Explain the physical mechanism of Sudden Stratospheric Warming. Analyse its role in polar vortex disruption. Assess how post-SSW circulation changes influence winter extremes in South Asia.
Kartavya Desk Staff
Topic: Salient features of world’s physical geography
Topic: Salient features of world’s physical geography
Q2. Explain the physical mechanism of Sudden Stratospheric Warming. Analyse its role in polar vortex disruption. Assess how post-SSW circulation changes influence winter extremes in South Asia. (15 M)
Difficulty Level: Difficult
Reference: NW
Why the question Recent winter anomalies across Eurasia and severe cold waves in North India were directly linked to sudden stratospheric warming and polar vortex breakdown reported by WMO–IMD (2023–24). Key demand of the question Explain how sudden stratospheric warming occurs physically, how it disrupts the polar vortex structure, and how those altered circulation dynamics produce extended cold extremes over South Asia. Structure of the answer Introduction Define sudden stratospheric warming and highlight its significance as a winter teleconnection mechanism altering planetary circulation. Body Physical mechanism: Briefly mention planetary wave forcing and rapid stratospheric temperature reversal. Polar vortex disruption: Note vortex split or displacement and change in jet stream geometry. South Asia impact: Link to cold surges, enhanced western disturbances, and prolonged cold-wave days. Conclusion Indicate rising role of stratosphere-aware forecasting in winter risk preparedness and energy-planning.
Why the question
Recent winter anomalies across Eurasia and severe cold waves in North India were directly linked to sudden stratospheric warming and polar vortex breakdown reported by WMO–IMD (2023–24).
Key demand of the question
Explain how sudden stratospheric warming occurs physically, how it disrupts the polar vortex structure, and how those altered circulation dynamics produce extended cold extremes over South Asia.
Structure of the answer
Introduction Define sudden stratospheric warming and highlight its significance as a winter teleconnection mechanism altering planetary circulation.
• Physical mechanism: Briefly mention planetary wave forcing and rapid stratospheric temperature reversal.
• Polar vortex disruption: Note vortex split or displacement and change in jet stream geometry.
• South Asia impact: Link to cold surges, enhanced western disturbances, and prolonged cold-wave days.
Conclusion Indicate rising role of stratosphere-aware forecasting in winter risk preparedness and energy-planning.