Characteristic analysis of the temporal and spatial distribution of sunshine duration in the upper and middle reaches of Huaihe River Basin
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Abstract:
In order to reveal the spatial-temporal variation characteristics of sunshine duration in the upper and middle reaches of Huaihe River Basin and determine the year of mutation, we adopted such methods as the climate tendency rate, Mann-Kendall trend and mutation test, sliding t-test, and Kriging interpolation, and analyzed the spatial-temporal variation characteristics of sunshine duration based on the data of sunshine duration from 1960 to 2014. The results indicated that the sunshine duration in the past 55 years decreased to a lower level in the 1980s; the annual sunshine duration decreased by about 102.2 h every 10 years; and the climate tendency rates of sunshine duration in the four seasons were as follows: summer (-48.8 h/10a), winter (-29.3 h/10a), autumn (-19.7 h/10a), and spring(-5.4 h/10a). The sunshine duration in a year and in all three seasons except spring showed a significant decreasing trend. Spatially, the decreasing trend of sunshine duration was more obvious and sharp in the middle of the northern basin (near Shangqiu station) and in the northwest (near Zhengzhou and Baofeng stations) (Z<-2), but the decrease was small in the east (except for Xuyi station). The highly significant mutation year of annual and summer sunshine durations was 1980, and the weakly significant mutation year of annual sunshine duration was 1984. The mutation years of autumn and winter were 1999 and 1983 respectively, and the mutation year of spring was in the 1970s. The research results are expected to provide scientific basis for the climate studies and agricultural production in the upper and middle reaches of Huaihe River Basin.
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