New observations confirm the progressive acidification in the Mozambique Channel

Metzl, Nicolas; Lo Monaco, Claire; Tribollet, Aline; Ternon, Jean-François; Chevallier, Frédéric; Gehlen, Marion

doi:10.5194/bg-22-7187-2025

Articles | Volume 22, issue 22

https://doi.org/10.5194/bg-22-7187-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/bg-22-7187-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 22, issue 22

Research article

|

25 Nov 2025

Research article |

| 25 Nov 2025

New observations confirm the progressive acidification in the Mozambique Channel

Nicolas Metzl, Claire Lo Monaco, Aline Tribollet, Jean-François Ternon, Frédéric Chevallier, and Marion Gehlen

Supplement

https://doi.org/10.5194/bg-22-7187-2025-supplement

Data sets

SOCAT D. C. E. Bakker et al. https://doi.org/10.25921/9wpn-th28

An updated synthesis of ocean total alkalinity and dissolved inorganic carbon measurements from 1993 to 2023: the SNAPO-CO2-v2 dataset N. Metzl et al. https://doi.org/10.17882/102337

A synthesis of ocean total alkalinity and dissolved inorganic carbon measurements from 1993 to 2022: the SNAPO-CO2-v1 dataset N. Metzl et al. https://doi.org/10.17882/95414

Surface ocean carbon fields Copernicus Marine Service https://doi.org/10.48670/moi-00047

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Short summary

In the Mozambique Channel, observed acceleration of the ocean acidification in the recent decades is mainly driven by anthropogenic CO₂ uptake. In this region the aragonite saturation state reached 3.2 in 2025 and could be as low as 3 in the next 10 years with potential impact on marine ecosystem including corals reefs areas.