NUMERICAL EXPERIMENTS OF THE ATMOSPHRIC CIRCULATION RESPONSES TO THE SEA SURFACE TEMPERATURES IN THE TROPICAL REGIONS

The responses of the atmospheric vertical circulations to the anomalies of the sea surface temperatures in the tropical regions are computed numerically with two-level primitive equation model in the tropical regions for two cases: (1) anomalous warming and (2) anomalous cooling. It is shown in our experiments that there is a opposite developing trend between the Walker circulation and Hadley circulation which was discovered by Chinese meteorologists. We have further developed the Bjerknes' hypothesis. It is indicated that the east-west gradient of the ocean temperature in the tropical regions may play a major role in the fomation of the two perpendicularvertical circulations.