1961-2017年铜仁市降水时间变化特征

利用贵州省铜仁市9个站点1961-2017年月平均降水资料,利用合成分析、突变检验、周期检验等方法,对铜仁市年、季节的降水变化进行统计分析,结果表明：铜仁市年降水时间序列存在16-28年的显著周期变化；1961-2017年间铜仁地区的春季和秋季降水呈显著减少的趋势,而夏季和冬季变化不明显；铜仁市冬季降水存在10年左右的和3年的周期,春季降水存在3年的显著周期；铜仁地区冬季和春季降水存在突变点。

Interannual Variability of Precipitation in Tongren Area from 1961 to 2017

Based on the monthly average precipitation data from 9stations in Tongren City, Guizhou Province from 1961 to 2017. The interannual variations of precipitation in Tongren City were analyzed by synthetic analysis, mutation test and cycle test. The results show that: The annual precipitation time series in Tongren area has a significant cyclical period of 16-30 years. The spring and autumn precipitation in Tongren area showed a significant decrease trend from 1961 to 2017, while there was no significant change trend in summer and winter. In addition to winter, the linear trends of seasonal precipitation at nine stations in Tongren area are consistent. There are 10-years and 3-years cyclical period of winter precipitation in Tongren area, and there is a significant period of 3-years in spring precipitation. There are sudden changes in winter and spring precipitation in Tongren area. Precipitation anomalies are related to abnormal meridional water vapor transport and vertical motion.