Global ocean temperatures reach record high as El Niño intensifies

The European Union’s Copernicus Climate Change Service has issued an alert that the world’s oceans are experiencing “unprecedented strain” as a combination of a strong El Niño event and ongoing climate‑change‑driven warming pushes sea‑surface temperatures to record levels. Satellite observations and in‑situ measurements compiled by Copernicus show global ocean temperatures rising faster than in any comparable period of the past several decades, with several regions already registering marine heatwaves that exceed historical norms. The agency attributes the surge to the simultaneous impact of the current El Niño, which typically raises temperatures in the Pacific and adjacent basins, and the long‑term upward trend caused by greenhouse‑gas emissions.

The elevated temperatures are expected to intensify stress on marine ecosystems, including increased coral bleaching, shifts in fish distribution, and heightened risk of hypoxic zones that can affect commercial fisheries and biodiversity. Copernicus emphasizes that continued monitoring and rapid mitigation efforts are essential to limit further oceanic degradation and to safeguard the services the oceans provide to global food security and climate regulation.