Geography • World GeographyMedium
Consider the global planetary wind dynamics that govern the onset of the Southwest Monsoon over Kerala: Statement I: The northward migration of the Intertropical Convergence Zone (ITCZ) during boreal summer establishes a low-pressure trough over the Indian subcontinent, drawing in southeast trade winds that cross the equator and deflect into southwest monsoon winds due to the Coriolis force. Statement II: The formation of an upper-tropospheric high-pressure anticyclone over the Tibetan Plateau creates a thermal engine that drives the upper-level easterly jet stream, which couples with lower-level convergence to intensify monsoonal rainfall in Kerala. Which of the following is correct?
A. Both Statement I and Statement II are correct✓ Correct Answer
B. Statement I is correct and Statement II is incorrect
C. Statement I is incorrect and Statement II is correct
D. Both Statement I and Statement II are correct, and Statement II is the direct driving mechanism of Statement I
💡 Solution & Explanation
Both statements are correct and describe complementary components of the South Asian monsoon machinery. The seasonal shift of the ITCZ and the cross-equatorial deflection of trade winds establish the lower-level monsoonal inflow, while the Tibetan Plateau heating creates upper-level divergence via the easterly jet stream that sustains intense vertical convection. This complex ocean-atmosphere interaction brings the first rains of the southwest monsoon to the Kerala coast around the first week of June.
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