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