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利用青海省海南州贵南县1961~2009年日照时数数据,采用线性倾向估计、相关分析、滑动t检验法等方法,对贵南县近50年日照时数的年、季和月变化特征及其与降水量、云量的关系进行了分析。结果表明,近50年来贵南县年日照时数呈不显著的增加趋势,49年间日照时数共增加了67.2 h,20世纪90年代日照时数最多,70、80年代日照时数变化振幅比较大,日照时数年际变化幅度较大,极差达484.2 h。春、秋、冬各季的季日照时数呈增加趋势,夏季日照时数呈减少的变化趋势。6、8、12月各月日照时数呈减少趋势,其他月份均呈增加趋势。年和四季日照时数与同期总云量、降水量呈显著的负相关。年日照时数在1976和1993年附近的突变现象显著,1976年表现为日照的急剧减少,而1993年后表现为上升趋势。春季在1976年、冬季在1977年也存在突变现象。
Based on the data of sunshine hours from 1961 to 2009 in Guinan County, Hainan Province, Qinghai Province, linearity estimation, correlation analysis and sliding t test were used to analyze the annual, seasonal and monthly variation of sunshine hours in Guinan And its relationship with precipitation and cloud cover were analyzed. The results showed that the annual sunshine hours in Guinan County had no significant increase in the past 50 years. The sunshine duration increased by 67.2 h in 49 years, the highest sunshine hours in the 1990s and the sunshine hours in the 1970s and 1980s Large, sunshine hours interannual variation range, the difference of 484.2 h. The sunshine hours in spring, autumn and winter showed an increasing trend and the sunshine hours in summer showed a decreasing trend. The monthly sunshine hours showed a decreasing trend in each month of June, August and December, and showed an increasing trend in other months. There was a significant negative correlation between sunshine duration in year and seasons and total cloud cover and precipitation in the same period. The annual sunshine duration was markedly abrupt in 1976 and 1993, with a sharp decline in sunshine in 1976 and an upward trend after 1993. Spring in 1976, winter in 1977, there are mutations.