Preprints
https://doi.org/10.5194/egusphere-2022-250
https://doi.org/10.5194/egusphere-2022-250
 
09 May 2022
09 May 2022

Applying dynamical systems techniques to real ocean drifters

Irina I. Rypina1, Timothy Getscher2, Lawrence Pratt1, and Tamay Ozgokmen3 Irina I. Rypina et al.
  • 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.

Journal article(s) based on this preprint

07 Oct 2022
Applying dynamical systems techniques to real ocean drifters
Irina I. Rypina, Timothy Getscher, Lawrence J. Pratt, and Tamay Ozgokmen
Nonlin. Processes Geophys., 29, 345–361, https://doi.org/10.5194/npg-29-345-2022,https://doi.org/10.5194/npg-29-345-2022, 2022
Short summary

Irina I. Rypina et al.

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision
AR by Irina I. Rypina on behalf of the Authors (16 Aug 2022)  Author's response    Author's tracked changes    Manuscript
ED: Referee Nomination & Report Request started (23 Aug 2022) by Pierre Tandeo
RR by Anonymous Referee #2 (06 Sep 2022)
ED: Publish subject to technical corrections (16 Sep 2022) by Pierre Tandeo
AR by Irina I. Rypina on behalf of the Authors (16 Sep 2022)  Author's response    Manuscript

Journal article(s) based on this preprint

07 Oct 2022
Applying dynamical systems techniques to real ocean drifters
Irina I. Rypina, Timothy Getscher, Lawrence J. Pratt, and Tamay Ozgokmen
Nonlin. Processes Geophys., 29, 345–361, https://doi.org/10.5194/npg-29-345-2022,https://doi.org/10.5194/npg-29-345-2022, 2022
Short summary

Irina I. Rypina et al.

Irina I. Rypina et al.

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The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.

Short summary
This paper applies different Lagrangian methods to identify Lagrangian Coherent Structures based on trajectories of 135 ocean surface drifters from the massive drifter release in the Gulf of Mexico. To our knowledge, this is the first comprehensive comparison of the performance of several different dynamical systems techniques with applications to real ocean drifters.