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Bloomberg

Scientists have recorded the highest temperature ever measured in the world’s oceans, as climate change combines with a powerful El Nino in the tropical Pacific.
The global average sea-surface temperature hit a record 21.1 degrees Celsius (70 Fahrenheit) on August 22, according to Europe’s Earth observation agency Copernicus, which has been tracking the metric daily since 1979. The previous single-day record of 21.09 degrees was measured in March 2024.
“El Nino is adding heat to the system, but it is doing so on top of decades of human-driven warming,” said Samantha Burgess, strategic lead for climate at Copernicus’ European Centre for Medium-Range Weather Forecasts.
“As ocean temperatures continue to rise, the risks to marine ecosystems and coastal communities also increase,” she said.




Higher ocean temperatures contribute to sea level rise and increase the chance of extreme weather events, as warmer water transfers more heat and moisture to the atmosphere, intensifying storms and heat on land. Warmer oceans also have a reduced capacity to absorb carbon dioxide.
Record temperatures have already been measured in isolated areas of the world’s oceans including the western Mediterranean Sea as well as at the Earth’s poles, driven mainly by man-made climate change. Copernicus expects the trend to continue, with ocean temperatures now being supercharged by El Nino.
The August record is particularly worrying because global ocean temperatures are typically highest in March and April, after the Austral summer, Copernicus said.
Adam Scaife, head of long-range forecasting at Britain’s national weather agency, told the BBC on Friday: “We are expecting the biggest El Nino for over a century, peaking at something over 3 degrees - that is unheard of in modern climate records”.
This means Pacific water would heat up more than 3 degrees above the norm in the coming months.
Additional reporting by Agence France-Presse


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Average surface waters reached 21.1 degrees Celsius, months ahead of when peak global ocean temperatures typically occur


Average surface waters reached 21.1 degrees Celsius, months ahead of when peak global ocean temperatures typically occur.


Climate change

Extreme weather

Weather

Hottest ocean temperature recorded as ‘super’ El Nino forms

.css-1c6uqr6{color:inherit;font-weight:inherit;font-size:inherit;font-family:inherit;line-height:inherit;overflow-wrap:break-word;}Average surface waters reached 21.1 degrees Celsius, months ahead of when peak global ocean temperatures typically occur

Average surface waters reached 21.1 degrees Celsius, months ahead of when peak global ocean temperatures typically occur