Shaktimatha 369 Learning

 

🟦 Geography Optional – MAINS Level

Paper–I : Climatology

Page – 7 | Indian Monsoon

UPSC / UPPSC | Shaktimatha 369 Learning

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Q7. Explain the mechanism of the Indian monsoon. Examine the factors responsible for its variability.

Directive: Explain + Examine (High Analytical Demand)

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Introduction

The Indian monsoon is a complex seasonal wind system that governs the climate and economy of the Indian subcontinent. It is not a single phenomenon but a result of multiple interacting factors.

Main Body

1. Mechanism of Indian Monsoon

• Thermal contrast: Differential heating between land and sea
• ITCZ shift: Northward movement during summer
• Tibetan Plateau heating: Acts as elevated heat source
• Jet streams: Subtropical westerly jet withdrawal and TEJ formation
• Coriolis force: Deflection of trade winds into monsoon winds

2. Factors Responsible for Monsoon Variability

• ENSO: El Niño weakens monsoon, La Niña strengthens it
• Indian Ocean Dipole (IOD): Positive IOD can offset El Niño impact
• Snow cover: Extensive Himalayan snow delays monsoon onset
• Sea Surface Temperature: Controls moisture supply
• Climate change: Increased frequency of extreme rainfall events

3. Regional & Temporal Variability

• Spatial unevenness of rainfall
• Break monsoon phases
• Delayed onset or early withdrawal

Conclusion

The Indian monsoon is a dynamic system influenced by global and regional factors. Understanding its variability is crucial for agriculture, water security and disaster preparedness in India.

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Diagrams to draw in exam:
• Summer monsoon wind pattern
• ITCZ shift
• Jet stream positions

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Examiner’s View:
✔ Mechanism + variability balanced
✔ Current relevance adds value
✔ Diagrams are essential for 15+ marks
✔ Over-explaining basics must be avoided

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End of MAINS – Page 7
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