Preprints
https://doi.org/10.5194/egusphere-2023-688
https://doi.org/10.5194/egusphere-2023-688
17 Apr 2023
 | 17 Apr 2023

Relative dispersion and kinematic properties of the coastal submesoscale circulation in the southeastern Ligurian Sea

Pierre-Marie Poulain, Luca Centurioni, Carlo Brandini, Stefano Taddei, Maristella Berta, and Milena Menna

Abstract. An array of Lagrangian instruments (more than 100 drifters and a profiling float) was deployed for several days in the coastal waters of the southeastern Ligurian Sea to characterize the near-surface circulation at the submesoscale (< 10 km). The drifters were trapped in an offshore-flowing filament and a cyclonic eddy that developed at the southwestern extremity of the filament. Drifter velocities are used to estimate differential kinematic properties (DKPs) and the relative dispersion of the near-surface currents on scales as small as 100 m. The maximum drifter speed is ~50 cm/s. The DKPs within the cluster exhibit considerable spatial and temporal variability, with absolute values reaching the order of magnitude of the local inertial frequency. Vorticity prevails in the core of the cyclonic eddy, while strain is dominant at the outer edge of the eddy. Significant convergence was also found in the southwestern flow of the filament. The initial relative dispersion on small scales (100–200 m) is directly related to some of the DKPs (e.g., divergence, strain and instantaneous rate of separation): The mean squared separation distance (MSSD) grows exponentially with time and the finite-size Lyapunov exponent (FSLE) is independent of scale. After 5–10 h of drift or for initial separations greater than 500 m, the MSSD and FSLE show smaller relative dispersion that decreases slightly with scale.

Journal article(s) based on this preprint

24 Nov 2023
Relative dispersion and kinematic properties of the coastal submesoscale circulation in the southeastern Ligurian Sea
Pierre-Marie Poulain, Luca Centurioni, Carlo Brandini, Stefano Taddei, Maristella Berta, and Milena Menna
Ocean Sci., 19, 1617–1631, https://doi.org/10.5194/os-19-1617-2023,https://doi.org/10.5194/os-19-1617-2023, 2023
Short summary

Pierre-Marie Poulain et al.

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on egusphere-2023-688', Roberto Iacono, 20 Apr 2023
    • AC1: 'Reply on CC1', Pierre-Marie Poulain, 20 Apr 2023
  • RC1: 'Comment on egusphere-2023-688', Anonymous Referee #1, 10 Jun 2023
    • AC2: 'Reply on RC1', Pierre-Marie Poulain, 31 Aug 2023
  • RC2: 'Comment on egusphere-2023-688', Anonymous Referee #2, 25 Jul 2023
    • AC3: 'Reply on RC2', Pierre-Marie Poulain, 31 Aug 2023

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on egusphere-2023-688', Roberto Iacono, 20 Apr 2023
    • AC1: 'Reply on CC1', Pierre-Marie Poulain, 20 Apr 2023
  • RC1: 'Comment on egusphere-2023-688', Anonymous Referee #1, 10 Jun 2023
    • AC2: 'Reply on RC1', Pierre-Marie Poulain, 31 Aug 2023
  • RC2: 'Comment on egusphere-2023-688', Anonymous Referee #2, 25 Jul 2023
    • AC3: 'Reply on RC2', Pierre-Marie Poulain, 31 Aug 2023

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
AR by Pierre-Marie Poulain on behalf of the Authors (05 Sep 2023)  Author's response   Author's tracked changes   Manuscript 
ED: Referee Nomination & Report Request started (06 Sep 2023) by Manuel Espino Infantes
RR by Anonymous Referee #2 (12 Oct 2023)
ED: Publish as is (12 Oct 2023) by Manuel Espino Infantes
AR by Pierre-Marie Poulain on behalf of the Authors (12 Oct 2023)

Journal article(s) based on this preprint

24 Nov 2023
Relative dispersion and kinematic properties of the coastal submesoscale circulation in the southeastern Ligurian Sea
Pierre-Marie Poulain, Luca Centurioni, Carlo Brandini, Stefano Taddei, Maristella Berta, and Milena Menna
Ocean Sci., 19, 1617–1631, https://doi.org/10.5194/os-19-1617-2023,https://doi.org/10.5194/os-19-1617-2023, 2023
Short summary

Pierre-Marie Poulain et al.

Pierre-Marie Poulain 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
Drifters and a profiling float were deployed in the coastal waters of the southeastern Ligurian Sea to characterize the near-surface circulation at scale of ~10 km. The drifters were trapped in an offshore-flowing filament and a cyclonic eddy that developed at the southwestern extremity of the filament. Drifter velocities are used to estimate differential kinematic properties and relative dispersion statistics of the surface currents.