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American Focus > Blog > Tech and Science > Record marine heatwaves may signal a permanent shift in the oceans
Tech and Science

Record marine heatwaves may signal a permanent shift in the oceans

Last updated: July 25, 2025 4:40 am
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Record marine heatwaves may signal a permanent shift in the oceans
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Record-breaking Marine Heatwaves Pose Grave Threat to Ocean Life

Hotter seas can lead to more intense storms, such as Hurricane Milton in 2024

NOAA

Scientists have raised alarm bells over the extreme marine heatwaves recorded since 2023, signaling a potential regime shift in the world’s oceans that could have catastrophic consequences for life on Earth.

The unprecedented marine heatwaves that occurred in the North Atlantic and Pacific oceans in 2023 were characterized by their severity, duration, and widespread impact, leading to record-breaking sea surface temperatures globally in 2023 and 2024. These events contributed to the consecutive declaration of the hottest years on record.

Matthew England from the University of New South Wales noted, “We’ve had progressive warming of our oceans over the last few decades, but 2023 marked a turning point with large-scale marine heatwaves affecting multiple regions simultaneously.”

Currently, the Mediterranean Sea is experiencing a marine heatwave with water temperatures soaring up to 5°C (9°F) above normal levels for this time of year, underscoring the ongoing impact of these heatwaves.

Researchers like Zhenzhong Zeng from the Southern University of Science and Technology in China have been studying the drivers behind these unprecedented marine heatwaves. Factors such as reduced cloud cover, weaker winds, and the emergence of a warming El Niño pattern in the Pacific Ocean have been identified as key influencers.

Zeng believes that the sustained high water temperatures indicate a shift to a “new normal” for the world’s oceans, with data suggesting an exponential accumulation of heat that defies traditional climate model predictions.

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This potential regime shift in the oceans poses a significant threat to marine life, with coral reefs facing collapse, mass die-offs, and migration of species. On land, the repercussions include heightened risks of droughts, heatwaves, wildfires, and storms due to accelerated heating.

While some experts like Neil Holbrook from the University of Tasmania urge caution in predicting a fundamental change in ocean dynamics based on limited data, the consensus is clear that unless urgent action is taken to curb greenhouse gas emissions, marine heatwaves will continue to intensify, posing a dire threat to marine ecosystems worldwide.

TAGGED:HeatwavesMarineOceansPermanentrecordshiftsignal
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