Super El Niño

Source:  TG

Subject:  Geography

Context: Experts warn of a potential Super El Niño later this year, which could push global temperatures to record heights in 2027 and trigger devastating weather extremes worldwide.

About Super El Niño:

What is El Niño?

• El Niño is the warm phase of the El Niño-Southern Oscillation (ENSO) cycle, characterized by the unusual warming of surface waters in the central and eastern tropical Pacific Ocean. It is a climate pattern that disrupts normal weather conditions, typically occurring every three to seven years.

How it is Formed?

Under normal conditions, trade winds blow from east to west along the equator, pushing warm surface water toward Asia and allowing cold, nutrient-rich water to rise (upwelling) near South America.

1. Weakening Winds: During El Niño, these trade winds soften or shift direction (becoming westerly wind bursts).
2. Heat Migration: Without strong winds to hold it back, warm water slides eastward toward the Americas in the form of a Kelvin wave.
3. Thermocline Shift: This warm pulse pushes down the thermocline (the boundary between warm surface water and cold depths), preventing cold water from reaching the surface.
4. Atmospheric Response: The warmer ocean surface heats the atmosphere above it, altering global jet streams and precipitation patterns.

About Super El Niño:

What is a Super El Niño?

• A Super El Niño is an exceptionally strong event defined by sea surface temperature anomalies in the Niño 3.4 region spiking by at least 2^OC (3.6^OF) above the long-term average. Only a few such events have occurred since 1950, with some models now predicting the strongest event in 140 years for the 2026–27 cycle.

Factors Affecting/Causing It:

• Subsurface Heat Buildup: A massive buildup of heat below the ocean surface is already feeding into seasonal forecasts, often a precursor to rapid surface intensification.
• Westerly Wind Bursts: Strong bursts of wind from the west act as fuel, racing more warm water eastward and preventing the system from neutralizing.
• Underlying Global Warming: The general rising trend in ocean temperatures makes modern El Niños appear stronger than historical ones, as the baseline temperature of the Pacific is already elevated.

Implications of a Super El Niño

Global Implications:

• Temperature Records: A strong event could make 2027 the hottest year on record, supercharging the effects of human-induced climate change.
• Jet Stream Alteration: The jet stream typically bends south over North America, bringing wetter conditions to the southern U.S. and milder, less stormy weather to the north.
• Hurricane Suppression: Stronger high-altitude winds in the Atlantic can shred young hurricanes, often leading to a quieter Atlantic hurricane season but a more vicious one in the Central Pacific.
• Regional Disasters: It historically unleashes deluges and flooding in Peru and the Middle East, while causing severe droughts in Ethiopia and Central Africa.

Impact on India:

• Monsoon Disruption: El Niño is strongly associated with deficient monsoon rainfall in India. A supercharged event could lead to widespread drought, impacting agriculture and rural livelihoods.
• Agricultural Stress: Reduced rainfall during the crucial Kharif season can lower crop yields for rice, pulses, and sugarcane, leading to food inflation.
• Heatwaves: It often correlates with more intense and prolonged heatwaves during the Indian summer, further straining the energy grid and public health.
• Economic Loss: According to the WMO, such shifts can cause millions of dollars in economic losses in climate-sensitive sectors like agriculture and water management.