Geography • World GeographyHard
How does the El Nino Southern Oscillation (ENSO) cycle in the equatorial Pacific Ocean globally teleconnect with regional precipitation anomalies during the southwest monsoon season in Kerala?
A. El Nino warm phases induce anomalous subsidence over the Indian Ocean and weaken the tropical Walker circulation, frequently resulting in suppressed rainfall and drought conditions in Kerala✓ Correct Answer
B. El Nino phases intensify lower-level convergence and cause massive flood events by strengthening moisture transport from the Atlantic basin
C. La Nina cold phases suppress all monsoon activity by establishing a permanent high-pressure anticyclone over the Arabian Sea
D. ENSO cycles have no statistically significant impact on peninsular Indian monsoons because regional topography completely insulates the Western Ghats
💡 Solution & Explanation
El Nino events involve abnormal warming of surface waters in the central and eastern tropical Pacific, shifting atmospheric Walker circulation and creating sinking air motion (subsidence) over the Indian Ocean. This suppresses cloud formation and weakens monsoon winds, often leading to below-average rainfall and agricultural drought across peninsular India, including Kerala. La Nina phases generally enhance monsoon rainfall. Understanding this Pacific-Indian Ocean teleconnection is critical for agricultural planning and drought mitigation in southern states.
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