Explain how a hyperactive Intertropical Convergence Zone (ITCZ) can generate prolonged rainfall events in Southeast Asia. Assess the implications of shifting ITCZ behaviour for India’s monsoon system.
Kartavya Desk Staff
Topic: Important Geophysical phenomena such as earthquakes, Tsunami, Volcanic activity, cyclone etc.,
Topic: Important Geophysical phenomena such as earthquakes, Tsunami, Volcanic activity, cyclone etc.,
Q2. Explain how a hyperactive Intertropical Convergence Zone (ITCZ) can generate prolonged rainfall events in Southeast Asia. Assess the implications of shifting ITCZ behaviour for India’s monsoon system. (15 M)
Difficulty Level: Medium
Reference: DTE
Why the question Recent WWA 2025 analysis showed that a hyperactive ITCZ intensified rainfall during Southeast Asian cyclones, making it crucial to understand its role and implications for India’s monsoon system. Key demand of the question Explain the physical mechanisms through which an intensified ITCZ produces prolonged rainfall in Southeast Asia and assess how shifts in ITCZ behaviour reshape India’s monsoon onset, spatial rainfall patterns and seasonal variability. Structure of the Answer: Introduction Introduce the ITCZ as the core equatorial convection belt whose variability strongly influences rainfall regimes across the tropics, including India. Body How a hyperactive ITCZ generates prolonged rainfall – Indicate mechanisms such as stronger convection, higher moisture availability, equatorial wave activity or slower system movement. Implications for India’s monsoon system – Suggest points on altered monsoon onset, spatial distribution, extreme rainfall intensity, cyclone–monsoon linkages and moisture transport effects. Conclusion Highlight that ITCZ variability is becoming more influential under global warming and stress the need to improve observation networks and modelling capacities.
Why the question Recent WWA 2025 analysis showed that a hyperactive ITCZ intensified rainfall during Southeast Asian cyclones, making it crucial to understand its role and implications for India’s monsoon system.
Key demand of the question Explain the physical mechanisms through which an intensified ITCZ produces prolonged rainfall in Southeast Asia and assess how shifts in ITCZ behaviour reshape India’s monsoon onset, spatial rainfall patterns and seasonal variability.
Structure of the Answer:
Introduction Introduce the ITCZ as the core equatorial convection belt whose variability strongly influences rainfall regimes across the tropics, including India.
• How a hyperactive ITCZ generates prolonged rainfall – Indicate mechanisms such as stronger convection, higher moisture availability, equatorial wave activity or slower system movement.
• Implications for India’s monsoon system – Suggest points on altered monsoon onset, spatial distribution, extreme rainfall intensity, cyclone–monsoon linkages and moisture transport effects.
Conclusion Highlight that ITCZ variability is becoming more influential under global warming and stress the need to improve observation networks and modelling capacities.