Scientists say ocean surface temperatures have surged to new records, signaling that Earth’s climate system is pushing into unfamiliar conditions. Copernicus data indicated record-high sea surface temperatures globally in late June, breaking prior records set in recent years. Even small differences in ocean temperature can have outsized effects, including on marine life and the frequency and intensity of marine heatwaves.

Researchers note that part of the recent jump is tied to the developing El Niño pattern in the Pacific, which can shift heat into the atmosphere and raise global temperatures. But they emphasize that El Niño is acting on top of a longer-term warming trend driven by fossil-fuel emissions. Copernicus analysis also points to wider ocean warming beyond the tropics and indicates that recent heat levels may represent the start of a new phase.

Scientists warn that continued record warmth could further disrupt marine ecosystems, exacerbate impacts on fisheries, and contribute to extreme weather on land through extra energy and moisture feeding storms. They also stress that monitoring continues to determine whether these highs persist and how rapidly impacts could spread.