The El Niño and La Niña phenomena have a profound impact on global weather patterns, and India’s current colder-than-usual winter can be attributed to the longest-ever recorded La Niña episode.
What is El Niño and La Niña?
El Niño and La Niña arise from temperature variations in the Equatorial Pacific region, specifically in the east-central Equatorial Pacific.
These phenomena represent opposite phases of the El Niño-Southern Oscillation cycle, which describes temperature fluctuations between the ocean and atmosphere.
El Niño: The Warm Phase
Surface waters in the eastern tropical Pacific Ocean are abnormally warmed during an ‘El Nio’. Compared to La Nia, this “warm phase” of ENSO happens more frequently. El Nio episodes can have a substantial influence on global weather patterns and often last between nine and twelve months.
La Niña: The Cool Phase
La Niña signifies the unusual cooling of the tropical eastern Pacific, also known as the “cool phase” of ENSO. Unlike El Niño, La Niña events can endure from one to three years, leading to longer-term impacts on weather patterns.
Impacts of El Niño and La Niña
El Niño and La Niña events can cause significant changes in weather patterns worldwide, affecting various regions differently. Let’s explore some of the impacts associated with these phenomena:
1. Indian Monsoon and Extreme Weather
During La Niña events, India often encounters intense monsoon rains, which can have both positive and negative consequences. While these rains contribute to agricultural productivity, they can also lead to flooding and related challenges.
2. Drought and Flooding
La Niña can bring drought-like conditions to certain areas, such as Peru and Ecuador, while simultaneously causing heavy rainfall and flooding in other regions like Southeast Africa and Eastern Australia.
3. Winter Temperature Variations
La Niña can influence winter temperatures, with southern regions experiencing warmer winters compared to colder winters in the north.The Northwest United States and Western Canada, for example, often endure extremely cold winters during La Niña episodes.
4. Oceanic and Marine Life Changes
The cooling of Pacific Ocean waters during La Niña creates favourable conditions for marine life. Coldwater animals, such as squid and salmon, are attracted to areas like the California coast, impacting local ecosystems and fishing industries.
The Role of International Organizations
Several international organisations play a crucial role in monitoring and addressing climate phenomena like El Niño and La Niña. Let’s briefly highlight two prominent entities:
1. World Meteorological Organization
An international institution, the World Meteorological institution has 192 Member States and Territories, including India.
As the specialised agency of the United Nations for meteorology, operational hydrology, and related geophysical sciences, the WMO monitors and studies weather and climate phenomena worldwide.
2. The UN Framework Convention on Climate Change
The UNFCCC serves as the United Nations entity responsible for supporting global efforts in response to climate change.
Established in 1992, the UNFCCC aims to stabilise greenhouse gas concentrations to prevent dangerous human interference with the climate system.
Summary
The El Niño and La Niña phenomena are significant drivers of climate variability worldwide. The ongoing La Niña episode, the longest ever recorded, has contributed to India’s current colder winter.
Understanding and predicting the behaviour of El Niño and La Niña is crucial for governments, organisations, and communities to mitigate risks and adapt to changing climate conditions.
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