The highly anticipated El Niño has finally arrived, and it is proving to be as impactful as expected. Earlier this year, climate experts had predicted the formation of an El Niño in the central Pacific region. Over time, numerous models started hinting at a potentially potent or “super” El Niño, although caution was advised due to the early stage of the phenomenon.
In its monthly update in June, the U.S. National Oceanic and Atmospheric Administration (NOAA) officially declared an El Niño advisory, confirming the emergence of warmer conditions in the specific area of the Pacific Ocean known as Niño 3.4. For an event to be classified as an El Niño, temperatures in that zone must surpass 0.5°C above the average. Presently, ocean temperatures are approaching nearly 2°C above average, marking a record high for this time of year.
Climate scientist Zeke Hausfather from Berkeley Earth noted that the region in question is currently exceeding 2°C above average, a threshold indicative of very strong or, colloquially, a “super” El Niño. This suggests that the conditions are already resembling those of a powerful El Niño, remarkable for this early in the season.
El Niño and La Niña are integral components of the broader El Niño Southern Oscillation (ENSO) cycle, occurring in the Pacific Ocean. La Niña typically brings cooler temperatures to the region, while El Niño leads to warmer conditions. Forecasts anticipate the El Niño to peak around October, although some models suggest a more probable peak in November or December.
The most robust El Niño in recent memory occurred in 2015-2016, with the ocean temperature anomaly reaching roughly 2.75°C. Nat Johnson, a meteorologist at NOAA, highlighted the swift transition from La Niña to El Niño this year, a change that typically takes longer. The rapid shift has raised questions about the underlying reasons for such a sudden and pronounced transformation.
Speculations about a potentially unprecedented El Niño with temperatures exceeding 4°C above average have gained traction. The forecasted peak of around 3.6°C by current models surpasses historical El Niño events, prompting discussions about the influence of climate change on such extreme occurrences.
Despite observed patterns of fewer neutral years in the Niño 3.4 region and increased oscillations between El Niños and La Niñas, the role of climate change in these phenomena remains uncertain. Experts are yet to reach a consensus on the impact of climate change on El Niño events.
One prominent concern raised by Hausfather is the potential impact on food security in tropical regions due to anticipated droughts. In Canada, the effects of El Niño are expected to manifest during winter, bringing milder temperatures but also drier conditions, raising concerns about heightened wildfire risks in Western Canada come spring.
Overall, experts emphasize the need to prepare for substantial impacts, emphasizing the serious implications of El Niño on agriculture, natural ecosystems, and oceanic environments.