Watching the ocean before the heat arrives: Coordinated marine heatwave monitoring for the 2026-27 El Niño
Marine heatwaves are one of the most direct ways climate change affects ocean biodiversity. Past events have removed kelp forests and seagrass meadows, caused mass coral bleaching, and triggered harmful algal blooms and fisheries closures. Global sea surface temperatures reached a record high in August 2026, and the 2026–27 El Niño is forecast to be very strong, increasing the likelihood of marine heatwaves across multiple ocean basins.