Articles | Volume 21, issue 4
https://doi.org/10.5194/os-21-1237-2025
https://doi.org/10.5194/os-21-1237-2025
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07 Jul 2025
Research article | Highlight paper |  | 07 Jul 2025

Local versus far-field control on South Pacific Subantarctic mode water variability

Ciara Pimm, Andrew J. S. Meijers, Dani C. Jones, and Richard G. Williams

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This paper highlights a new implementation of density co-ordinate functionality within an adjoint ocean model, the MITgcm ECCO adjoint. This is illustrated accordingly with a science application investigating the variability of Subantarctic Mode Water. The use of adjoints helps to trace causal links within the ocean, and the density-following feature is of particular interest for the ocean community with many possible further applications.
Short summary
Subantarctic mode water in the South Pacific Ocean is important due to its role in the uptake and transport of anthropogenic heat and carbon. The Subantarctic mode water region can be split into two pools using mixed-layer-depth properties. Sensitivity experiments are used to understand the effects of heating and wind on each pool. It is found that the optimal conditions to form large amounts of Subantarctic mode water in the South Pacific are local cooling and upstream warming combined.
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