Applying dynamical systems techniques to real ocean drifters
- 1Woods Hole Oceanographic Institution, 266 Woods Hole rd., Woods Hole, MA 02540
- 2US Navy
- 3Rosenstiel School of Marine and Atmospheric Science, U. of Miami, 4600 Rickenbacker Causeway, Miami, FL 33149
- 1Woods Hole Oceanographic Institution, 266 Woods Hole rd., Woods Hole, MA 02540
- 2US Navy
- 3Rosenstiel School of Marine and Atmospheric Science, U. of Miami, 4600 Rickenbacker Causeway, Miami, FL 33149
Abstract. This paper presents the first comprehensive comparison of several different dynamical-systems-based measures of stirring and Lagrangian coherence, computed from real ocean drifters. Seven commonly used methods (finite-time Lyapunov exponent, trajectory path length, trajectory correlation dimension, trajectory encounter volume, Lagrangian-averaged vorticity deviation, dilation, and spectral clustering) were applied to 135 surface drifters in the Gulf of Mexico in order to map out the dominant Lagrangian coherent structures. Among the detected structures were regions of hyperbolic nature resembling stable manifolds from classical examples, divergent and convergent zones, and groups of drifters that moved more coherently and stayed closer together than the rest of the drifters. Many methods highlighted the same structures, but there were differences too. Overall, 5 out of 7 methods provided useful information about the geometry of transport within the domain spanned by the drifters.
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Irina I. Rypina et al.
Status: open (until 04 Jul 2022)
Irina I. Rypina et al.
Irina I. Rypina et al.
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