摘要
位势场中槽脊的分布、遥相关型的形态和准定常波的传播路径是1月份500hPa月平均高度场的重要特征。通过资料分析和数值试验,本文证明此三者之间是彼此关联的整体,它们与青藏高原和落基山的强迫作用有关。东亚大槽和北美大槽的强度在中高纬度上存在显著的负相关。这种负相关和槽前急流强度的年际变化导致北美和东亚存在相似的相关型分布,准定常波在两大地形下游传播的不同则导致两区域相关波链形态的明显差异。
The distribution of trough and ridge system, the configuration of teleconnec-tion, and the horizontal propagation of quasi-stationary waves are the main important characteristics of the January monthly mean 500 hPa height field. Upon data analyses and numerical experiments, it is shown that these three main characteristics are associated one another and closely related to the mechanical forcing of the Rocky Mountains and Tibetan Plateau. There exists prominent negative correlation in intensity variation between the American trough and Asian trough at high and middle latitudes. Such negative correlation, in conjunction with the annual variation of the intensity of the jets in front of the two troughs, leads to the existence of the similar teleconnection patterns in the North America and East Asia. On the other hand, the different propagation behaviors of quasi-stationary waves downstream of the two main mountains result in the fundamental difference in the distribution of correlation chains in the North America and East Asia.
出处
《气象学报》
CSCD
北大核心
1991年第2期129-140,共12页
Acta Meteorologica Sinica
