5 June 2026

How a monster ocean heatwave could fuel a super El Niño

The Bulletin | Mariana Bernardi Bif, Franz Philip Tuchen

An over 80 percent chance of an El Niño event emerging by July 2026, coupled with a 9,000-mile marine heatwave forming in the North Pacific since late 2025, is raising scientific concerns about a potential "super" or "Godzilla" El Niño. These concurrent extreme warming events could prolong marine heatwaves, disrupt fisheries and ecosystems, and intensify global climate impacts into 2027.

Marine heatwaves, like the "Blob 1.0" (2013-2015) and "Blob 2.0" (2019-2020), have previously transformed North American marine ecosystems, causing harmful algal blooms and seabird mortality. Anthropogenic climate change is influencing El Niño frequency and intensity. The current North Pacific heatwave, larger than "Blob 1.0," may initiate El Niño conditions, which in turn could amplify the heatwave's duration. Such prolonged warming disrupts the ocean's biological carbon pump, reduces nutrient transport, and reorganizes food webs, leading to trophic mismatches and severe consequences for marine life and carbon absorption.

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