Strong El Niño to emerge in Pacific Ocean after July, says NOAA
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Context
The US-based has predicted the emergence of a 'very strong' El Niño in the Pacific Ocean later this year, potentially lasting until the end of 2026. This transition from ENSO-neutral conditions raises significant concerns for India's upcoming summer monsoon, agricultural output, and domestic inflation targets. Historically, El Niño has been linked to severe droughts, though its impacts can sometimes be counterbalanced by regional ocean phenomena.
UPSC Perspectives
Geographical
The El Niño-Southern Oscillation (ENSO) is a recurring climate pattern involving changes in the temperature of waters in the central and eastern tropical Pacific Ocean. El Niño (the warm phase) occurs when sea surface temperatures in the Niño 3.4 region rise 0.5°C or more above average, which weakens the trade winds and alters global atmospheric circulation. For UPSC Prelims, it is crucial to understand that El Niño generally suppresses the , leading to deficient rainfall over the Indian subcontinent. However, the exact impact is modulated by the (IOD), a similar temperature oscillation in the Indian Ocean. A positive phase of the IOD—characterized by warmer waters in the western Indian Ocean compared to the east—can enhance monsoon winds and offset El Niño's drying effects, as witnessed in years like 1997 and 2023.
Economic
The delivers over 70% of India's annual rainfall, directly dictating the sowing and yield of rainfed such as rice, cotton, sugarcane, and soybeans. An El Niño-induced drought can severely depress agricultural output, leading to acute supply-side constraints in the food market. This dynamic directly threatens the inflation targeting mandate of the , as food inflation accounts for a significant weightage in the Consumer Price Index (CPI). When food prices surge due to low crop yields, the central bank may be forced to maintain a hawkish stance (keeping interest rates high to suppress demand and control inflation). Such tight monetary policy, combined with depressed rural incomes from poor agricultural yields, can result in a broader slowdown in national economic growth.
Environmental
Beyond India, El Niño acts as a massive global climate disruptor tracked by international meteorological agencies like the . It fundamentally alters atmospheric circulation, typically leading to extreme heat and prolonged droughts in regions like Southeast Asia and Australia, while simultaneously causing excessive rainfall and flooding in parts of the Americas. In the context of anthropogenic (human-caused) climate change, a 'very strong' El Niño exacerbates baseline temperature rises, often pushing global average surface temperatures to record-breaking highs. This compounded warming accelerates severe ecological phenomena, including widespread coral bleaching events, intensified forest fires, and rapid glacial melt. For UPSC Mains, candidates must analyze how natural climatic cycles like ENSO are becoming increasingly unpredictable and severe when superimposed on underlying global warming trends.