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Monsoon rainfall and the circulation in the Afro-Asian regions.

The July and August rainfalls and the circulation patterns in the African and Asian monsoon regions have been investigated for the period 1891-1974. The interrelationship of monsoon rainfall within this region was examined by correlation between various subregions. The study of the circulation patterns hasshown that there are four major cells in the Afro-Asian region(West Africa 20*W-25 0E, East Africa 25*E-65*E, India 65*E-90*E, East Asia 90*E-130*E) with different thermodynamic properties. The relationship between the East African indirect cell and the Indian direct cell was investigated through the study of the Tropical Easterly Jet. It was shown that the East African cell is driven by the TEJ. The East Asian cell which has its ascending branch in the monsoon trough is examined by correlation with the Southern Oscillation. This work has shown that when the oscillation is strong, the trough fluctuation is in phase with the oscillation but not in phase otherwise. The spatial domain of the center of action appears to contract when the oscillation is weak. Thesis Supervisor: Reginald E. Newell Professor of Meteorology IA.