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本文采用一种复经验正交函数分析方法和滤波技术,对1978—79年冬季全球冬季风实验资料系列FGGE-Ⅲb进行分析,尤其对东亚地区时间尺度10—20天的主要行星尺度环流分量进行分解,结果表明影响气压和厚度场的决定性因子是冷季风潮,受季风潮影响200百帕上无辐散风u_φ第一模态以1—2天滞后沿经向和纬向有类似于季风潮的传播;季风潮振动导致局地经向环流相应变化,以无旋风V_X第一模态表示的Hadley环流几乎无经向传播但有明显的纬向传播,并在传播过程中加强;热带对于副热带存在反馈并通过u_φ第二模态实现。在急流入口处u_X第二模态表示次级环流的存在,其水平尺度约20个纬距。
In this paper, we use a complex empirical orthogonal function analysis method and filtering technique to analyze the winter global winter monsoon data series FGGE-Ⅲb from 1978 to 1979, especially for the major planetary scale circulation components in East Asia with time scales of 10-20 days Decomposition, the results show that the pressure and thickness of the decisive factor is the cold monsoon wave, the impact of the monsoon wave 200 upa no divergence wind u_φ The first modal 1-2 days lag along the latitudinal and latitudinal similar to the quarter The monsoon tidal vibration causes the local meridional circulation to change correspondingly. The Hadley circulation represented by the first mode without cyclone V_X has almost no meridional but significant zonal propagation and is strengthened in the process of propagation. Subtropical existence of feedback and through u_φ second modal realization. The u_X second modality at the entrance to the jet represents the existence of a secondary circulation with a horizontal scale of about 20 latitudes.