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  1. El Niño–Southern Oscillation - Wikipedia

    El Niño–Southern Oscillation (ENSO) is a global climate phenomenon that emerges from variation in winds and sea surface temperatures over the tropical Pacific Ocean. Those variations have an …

  2. El Niño & La Niña (El Niño-Southern Oscillation) - NOAA Climate.gov

    Apr 10, 2025 · El Niño and La Niña are the warm and cool phases of a natural climate pattern across the tropical Pacific known as the El Niño-Southern Oscillation, or “ENSO” for short.

  3. What is ENSO? - National Weather Service

    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.

  4. El Niño and La Niña - National Oceanic and Atmospheric Administration

    Nov 18, 2025 · For more than 30 years, climate researchers have been puzzling about how human-forced climate change affects the El Niño Southern Oscillation (ENSO), the warm phase of which we …

  5. El Niño Southern Oscillation (ENSO)

    Nov 9, 2023 · El Niño Southern Oscillation (ENSO) is a naturally occurring large-scale climatic phenomenon involving fluctuating ocean temperatures in the central and eastern equatorial Pacific, …

  6. El Niño / La Niña - World Meteorological Organization

    Dec 4, 2025 · The El Niño-Southern Oscillation (ENSO) is a recurring natural phenomenon characterised by fluctuating ocean temperatures in the equatorial Pacific, coupled with changes in …

  7. Southern Oscillation | El Niño, La Niña & Climate Change | Britannica

    Southern Oscillation, in oceanography and climatology, a coherent interannual fluctuation of atmospheric pressure over the tropical Indo-Pacific region. The Southern Oscillation is the …

  8. MRCC - El Niño Southern Oscillation

    While El Niño events have been occurring for thousands of years, they were not studied in depth until the late 20th century. Sea surface temperature data is most often used to represent when the El Niño …

  9. El Niño-Southern Oscillation - Center for Science Education

    El Niño refers to changes in sea surface temperature and Southern Oscillation refers to air pressure changes in the atmosphere above the equatorial Pacific Ocean - together they are referred to as the …

  10. What is the El Niño–Southern Oscillation (ENSO) in a nutshell?

    May 5, 2014 · Sir Gilbert Walker discovered the “Southern Oscillation,” or large-scale changes in sea level pressure across Indonesia and the tropical Pacific. However, he did not recognize that it was …