非均匀海面温度异常分布对沃克环流影响的数值试验

本文采用七层初始方程谱模式，模拟在特定的海温异常的、不均匀的分布下对低纬大气环流的影响。本文研究得到如下结果:1. 积分七层初始方程谱模式可模拟出一个低纬沃克环流。2. 东太平洋出现异常暖海温时，积分96小时后产生一个对沃克环流的扰动。3. 扰动在东西向呈现上升与下沉运动相间的波列，并具有明显的西传现象。4. 东太平洋出现异常偏冷海温时，模拟结果与暖海温时类似，但扰动环流的垂直运动符号与其相反。5. 当东太平洋海温为正态分布时，仍然可以得到上述结果。

A Numerical Simulation of the Impact of SST Anomalies on Low Latitude Circulations

In this paper, by using the 7–level PE–spectral model a simulation of SST anomalies and inhomogeneous distribution in the specific waters concerned has been made. Also the impact of those situations on lower latitude circulations has been discussed. The results are as followeings: A lower latitude Walker cell can be simulated by integrating 7–level PE–spectral model. When SST anomaly in the East Pacific is warm, a disturbance responsive to Walker circulation would occur after 96–hour’s integrating. The intensity of Walker circulation increases with the integrating time, a series of propagating wave westward with alternating between ascending and sinking could be identified. When SST anomaly in the East Pacific is cold, a disturbance and wave series have also been found. The sign of vertical motion of the disturbance is opposite to those of case in the warm SST. A reasonable result can also be obtained in normal (warm or cold) distribution of SST in the East Pacific