Based on the precipitation from 1960 to 2015 in Yanji City,the multiple time scales of precipitation sequences were studied by the Morlet complex wavelet method.The results showed that the precipitation in Yanji City had obvious interdecadal and interannual variability in the past 56 years, it may still be a dry period in the short term but will increase after ten years;the precipitation in Yanji City contained 5 peri-odic variations, and the periodic variations were most pronounced and the energy was the strongest in the time scale of 25-30 years and 17-23 years;there were four relatively obvious periodic scale centers of precipitation variation,according to the time scale of 22 and 28 years, Yan-ji was still in a high water period in 2015 and would be transformed into a dry season in a few years.%以1960—2015年延吉市降雨量为基础,运用Morlet复小波分析方法对降雨序列的多时间尺度变化进行了研究.结果表明,近56年来延吉市降雨量存在着明显的年代际变化和年际变化,短期内可能仍处于降雨偏少期,十几年后降雨将会增加;延吉市降雨包含5个周期变化规律,在25~30和17~23年时间尺度的周期变化最为明显,能量最强;存在4个较为明显的降雨变化周期尺度中心,从22和28年时间尺度上来看,2015年延吉市仍处于丰水期,几年之后将转为枯水期.
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