Articles | Volume 6, issue 4
https://doi.org/10.5194/wcd-6-1179-2025
https://doi.org/10.5194/wcd-6-1179-2025
Research article
 | 
21 Oct 2025
Research article |  | 21 Oct 2025

Southern Annular Mode persistence and westerly jet: a reassessment using high-resolution global models

Ting-Chen Chen, Hugues Goosse, Cécile Davrinche, Stephy Libera, Christopher Roberts, Matthias Aengenheyster, Kristian Strommen, Malcolm Roberts, Rohit Ghosh, and Jin-Song von Storch

Model code and software

Data access to EERIE ESM output via intake catalogues: Phase1 plus Hackathon simulations Fabian Wachsmann et al. https://doi.org/10.5281/zenodo.14243677

SAM Persistence, Westerly Jet, and Eddy--Mean Flow Feedback Analysis (v1.0) Chen, T.-C. and Davrinche, C https://doi.org/10.5281/zenodo.17258010

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Short summary
Southern Annular Mode (SAM) is a leading mode of Southern Hemisphere climate variability, but global models often overestimate its persistence in summer. Bias in SAM persistence is reduced and jet latitude improved using high-resolution sea surface temperature (SST)-prescribed models, pointing to the central role of SSTs. Control experiments explore the influence of model resolution and mesoscale ocean features on SAM persistence, highlighting the complex and subtle nature of air-sea coupling.
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