middle region, and 7-year and 4-year in the south region, respectively.

Key words: sunshine hour, Kriging interpolation, wavelet analysis, Ningxia