SIMULATION OF SEASONAL AND INTERHEMISPHERIC VARIATIONS IN THE STRATOSPHERIC CIRCULATION.

An attempt is made to simulate the seasonal variation and the interhemispheric asymmetries in the stratospheric circulation. A global model of the joint stratosphere-troposphere system has been constructed in which the seasonal variations of sea surface temperature, ozone and solar radiation are taken into consideration. This study contains a detailed description of the seasonal variation of the thermal and dynamical structure of the model stratosphere. It identifies some of the successes and failures in simulating various features of the stratosphere. Furthermore, attempts are made to determine some of the important dynamical factors which control the seasonal variations and the interhemispheric asymmetries in the structure of the model stratosphere.