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Article

The Dynamical Structure of a Warm Core Ring as Inferred from Glider Observations and Along-Track Altimetry

1
Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA
2
Centro de Investigación Científica y de Educación Superior de Ensenada, Ensenada 22860, Mexico
3
Laboratoire d’Océanographie Physique et Spatiale, 29280 Plouzané, Brittany, France
4
Institute of Earth Sciences, University of Iceland, 102 Reykjavik, Iceland
*
Author to whom correspondence should be addressed.
Academic Editors: Yuri Cotroneo, Simon Ruiz and Pierre Testor
Remote Sens. 2021, 13(13), 2456; https://doi.org/10.3390/rs13132456
Received: 10 May 2021 / Revised: 9 June 2021 / Accepted: 21 June 2021 / Published: 23 June 2021
This study investigates the vertical structure of the dynamical properties of a warm-core ring in the Gulf of Mexico (Loop Current ring) using glider observations. We introduce a new method to correct the glider’s along-track coordinate, which is, in general, biased by the unsteady relative movements of the glider and the eddy, yielding large errors on horizontal derivatives. Here, we take advantage of the synopticity of satellite along-track altimetry to apply corrections on the glider’s position by matching in situ steric height with satellite-measured sea surface height. This relocation method allows recovering the eddy’s azimuthal symmetry, precisely estimating the rotation axis position, and computing reliable horizontal derivatives. It is shown to be particularly appropriate to compute the eddy’s cyclo-geostrophic velocity, relative vorticity, and shear strain, which are otherwise out of reach when using the glider’s raw traveled distance as a horizontal coordinate. The Ertel potential vorticity (PV) structure of the warm core ring is studied in details, and we show that the PV anomaly is entirely controlled by vortex stretching. Sign reversal of the PV gradient across the water column suggests that the ring might be baroclinically unstable. The PV gradient is also largely controlled by gradients of the vortex stretching term. We also show that the ring’s total energy partition is strongly skewed, with available potential energy being 3 times larger than kinetic energy. The possible impact of this energy partition on the Loop Current rings longevity is also discussed. View Full-Text
Keywords: gliders; altimetry; mesoscale; eddies; warm-core rings; potential vorticity; gulf of Mexico gliders; altimetry; mesoscale; eddies; warm-core rings; potential vorticity; gulf of Mexico
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MDPI and ACS Style

Meunier, T.; Pallás Sanz, E.; de Marez, C.; Pérez, J.; Tenreiro, M.; Ruiz Angulo, A.; Bower, A. The Dynamical Structure of a Warm Core Ring as Inferred from Glider Observations and Along-Track Altimetry. Remote Sens. 2021, 13, 2456. https://doi.org/10.3390/rs13132456

AMA Style

Meunier T, Pallás Sanz E, de Marez C, Pérez J, Tenreiro M, Ruiz Angulo A, Bower A. The Dynamical Structure of a Warm Core Ring as Inferred from Glider Observations and Along-Track Altimetry. Remote Sensing. 2021; 13(13):2456. https://doi.org/10.3390/rs13132456

Chicago/Turabian Style

Meunier, Thomas, Enric Pallás Sanz, Charly de Marez, Juan Pérez, Miguel Tenreiro, Angel Ruiz Angulo, and Amy Bower. 2021. "The Dynamical Structure of a Warm Core Ring as Inferred from Glider Observations and Along-Track Altimetry" Remote Sensing 13, no. 13: 2456. https://doi.org/10.3390/rs13132456

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