Author(s): Jacopo Busatto; Federico Falcini; Claudia Adduce; Guglielmo Lacorata
Linked Author(s): Claudia Adduce, Jacopo Busatto
Keywords: No Keywords
Abstract: This study employs Lagrangian simulations to explore the dynamics of the Agulhas Current region, focusing on mesoscale eddies known as Agulhas Rings. A crucial innovation is the introduction of a rotation index derived from velocity and acceleration vectors, which helps in the identification of trajectories within rotating structures. Trajectory analysis over the Atlantic section reveals distinct outcomes, with trajectories exhibiting stable, high rotation indices indicative of Agulhas Rings and others more linear behaviors. Statistical analysis shows positive rotation indices in trajectories leading to Agulhas Leakage, aligning with the anticyclonic nature of Agulhas Rings. Trajectories with rotation indices consistently above 0.8 resemble stable loops, referring to Agulhas Rings. Further exploration into the temporal aspects of tracer presence within coherent structures is suggested for enhanced predictive capabilities. While the strength of Lagrangian approaches has been solidly assessed, the methodology here presented contributes with valuable insights into Agulhas Current dynamics, highlighting the rotation index's role in predicting trajectory outcomes and distinguishing between anticyclonic and cyclonic structures.
Year: 2024