Biogeosciences
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Articles | Volume 22, issue 23
Articles | Volume 22, issue 23
https://doi.org/10.5194/bg-22-7709-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-22-7709-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 22, issue 23
Research article
 | 
08 Dec 2025
Research article |  | 08 Dec 2025

Assessing the impact of riverine water on the Northwest Pacific using normalized Total Alkalinity

Tatsuki Tokoro, Shin-Ichiro Nakaoka, Shintaro Takao, Shu Saito, Daisuke Sasano, Kazutaka Enyo, Masao Ishii, Naohiro Kosugi, Tsuneo Ono, Kazuaki Tadokoro, and Yukihiro Nojiri

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Latest update: 30 Oct 2026
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Short summary
We studied how riverine water from the mainland of Japan affects the ocean's carbon cycle using decades of Total Alkalinity (TA) data from the Northwest Pacific. Statistical analysis revealed riverine water as a major TA source, reducing coastal acidification by 71 %, but with minimal impact on pH and atmospheric CO2 absorption. Future work aims to refine results with depth-specific data and apply findings to global models.
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