Geography • Indian GeographyHard
Consider the following statements regarding the hydro-meteorological features of the Indian summer monsoon: 1. The northward shift of the monsoon trough during the summer months lowers surface pressure across the Indo-Gangetic plains, drawing moisture-laden south-westerly winds from the Indian Ocean. 2. The onset of the monsoon is marked by a sudden and sustained increase in rainfall over the southern peninsula, known as the burst of the monsoon, triggered by the establishment of the Tropical Easterly Jet stream aloft. Which of the statements given above is/are correct?
A. 1 only
B. 2 only
C. Both 1 and 2✓ Correct Answer
D. Neither 1 nor 2
💡 Solution & Explanation
Both statements are correct. The seasonal migration of the Intertropical Convergence Zone, referred to in the South Asian context as the monsoon trough, creates a thermal low over northern India that pulls in maritime air masses. The sudden onset along the Malabar coast is reinforced by upper-air circulation dynamics involving the Tibetan Plateau heating and the Tropical Easterly Jet stream. Breaks in the monsoon occur when the trough shifts to the Himalayan foothills.
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