关键词: 极端降水, 时空特征, Mann-Kendall趋势检验, 小波变换, 昭通市

Abstract:

In this paper, the spatial and temporal distribution of extreme precipitation in different time scales(1 h, 6 h, 24 h) in Zhaotong, Yunnan Province were analyzed based on the data from 19 meteorological stations during 1969-2014. The Mann-Kendall trend test and wavelet transform were used to analyze the period and trend characters of three typical stations (Yudong, Xinhua, and Niujie). Then the Inversed Distance Weight method was used to interpolate the point data into the area. The results show that the trend of extreme precipitation from three typical stations is not obvious (p>0.05). The periods for these three typical stations are 30 a, 15 a and 5-7 a,respectively. The spatial distribution of the extreme precipitation differs greatly from north to south, which is larger in the North and smaller in the South.

Key words: extreme precipitation, spatial and temporal distribution, MannKendall trend test, wavelet transform, Zhaotong City