El Niño–Southern Oscillation (ENSO) is a coupled ocean–atmosphere phenomenon centered in the tropical Pacific, characterized by quasi-periodic fluctuations between warm (El Niño), cold (La Niña), and neutral phases. It arises from interactions between equatorial Pacific sea surface temperature anomalies, changes in thermocline depth, and variations in trade winds and the Walker circulation. ENSO modulates global atmospheric circulation, influencing precipitation patterns, temperature anomalies, and extreme weather frequency worldwide. It is a primary source of interannual climate variability and is represented and predicted in climate models using indices such as Niño 3.4 and the Southern Oscillation Index, with substantial implications for seasonal forecasting and climate impact assessments.
In recent years, as extreme weather events have occurred with increasing frequency, scientists have been searching within the chaotic atmospheric system for clues that can enhance forecasting capabilities—factors such as ...
Earth Sciences
Nov 6, 2025
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La Niña, the cooler and at times costlier flip side of El Niño, has arrived to warp weather worldwide, meteorologists said Thursday. This natural weather phenomenon often turbocharges the Atlantic hurricane season, but this ...
Environment
Oct 9, 2025
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A new study has made a counterintuitive discovery about how El Niño affects India's summer monsoon. Instead of reducing rainfall overall and causing widespread droughts, the periodic climatic phenomenon increases rainfall ...
Australia's changing climate is shaking things up, literally. New research from the University of South Australia (UniSA) warns that increasingly intense La Niña weather cycles are posing fresh challenges for homeowners, ...
Environment
Sep 11, 2025
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El Niño-Southern Oscillation (ENSO) is the strongest interannual variability signal in Earth's climate system. The shifts between its warm and cold phases profoundly impact global extreme weather, ecosystems, and economic ...
Earth Sciences
Sep 4, 2025
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A recent study reveals how a major global climate pattern influences the African weather systems that help seed Atlantic hurricanes. The findings, published in the Journal of Climate, could lead to better seasonal forecasts ...
Earth Sciences
Sep 3, 2025
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Earth's climate is a dynamic system of interconnected physical processes and events occurring around the globe. Many of these processes are coupled so that changes in one event or process in one geographical area will result ...
Earth Sciences
Aug 19, 2025
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Insects are arguably the most important animals on the planet. Their variety is unparalleled in nature, and they carry out vital tasks such as pollinating plants and providing food for other animals.
Ecology
Aug 10, 2025
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The butterfly effect suggests that small changes in a system can have a large impact on eventual outcomes. One metaphor used to illustrate this concept is a butterfly flapping its wings only to cause a hurricane across the ...
Earth Sciences
May 28, 2025
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A Monash University-led study is prompting scientists to rethink how the El Niño-Southern Oscillation (ENSO) system evolved and how it might behave in the future as our climate continues to change.
Earth Sciences
May 26, 2025
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