基于PW-MK的辽阳季节性降水特性分析

Analysis of Seasonal Precipitation Characteristics in Liaoyang Based on PW-MK

以1955年~2018年为时段,采用PW-MK、线性倾向率、模比系数差积、小波分析等方法,研究辽阳地区4个季节降水特征。结果表明:春季降水量呈增大趋势,夏季、秋季呈显著减少趋势,夏季降水量下降速率较大,为-0.97mm/a,冬季降水总体较稳定;春季降水存在3组不同尺度的旱涝周期,夏季、秋季、冬季降水存在2组不同尺度的旱涝周期。辽阳地区1955年~2018年各季节降水趋势存在差异,不同尺度旱涝周期共同影响辽阳降水。

In the period from 1955 to 2018, PW-MK, linear tendency rate, difference product of modulus ratio, wavelet analysis and other methods were used to study the precipitation characteristics of four seasons in Liaoyang. The results show that the precipitation in spring shows an increasing trend, and there is a significant decrease in summer and autumn. The decreasing rate of summer precipitation is-0.97 mm/a, and the overall precipitation in winter is relatively stable. There are three groups of droughts and floods in spring There are two sets of drought and flood cycles with different scales in summer, autumn and winter precipitation. Liaoyang region has different precipitation trends from 1955 to 2018, and different scales of drought and flood cycles jointly affect precipitation in Liaoyang.