El Niño Begins: Climate Change Amplifies Extreme Weather and Global Impacts

Podcast overview

In this episode from World, The Universe And Us, hosts Dr Penny Sashay and Dr Owen Hooper discuss the start of El Niño, the possibility of a Super El Niño, and what warming climates could mean for its reach and severity. Researchers Emily Black and Alec Loon from the University of Reading explain the science behind El Niño, its teleconnections, and the uncertainties involved in predictions.

Key insights

• El Niño basics and what a Super El Niño could entail
• Climate change as an amplifier of impacts rather than a new phenomenon
• Global and regional effects including Europe, Africa, South Asia and the Americas
• Economic and food-security implications of El Niño driven extremes

El Niño onset and what it means for the world

The episode opens with an explanation that global weather agencies have declared El Niño has begun and models indicate a significant chance of a Super El Niño. The scientists note that El Niño is a natural pattern but its impacts are likely to be amplified by global warming. The discussion includes the idea that climate change can intensify the effects of the phenomenon even if the event itself is not dramatically more frequent.

Defining Super El Niño and the uncertainties

Experts clarify that terms like Super El Niño or Godzilla El Niño are not formal scientific terms and that there is no single formal threshold. A commonly cited indicator is sustained warming of the Pacific Ocean above a given level, roughly translating to higher-than-average air and sea-surface temperatures during strong events. The panel emphasizes that strong El Niños are rarer but more impactful, and the precise strength depends on multiple background atmospheric conditions.

How climate change modifies the impacts

The conversation delves into how a warmer world can intensify rainfall, heat, and moisture in the atmosphere, thereby increasing the severity of events associated with El Niño. The meteorologists explain that warmer air can hold more water, leading to heavier downpours in some regions and hotter heat waves in others. They also discuss how background warming raises baseline risks for crops and infrastructure, making the consequences of El Niño more damaging economically.

From the Pacific to the UK and beyond: teleconnections

The podcast explains teleconnections, where Pacific-driven circulation patterns propagate through the atmosphere to affect distant regions like Europe. In the UK and Western Europe, El Niño can influence the jet stream and the North Atlantic Oscillation, potentially yielding wetter autumns with storms or, in some configurations, colder, drier late winters. The panel notes that the exact sequence of effects is uncertain and can depend on other Atlantic climate phases at the time.

Global impacts and food security

The experts outline clear globally observed patterns, such as wetter conditions in parts of the southern United States, and hotter drier conditions across South Asia and parts of Africa that threaten crops like coffee, cacao, and rice. This volatility can influence commodity prices and threaten regional food security. They caution that while El Niño itself is a natural phenomenon, its consequences are amplified in a warming climate.

Adaptation and policy implications

Policy relevance comes through as the scientists advocate for preparedness and early action protocols for farmers and those vulnerable to climate variability. The importance of sharing weather information and developing decision-support tools for different regions is emphasized, along with the value of planning for variability in advance rather than reacting after events unfold.

What to watch next

The episode ends with guidance on monitoring forecasts and potential transitions to neutral or opposite phases like La Niña, and discusses how soil moisture persistence may influence longer-term agricultural impacts across growing seasons.