Is global warming changing the frequency and intensity of El Niño? Discuss with reference to recent observations.

El Niño is the warm phase of the El Niño–Southern Oscillation (ENSO). It is a natural ocean and atmosphere pattern that returns every 2–7 years [1]. The 2026–27 event has been record-breaking, and many ask whether global warming is now driving El Niño. The evidence suggests that warming raises the background and the stakes. It does not yet prove that El Niño itself has changed.

Recent observations suggesting a warming imprint

• Record heat in Niño 3.4: Sea temperature in the main ENSO index region went above 30°C for the first time on record. The anomaly reached +3.48°C on 18 October 2026 [1].
• Warmer oceans overall: The average temperature of the world's non-polar oceans hit a record 21.18°C in August 2026 [1].
• Strong agreement among forecasts: All 30 members of NOAA GFDL's model ensemble forecast a peak above 2°C. GFDL says such values usually occur only once every 1–2 decades [2].
• Unusually long and strong: NOAA CPC gives an 83% chance of a "historic" event, stronger than any since 1950, for Oct–Dec 2026 [3]. WMO puts the chance of El Niño lasting through February 2027 at nearly 100% [4].

Reasons for caution

• The measuring scale has shifted: The whole tropical ocean is warming, so the old index (ONI) struggles to track ENSO accurately. In 2026 NOAA CPC adopted the Relative Oceanic Niño Index (RONI), which measures Niño 3.4 against the tropical average [5]. On this view, part of the "record" is background warming, not a stronger El Niño.
• Frequency is not settled: Scientists find it hard to separate the effect of warming on El Niño from natural variation. Researchers use coral geochemistry to reconstruct how ENSO behaved in the past [1].
• Strength is not the same as impact: Experts say stronger events generally bring stronger impacts, but not in a fixed ratio [1]. One event cannot establish a trend.

Implications

• Warmer baselines raise the risk of heatwaves, altered rainfall and extreme weather into 2027 [1][4]. This matters for India's rabi crops and its northeast monsoon.

To sum up, recent observations clearly show El Niño now occurring over a warmer ocean, but a lasting rise in its frequency is not yet proven. The way forward is better ENSO monitoring with relative indices like RONI, more research on past climate, and using forecast lead time for heat-action and crop contingency plans. This supports SDG 13 (climate action).