Resolution dependence of interlinked Southern Ocean biases in global coupled HadGEM3 models

Storkey, David; Mathiot, Pierre; Bell, Michael J.; Copsey, Dan; Guiavarc'h, Catherine; Hewitt, Helene T.; Ridley, Jeff; Roberts, Malcolm J.

doi:https://doi.org/10.5194/gmd-18-2725-2025

Articles | Volume 18, issue 9

https://doi.org/10.5194/gmd-18-2725-2025

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

https://doi.org/10.5194/gmd-18-2725-2025

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

Articles | Volume 18, issue 9

Model evaluation paper

|

16 May 2025

Model evaluation paper |

| 16 May 2025

Resolution dependence of interlinked Southern Ocean biases in global coupled HadGEM3 models

David Storkey, Pierre Mathiot, Michael J. Bell, Dan Copsey, Catherine Guiavarc'h, Helene T. Hewitt, Jeff Ridley, and Malcolm J. Roberts

Data sets

Data and scripts (1) for Storkey et al, "Resolution dependence of interlinked Southern Ocean biases in global coupled HadGEM3 models", GMD (2024) David Storkey https://doi.org/10.5281/zenodo.11102733

Data and scripts (2) for Storkey et al, "Resolution dependence of interlinked Southern Ocean biases in global coupled HadGEM3 models", GMD (2024) David Storkey https://doi.org/10.5281/zenodo.11102967

Model code and software

Ocean and sea ice model code for Storkey et al, "Resolution dependence of interlinked Southern Ocean biases in global coupled 605 HadGEM3 models", GMD (2024) David Storkey https://doi.org/10.5281/zenodo.11183860

Short summary

The Southern Ocean is a key region of the world ocean in the context of climate change studies. We show that the Met Office Hadley Centre coupled model with intermediate ocean resolution struggles to accurately simulate the Southern Ocean. Increasing the frictional drag that the seafloor exerts on ocean currents and introducing a representation of unresolved ocean eddies both appear to reduce the large-scale biases in this model.