Oxygen minimum zones in the Indian Ocean and their response to changes in the Indian Ocean meridional circulation

Oboh, Eugene Odion; Lahajnar, Niko; Gaye, Birgit; Shrikumar, Avanti; Rixen, Tim

doi:10.5194/bg-23-5759-2026

Articles | Volume 23, issue 16

https://doi.org/10.5194/bg-23-5759-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/bg-23-5759-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 23, issue 16

Research article

|

21 Aug 2026

Research article |

| 21 Aug 2026

Oxygen minimum zones in the Indian Ocean and their response to changes in the Indian Ocean meridional circulation

Eugene Odion Oboh, Niko Lahajnar, Birgit Gaye, Avanti Shrikumar, and Tim Rixen

Supplement

https://doi.org/10.5194/bg-23-5759-2026-supplement

Data sets

Oxygen minimum zones in the Indian Ocean and their response to changes in the Indian Ocean meridional circulation E. Oboh https://doi.org/10.5281/zenodo.21210975

Model code and software

Oxygen minimum zones in the Indian Ocean and their response to changes in the Indian Ocean meridional circulation E. Oboh https://doi.org/10.5281/zenodo.21210975

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Short summary

The Arabian Sea and Bay of Bengal have low-oxygen zones which are harmful to marine life. The Arabian Sea low-oxygen zone expanded until 2013 but has since shrunk. We found more oxygen-rich water flowing in from the southern Indian Ocean, while local oxygen-poor water sources declined. However, higher oxygen consumption partly offsets this oxygen gain. Both shifts are tied to changes in Indian Ocean circulation and the time water spend in the region, likely related to global climate change.