El Niño could become strongest since 1950: What it means for India
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Context
The has forecast an 81% chance of a 'very strong' El Niño developing between October and December, potentially ranking among the strongest since 1950. This intensifying El Niño, driven by anomalous warming in the of the Pacific Ocean, is expected to suppress the Indian monsoon and contribute to extreme weather globally. The has already noted deficient rainfall and forecasts continued below-normal precipitation, heightening concerns for agriculture and water security in India.
UPSC Perspectives
Geographical
To understand the impact of El Niño on the Indian monsoon, one must first grasp the mechanics of the . During normal conditions, strong trade winds push warm surface water towards the western Pacific (near Indonesia), causing upwelling of cold water off the coast of South America. This creates a low-pressure area and heavy rainfall in the western Pacific. However, during an El Niño event, these trade winds weaken, and warm water flows back eastwards towards South America. The article notes that weakened trade winds push warm water eastward, reinforcing the El Niño state through ocean-atmosphere feedbacks. This shifts the primary zone of convection and rainfall eastward, disrupting the (the atmospheric circulation over the tropical Pacific). For India, this disruption typically leads to a weaker monsoon, as the low-pressure system over the Indian subcontinent, essential for drawing in moisture-laden winds from the Indian Ocean, is compromised. UPSC frequently tests the mechanics of ENSO, the significance of the (a specific area in the central-eastern equatorial Pacific where sea surface temperatures are measured to define El Niño intensity), and the distinction between moderate, strong (>1.5°C anomaly), and very strong (>2°C anomaly) El Niño events.
Environmental
The current El Niño is developing against a backdrop of significant global warming, leading to a complex interplay of natural variability and human-induced climate change. A climate scientist noted that ocean dynamics increased subsurface temperatures, providing a heat reservoir that amplifies surface warming, particularly under the influence of background global ocean warming. This synergistic effect means that a strong El Niño can push global temperatures to record highs, as predicted for 2027. Furthermore, warmer oceans hold more moisture, leading to a paradox where El Niño years can see overall deficient rainfall but an increase in the frequency of extreme, localized, short-duration rainfall events. This increases the risk of flash floods and landslides even in a drought-prone year. Aspirants should link this to the broader topic of climate extremes and how natural oscillations like ENSO are becoming more unpredictable and intense due to the warming baseline of the planet, complicating climate forecasting and strategies.
Economic
A deficient monsoon, exacerbated by a strong El Niño, has profound implications for the Indian economy, which remains heavily dependent on agriculture. Approximately half of India's net sown area is rainfed, making the southwest monsoon critical for Kharif crop production (like rice, pulses, and oilseeds). The historical correlation is stark: 60% of El Niño years have resulted in below-normal or deficient seasonal rainfall in India. A weakened monsoon leads to lower agricultural output, which can trigger food inflation—a major concern for formulation by the . High food prices constrain the RBI's ability to lower interest rates to spur growth. Furthermore, deficient rainfall impacts reservoir levels, affecting hydropower generation and water availability for industrial use. The cascading effect on rural incomes depresses overall rural demand, slowing economic momentum. UPSC candidates must analyze these forward linkages: how a geographical phenomenon translates into macroeconomic challenges, affecting GDP growth, inflation targeting, and food security policies.