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Despite the La Niña phenomenon, global ocean warming continued in 2025 due to rising concentrations of greenhouse gases, with ocean heat content reaching record levels, particularly in the Mediterranean.
Global ocean heat content in 2025 compared with previous years. Image from the International Cooperation Office of the Chinese Academy of Sciences.Even with a weak La Niña event, global ocean warming persisted in 2025 because of increased greenhouse gas concentrations. This reflects the long-term accumulation of heat within the climate system, according to scientists.
What is Ocean Heat Content (OHC) and why is it important?
Ocean Heat Content (OHC) is the total amount of thermal energy stored by the oceans, acting as the main reservoir for the excess heat generated by climate change.
The oceans absorb more than 90% of the heat trapped by greenhouse gases, playing a key role in regulating Earth’s climate.
OHC is a critical indicator of global warming, more reliable than surface temperature because water has a high capacity to store heat. A report published in Advances in Atmospheric Sciences revealed that the global ocean heat content
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