夏季风作用下的纵向岭谷区夏季降水量 年际变化的时空特征和规律

应用三维数据的时间小波变换方法, 分析研究了夏季风作用下的纵向岭谷区夏季降水量 在年际变化上的时空特征和规律。结论为: 夏季风作用下的云南纵向岭谷区夏季降水量在年际变 化上的特征时间尺度分别约为2 年、7 年和16 年; 2 年、7 年和16 年特征时间尺度的较大振幅能 量活动区分别与纵向岭谷区的山脉走向一致或正交; 与2 年特征时间尺度相对应的较大振幅能 量活动中心纬度的夏季降水量表现出了明显的东西向波动的时间演变特征, 而与7 年和16 年特 征时间尺度相对应的较大振幅能量活动中心纬度的夏季降水量则分别表现出了一种向西和向东 移动的时间演变趋势; 与2 年特征时间尺度相对应的较大振幅能量活动中心经度的夏季降水量 也表现出了明显的南北向波动的时间演变特征, 而与7 年和16 年特征时间尺度相对应的较大振 幅能量活动中心经度的夏季降水量则分别表现出了一种明显向北和向南移动的时间演变趋势。

Tempor al- Spatial Featur es and Law of Summer Pr ecipitation Inter annual Var iability Over the Longitudinal Range- Gorge Region under Effect of the Summer Monsoon

Using the temporal wavelet transform method for three-dimensional data,the temporal-spatial features and law of summer precipitation interannual variability over the Longitudinal Range-Gorge Region(LRGR) under effect of the summer monsoon are investigated.The results show that there are 2-year,7-year and 16-year characteristic timescales for the summer precipitation interannual variability over the LRGR under the effect of the summer monsoon.The larger amplitude energy regions corresponding to the 2-year,7-year and 16-year characteristic timescales are consistent with or normal to the mountain ranges of LRGR respectively.The summer precipitation longitudinal evolutions of the larger central latitude in association with the 2-year characteristic timescale show obviously longitudinal oscillations.But the summer precipitation longitudinal evolutions of the larger central latitudes in association with the 7-year and 16-year characteristic timescales have obviously the tendency to move towards the west and the east respectively.The summer precipitation latitudinal evolutions of the larger central longitude in association with the 2-year characteristic timescale also show obviously latitudinal oscillations.But the summer precipitation latitudinal evolutions of the larger central longitudes in association with the 7-year and 16-year characteristic timescales have obviously the tendency to move towards the north and the south respectively.