Scientific synthesis reports and assessments
Scientific synthesis reports and assessments
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Articles | Volume 6-osr9
Articles | Volume 6-osr9
https://doi.org/10.5194/sp-6-osr9-11-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Report:
9th edition of the Copernicus Ocean State Report (OSR9)
https://doi.org/10.5194/sp-6-osr9-11-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 6-osr9
30 Sep 2025
 | OSR9 | Chapter 4.1
 | 30 Sep 2025 | OSR9 | Chapter 4.1

The 2023 marine heatwave in the North Atlantic tropical ocean

Amélie Loubet, Simon J. van Gennip, Romain Bourdallé-Badie, and Marie Drevillon

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Short summary
Marine heatwaves (MHWs) are intensifying due to climate change. In 2023, the Copernicus Marine forecast system tracked a significant MHW event in the North Atlantic tropical ocean. We show this event was unprecedented, at the surface and at depth. It peaked in the north-east in May, spreading south-west to reach the Caribbean by autumn. In the east and centre parts, the MHW remained within the surface layers, while in the Caribbean, it reached deeper levels due to warm waters advected by equatorial eddies.
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9th edition of the Copernicus Ocean State Report (OSR9)
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