Analysis of Characteristics of the Change of Sunshine Duration in 50 Years in Panxian
Abstract: In this article, the characteristics of sunlight change of Panxian in past 50 years are analyzed through Climatic trend estimation and Mann-Kendall Climatic examination with the sunshine duration in Panxian Meteorological Station from 1961 to 2010. The results show that the annual sunshine duration in Panxian is 1617.1 h, that the max sunshine duration as 1939.1 h appears in 1978, and that the minimum as 1435.8 h appears in 1976. Every year, the max monthly sunshine duration is 177.1 h in April and the minimum is 103.0 h in October. It takes shape as double peak. From January to April, the sunshine duration increases, and the max amplification appears from February to March; it tops to 46.9 h. As to June, the sunshine duration decreases; the max damping appears from May to June; it tops to 39.5 h. As to August, the sunshine duration increases again, and to October it decreases again. The change of sunshine duration from October to December is not obvious. The annual sunshine duration is on a rise as 5.7 h of 10 years, and the most outstanding rise appears in 1970 s. The change trend of sunshine duration of every season is different. It is on a declining curve in Spring and Summer, and on a rise in Autumn and Winter. There is a sudden change of annual sunshine duration in 1983, and the seasonal sudden change of sunshine duration appears in Spring of 1975 as decreasing and in Autumn of 1993 as increasing; In Summer, it decreases not so.
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