Context: The United States’ National Oceanic and Atmospheric Administration (NOAA) confirmed the formation of a new El Niño in the equatorial Pacific, placing the odds at 63% that it will intensify into a very strong or super El Niño by the northern winter.
About The Super El Niño:
What It Is?
- An El Niño represents the periodic, anomalous warming of sea-surface temperatures (SSTs) across the central and eastern equatorial Pacific Ocean. While the India Meteorological Department (IMD) classifies a standard El Niño based on temperature departures from the long-term average, a very strong or super El Niño is explicitly defined by a massive temperature departure exceeding 2°C in a specific reference patch of the Pacific.
How It Forms?
- Slackening of Trade Winds: The equatorial trade winds that normally blow strongly from east to west—pushing warm surface waters toward Asia—begin to stall or reverse direction.
- West-to-East Warm Water Drift: Due to weakened winds, massive pools of warm surface water accumulate and move eastward toward the coast of South America.
- The Feedback Loop: As the eastern Pacific heats up, it further disrupts atmospheric pressure zones, slackening the trade winds even more. This loop locks the system into a self-reinforcing cycle that drives temperatures past the critical 2°C threshold.
- The Climate Change Multiplier: Long-term climate change acts as an incubator, increasing the baseline heat available in the oceans and making modern super El Niños significantly more intense than historical ones.
Key Technical Features:
- The S-Curve Calendar Lifecycle: The phenomenon follows a strict seasonal timeline—emerging during the spring, reaching its peak intensity during the winter months, and rapidly collapsing by the following spring season.
- Delayed Suppression Signals: Because the ocean warming peaks late in the year, its suppressing effect on global weather systems is felt primarily during the middle and later stages of summer monsoon cycles rather than at their onset.
- Rarity of Scale: True super events are historically rare. Since the start of standard instrument tracking in 1950, only four major years have crossed this extreme threshold: 1972-73, 1982-83, 1997-98, and 2015-16.
- Cyclonic Redistribution: The phenomenon does not generate more total cyclones globally; instead, it shifts where they form. Strong wind shear suppresses Atlantic hurricanes while creating highly favorable conditions for super typhoons in the Central and Eastern Pacific.
Implications on India and the Globe:
Impact on India:
- Suppression of the South Asian Monsoon: El Niño often weakens the Indian monsoon, causing below-normal rainfall and increasing drought risks across many regions.
- Highly Erratic Rainfall Distribution: It can delay monsoon onset and create long dry spells, severely affecting crop growth and agricultural productivity.
- The Indian Ocean Dipole (IOD) Variable: A positive IOD may partly offset El Niño’s effects, but current forecasts suggest limited relief from monsoon weakening.
Global Impacts:
- Severe Ecological Destruction: Super El Niño events trigger forest fires, coral bleaching, and ecosystem degradation across several tropical regions.
- Extreme Transnational Droughts: Many countries experience severe droughts, water shortages, crop failures, and heightened food security concerns.
- Breaching Global Temperature Thresholds: El Niño releases additional ocean heat into the atmosphere, pushing global temperatures to record levels and potentially above the 1.5°C threshold.
