In terms of global climatic classification, what major global wind and pressure belt migration primarily drives the annual onset of the Southwest Monsoon (Edavappathy) over Kerala?

💡 Solution & Explanation

The annual onset of the Southwest Monsoon over Kerala is driven by the northward seasonal migration of the Intertropical Convergence Zone toward the Tibetan Plateau, which creates an intense thermal low-pressure trough over the Indian subcontinent. Distractor options propose erroneous permanent pressure cells or winter circulation patterns unrelated to summer monsoon mechanics. This low-pressure system draws trade winds across the equator where Coriolis force deflects them into southwest winds. Theburst of the monsoon over the southern tip of the peninsula marks the formal commencement of the rainy season in India.