低纬高原地区降水量资源年际变化的特征时间尺度及其时空演变

应用三维数据的时间小波变换方法，分析研究了低纬高原地区降水量资源在年际变化上的特征时间尺度及其时空演变。结论为：低纬度高原地区降水量资源在年际变化上的特征时间尺度分别约为2a、7a和15a。2a、78和158特征时间尺度的较大振幅能量活动区，分别主要位于滇西北到滇东南、滇东北到滇西南和滇中一带。与2a特征时间尺度相对应的较大振幅能量活动中心纬度的降水量，表现出了明显的东西向波动的时间演变特征，而与78和158特征时间尺度相对应的较大振幅能量活动中心纬度的降水量，则表现出了在东西向较为稳定少变的时间演变特征。与2a特征时间尺度相对应的较大振幅能量活动中心经度的降水量，也表现出了明显的南北向波动的时间演变特征，而与7a和15a特征时间尺度相对应的较大振幅能量活动中心经度的降水量，则表现出了一种明显向南移动的时间演变趋势。

Characteristic Timescales and Temporal-Spatial Changes of Precipitation Resource Interannual Variability over the Low Latitude Plateau Area

Based on the data of precipitation field in Yunnan and using the temporal wavelet transform method for the three-dimensional data , the characteristic timescales and temporal-spatial changes of precipitation resource interannual variability over the Low Latitude Plateau Area are investigated. The results show that there are 2-years, 7-years and 15-years characteristic timescales for the precipitation resource interannual variability over the Low Latitude Plateau Area. The larger amplitude energy regions corresponding to the 2-years, 7-years and 15-years characIeristic timesealesare main from northwest to southeast, northeast to southwest and central area of Yunnan respectively. The precipitation longitudinal evolutions of the larger central latitude in association with the 2-years characteristic timescale appear obviously longitudinal oscillations. But the precipitation longitudinal evolutionsof the larger central latitudes in association with the 7-years and 15-years characteristic timescales appear quasi-stationary and no moving. The precipitation latitudinal evolutionsof the larger central longitude in association with the 2-years characteristic timeseale also appear obviously latitudinal oscillations. But the precipitation latitudinal evolutions of the larger central longitudes in association with the 7-years and 15-years characteristic timeseales all have obviously the tendency to move towards the south.