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Seasonal phasing of Agulhas Current transport tied to a baroclinic adjustment of near-field winds ArchiMer
Hutchinson, Katherine; Beal, Lisa M.; Penven, Pierrick; Ansorge, Isabelle; Hermes, Juliet.
The Agulhas Current plays a significant role in both local and global ocean circulation and climate regulation, yet the mechanisms that determine the seasonal cycle of the current remain unclear, with discrepancies between ocean models and observations. Observations from moorings across the current and a 22 year proxy of Agulhas Current volume transport reveal that the current is over 25% stronger in austral summer than in winter. We hypothesize that winds over the Southern Indian Ocean play a critical role in determining this seasonal phasing through barotropic and first baroclinic mode adjustments and communication to the western boundary via Rossby waves. Our hypothesis is explored using single layer and one‐and‐a‐half layer models. We find that the...
Tipo: Text Palavras-chave: Agulhas Current; Seasonal cycle; Wind stress curl; Rossby waves; Indian Ocean; Reduced gravity model.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00454/56607/58300.pdf
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