El Niño and Coastal Hydro-Meteorological Extremes: Analyzing Regional Rainfall Anomalies in Peninsular India
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Meteorological analysis indicates that the current El Niño cycle may trigger localized, intense precipitation in Tamil Nadu due to anomalous pressure gradients between the Bay of Bengal and the Arabian Sea, diverging from broader national climate trends.
The current El Niño phenomenon is exhibiting a nuanced impact on the Indian subcontinent, particularly concerning the coastal regions of Tamil Nadu. While El Niño is traditionally associated with a suppressed monsoon across much of India, climate experts suggest that its interaction with local geography leads to a distinct climatic response in the southern peninsula during the post-monsoon period.
At the core of this differential impact is the interplay between sea surface temperatures (SSTs) and the pressure differential between the Bay of Bengal and the Arabian Sea. During the post-monsoon phase, warmer-than-average waters in the surrounding seas can invigorate atmospheric moisture convergence. When El Niño conditions modify large-scale circulation patterns, the resulting pressure gradient acts as a catalyst, steering moisture-laden winds directly toward the Tamil Nadu coast. This process can manifest as intense, localized, and potentially extreme rainfall events that defy national-level precipitation trends.
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