From our collaborating partner Living on Earth, public radio’s environmental news magazine, an interview by Jenni Doering with author Kevin Trenberth.
El Niño Phenomenon: A Deep Dive into the 2026 Event and Its Global Implications
The world is closely observing the unfolding El Niño phenomenon, a climatic event characterized by extraordinary warming of the central and eastern tropical Pacific Ocean. As the National Oceanic and Atmospheric Administration (NOAA) confirms the onset of an El Niño for 2026, scientists warn of a potential “super” El Niño with over 50% likelihood, which could significantly disrupt global weather and ocean patterns.
Renowned scientist Kevin Trenberth, affiliated with the University of Auckland and the National Center for Atmospheric Research, sheds light on the intricacies of El Niño. Trenberth explains, “An El Niño refers to an exceptional warming of the central and eastern tropical Pacific Ocean.” This warming disrupts the normal trade winds and circulates warm water from the Western Pacific to the east, altering atmospheric conditions as it progresses.
El Niño’s most pronounced effects occur towards the end of the year, with global temperature shifts peaking around February of the following year, potentially making February 2027 a critical month for global climate observations.
Defining a “Super” El Niño
The classification of an El Niño as “super” hinges on temperature indices. Trenberth clarifies, “If it gets to be above 2 degrees Celsius over this extensive area above the overall average, then we call it a very strong El Niño.” Such strong events have historically been rare, with only about three recorded instances.
Understanding the dynamics of the current El Niño event is crucial. Trenberth states that it can drastically alter tropical storm distributions and hurricane risks. For instance, Southern California and the southern U.S. might experience increased storm activity, while northern U.S. regions could witness reduced storm frequency.
Global Impact and Regional Concerns
El Niño’s effects are profound in the Global South. The Southeast Asian monsoon could weaken, impacting agriculture that relies heavily on seasonal rains. In Africa, El Niño influences can manifest as droughts or floods, affecting food security and health through disease outbreaks.
Trenberth emphasizes the unpredictable nature of each El Niño event, stating, “These things tend to occur, let’s say, once every four years, or every two to seven years. That means during the El Niño, which tends to last overall for about a year, the weather patterns are quite different than most of the time.”
Preparation and adaptation are key. By leveraging forecasts from NOAA and the World Meteorological Organization, regions can mitigate adverse impacts and potentially benefit from altered conditions.
Monitoring Challenges and Climate Change
The ability to monitor El Niño events relies heavily on NOAA’s network of moored buoys in the tropical Pacific, which face challenges such as maintenance during global disruptions like pandemics.
Amidst the ongoing climate crisis, the El Niño of 2026 is expected to push global temperatures to unprecedented highs. Trenberth remarks, “The global temperature is certainly going to be the highest on record from about now through next June.”
As greenhouse gas emissions continue to rise, Trenberth stresses the importance of reducing fossil fuel reliance and increasing renewable energy use. This year’s El Niño serves as a reminder of the intertwined nature of climate phenomena and human activity.
Ultimately, Trenberth advises, “The El Niño is here. It’s potentially getting to be strong, and it’s going to have big consequences for weather all around the globe.”
Original Story at insideclimatenews.org