Preprints
https://doi.org/10.22541/essoar.169833426.64842571/v1
https://doi.org/10.22541/essoar.169833426.64842571/v1
10 Jul 2024
 | 10 Jul 2024
Status: this preprint is open for discussion.

Assessing the Material Coherence of Mesoscale Eddies as described from In Situ Data

Yan Barabinot, Sabrina Speich, and Xavier Carton

Abstract. Mesoscale eddies are a ubiquitous feature of the global ocean. According to Lagrangian theory, these eddies often transport a distinct water mass within their cores, making them materially coherent. This study aims to determine if such a distinct water mass exists in eddy cores, thereby verifying their material coherence using in situ data, despite the lack of temporal continuity. We introduce the term "thermohaline coherence" to describe this approach. Identifying such a water mass would signal Lagrangian transport from the eddy formation region. We analyzed the water masses at the cores of various eddies sampled during eight research cruises, using high-resolution data (approximately 20 km horizontally and 10 m vertically). We revisited coherence definitions and checked data accuracy. Comparing the horizontal positions of these core anomalies with eddy surface signatures revealed that surface data alone are insufficient for characterizing the eddy material coherence. To calculate eddy volumes, we compare thermohaline anomalies with other criteria and we present two methods for extrapolating eddy volumes from a single hydrographic section. The results show that the outermost closed contour of the Brunt-Väisälä frequency anomaly at each depth provides a reliable approximation for the eddy boundary.

Yan Barabinot, Sabrina Speich, and Xavier Carton

Status: open (until 04 Sep 2024)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-2029', Anonymous Referee #1, 10 Jul 2024 reply
    • AC1: 'Reply on RC1', Yan Barabinot, 16 Jul 2024 reply
Yan Barabinot, Sabrina Speich, and Xavier Carton
Yan Barabinot, Sabrina Speich, and Xavier Carton

Viewed

Since the preprint corresponding to this journal article was posted outside of Copernicus Publications, the preprint-related metrics are limited to HTML views.

Total article views: 76 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
76 0 0 76 0 0
  • HTML: 76
  • PDF: 0
  • XML: 0
  • Total: 76
  • BibTeX: 0
  • EndNote: 0
Views and downloads (calculated since 10 Jul 2024)
Cumulative views and downloads (calculated since 10 Jul 2024)

Viewed (geographical distribution)

Since the preprint corresponding to this journal article was posted outside of Copernicus Publications, the preprint-related metrics are limited to HTML views.

Total article views: 73 (including HTML, PDF, and XML) Thereof 73 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 

Cited

Latest update: 24 Jul 2024
Download
Short summary
Mesoscale eddies are ubiquitous rotating currents in the ocean. Some eddies called "Materially Coherent" are able to transport a different water mass from the surrounding water. By analyzing 3D eddies structures sampled during oceanographic cruises, we found that eddies can be nonmaterially coherent accounting only for their surface properties, but materially coherent considering their properties at depth. Future studies cannot rely solely on satellite data to evaluate heat and salt transport.