Biogeosciences
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Articles | Volume 23, issue 12
Articles | Volume 23, issue 12
https://doi.org/10.5194/bg-23-4037-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-23-4037-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 23, issue 12
Research article
 | 
22 Jun 2026
Research article |  | 22 Jun 2026

Revealing hidden oxygen variability in the North Pacific: a two-decade analysis using GOBAI-O2

Miho Ishizu and Tomomichi Ogata

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Latest update: 06 Nov 2026
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Short summary
We used GOBAI (Gridded Ocean Biogeochemistry from Artificial Intelligence)-O₂ (Version 4.4), a new machine-learning-based dataset derived from Argo floats and shipboard observations, to examine 20-year linear trends in potential temperature, salinity, and dissolved oxygen in the North Pacific. Our results agree with prior studies and newly reveal spatially heterogeneous oxygen trends, including local increases. These are linked to physical processes such as the southward retreat of the oxygen minimum layer and a northward-shifting circulation front.
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