Marine heat waves are cooking our ocean ecosystems—and will only become more common
You may have heard reports of fish die-offs or seen photos of hauntingly bleached coral.
Marine heat waves are intensifying and causing devastation to ocean ecosystems worldwide. These abnormal periods of unusually high ocean temperatures can last for weeks, leading to widespread coral bleaching, seagrass loss and fish die-offs. A marine heat wave occurs when ocean temperatures exceed 90% of historical records for at least five consecutive days.
While they can happen anywhere in the ocean, all marine ecosystems are at risk, as species like coral and kelp cannot relocate. Coastal communities that rely on fisheries, tourism and culturally significant marine sites can suffer economically and culturally due to these devastating events. For example, the 2011 Western Australian marine heat wave triggered widespread coral bleaching across the Pilbara, Ningaloo and Houtman Abrolhos Islands regions.
Recently, a prolonged marine heat wave in Western Australia in 2026 killed nearly half of the coral in the North West Shelf region. To better understand these events and minimize their impact, further research is needed on ocean currents, subsurface ocean conditions and climate patterns. Efforts should also focus on model prediction of future marine heat waves to enable early warning systems.
Most importantly, reducing greenhouse gas emissions is crucial to limit further ocean warming and protect ocean ecosystems from the worsening effects of climate change.
Written by urgent.news from Phys.org's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
