关于西风急流在强迫扰动中作用的数值试验

本文利用非线性水波方程谱模式模拟了不同基本气流对低纬和中纬地区涡源扰动的强迫响应，进而讨论西风急流在大尺度流场强迫扰动中的作用。试验分析表明，中纬度西风急流对来自低纬的扰动波列有增哟的阻 阻滞的作用，并能影响强迫扰动的波数和路径。在存在西风急流的情况下，基本气流对低纬扰源的响应比对中纬扰源的响应要强得多。

A NUMERICAL EXPERIMENT OF THE ROLE OF WESTERLY JET IN FORCED DISTURBANCE

By using a global spectral model with nonlinear barotropic primitive equations, the forced responses of different initial basic flows on vortex sources in the low-latitudes and in the middle-latitudes are simulated. The role of the westerly jet in forced disturbance in largescale flow field is discussed. It shows that the westerly jet intensifies and blockes the wave of disturbance from low-latitudes, and changes the number of forced waves. The responses of basic flow to the disturbance source in low-latitudes are much more intensive than that in middle-latitudes when the westerly jet exists.