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利用河南省渑池县的日照等观测资料,对渑池县近30 a来的日照时间变化特征进行分析。结果表明:渑池县的年日照时间呈现出小幅度减少的趋势,其气候倾向率为-6.54/10 a。其中在20世纪90年代年日照时间的变化比较明显;夏、秋、冬的日照时间表现出减少的趋势,但气候倾向率不尽相同,只有春季的气候倾向率表现出了增加的趋势;渑池县日照时间的月变化比较明显,出现这种现象的原因是由于副热带高压南移造成的。5月的日照时间最高,而2月的日照时间最低;相对湿度和总云量的变化不是造成渑池县日照时间减小的主要原因,最主要的原因在于能见度下降引起的。
Based on the observation data of sunshine in Mianchi County, Henan Province, the characteristics of sunshine time in Mianchi County during the past 30 years were analyzed. The results showed that the annual sunshine duration of Mianchi County showed a slight decrease trend with the climate tendency rate of -6.54 / 10 a. Among them, the change of sunshine time in the 1990s was quite obvious. The sunshine hours of summer, autumn and winter showed a decreasing trend, but the climate tendencies were different. Only the spring climate trend showed an increasing trend. The monthly variation of sunshine time in the county is more obvious. The reason for this phenomenon is due to the southward shift of the subtropical high. The sunshine duration was the highest in May and the sunshine duration was the lowest in February. The change of relative humidity and total cloud cover was not the main reason that caused the decrease of sunshine time in Mianchi County. The main reason was the decrease of visibility.