The European climate monitoring agency Copernicus announced Monday that the world’s oceans reached their hottest recorded surface temperature of 21.1 °C (70 °F) over the weekend. The spike, driven by a strong El Niño event and ongoing human‑caused climate change, threatens marine ecosystems and the industries that depend on them.
Scientists warn of cascading effects
Copernicus strategic climate lead Samantha Burgess said the record temperature underscores the strain on the climate system and the ocean’s capacity to absorb heat. Ocean warming reduces oxygen levels and increases acidity, which can harm seafood production and alter ocean currents that influence weather patterns.
Former NOAA chief Jane Lubchenco called the record “very troubling,” noting that a warmer ocean can destabilize weather, threaten food security and damage marine life. Burgess added that warmer seas amplify heat‑wave impacts by limiting the cooling effect of sea breezes.
El Niño’s role and future outlook
Typically, the warmest sea‑surface temperatures occur in March‑April, but this year the record was set in August, indicating an unusually early and intense El Niño. The phenomenon is expected to peak between November and January, further raising ocean temperatures.
Long‑term warming from the combustion of coal, oil and gas has already added about 0.8 °C (1.4 °F) to global ocean heat. Researchers such as biology professor Boris Worm and marine ecologist John Bruno warn that continued warming could lead to fisheries collapse, especially for the Peruvian anchovy fishery, which is already vulnerable during El Niño events.
Implications for fisheries and coastal communities
Anchovies, a key food source for larger fish, marine mammals and seabirds, cannot migrate to cooler waters and may fail to reproduce, threatening the entire food web. The ripple effect could reach consumers and coastal economies that rely on these fisheries.
Warmer waters also favor opportunistic species like jellyfish, which have been observed more frequently off Europe and could become more common along the U.S. East Coast.
Broader concerns
Former NOAA administrator Rick Spinrad described the ocean as the planet’s thermostat, emphasizing that a healthy ocean is essential for safety, prosperity and well‑being. The unprecedented temperature record suggests that future challenges for food security, economic stability and environmental health may intensify.
Original reporting: Alexandria, VA News – WTOP News — read the source article.
