The timing of the report can also be notable. International ocean temperatures are usually highest in March and April, after the southern hemisphere summer season. This report was reached in August.
It additionally exceeded the earlier highest August worth, recorded in 2023 at 20.98°C. The report follows a collection of month-to-month sea floor temperature data and near-records by means of 2026, pointing to persistent heat throughout a lot of the worldwide ocean.
A robust El Niño is creating within the tropical Pacific, including heat to an ocean that has already been heating over many a long time due to human-driven local weather change.
In keeping with the World Meteorological Group, El Niño is anticipated to strengthen within the coming months, whereas Copernicus’s seasonal forecasting system suggests the occasion may attain ranges not seen for a number of a long time.
“This report is one other clear sign of an ocean below rising stress. El Niño is including warmth to the system, however it’s doing so on prime of a long time of human-driven warming,” mentioned Samantha Burgess, strategic lead for local weather on the European Centre for Medium-Vary Climate Forecasts.
She mentioned dangers to marine ecosystems and coastal communities rise with ocean temperatures, and that the variety of marine heatwave days globally has greater than tripled because the early Nineties.
On August 22, 1979, the identical ocean space averaged 20.15°C — almost a full diploma cooler than this yr’s studying on the identical date, reveals the ERA5 dataset.
Hotter oceans contribute to sea-level rise by means of thermal enlargement, enhance the chance and depth of marine heatwaves that injury coral reefs and seagrass meadows, and switch extra warmth and moisture to the environment, doubtlessly intensifying rainfall and a few storms.
As oceans heat, they’ll additionally develop into much less environment friendly at absorbing carbon dioxide, weakening one of many planet’s most essential pure buffers in opposition to local weather change.
