Ocean Science
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Articles | Volume 21, issue 5
Articles | Volume 21, issue 5
https://doi.org/10.5194/os-21-1933-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-21-1933-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 21, issue 5
OS Letters
 | Highlight paper
 | 
04 Sep 2025
OS Letters | Highlight paper |  | 04 Sep 2025

Synoptic observation of a full mesoscale eddy lifetime and its secondary instabilities in the Gulf of Mexico

Charly de Marez

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Cited articles

AVISO/DUACS: SWOT Level-3 SSH Basic (v2.0.1) [Data set], AVISO/DUACS [data set], https://doi.org/10.24400/527896/A01-2023.017, 2023a. a
AVISO/DUACS: SWOT Level-3 SSH Unsmoothed (v2.0.1) [Data set], AVISO/DUACS [data set], https://doi.org/10.24400/527896/A01-2024.003, 2023b.  a
Biggs, D. C.: Nutrients, plankton, and productivity in a warm-core ring in the western Gulf of Mexico, J. Geophys. Res.-Oceans, 97, 2143–2154, 1992. a
Brannigan, L., Marshall, D. P., Naveira Garabato, A. C., Nurser, A. G., and Kaiser, J.: Submesoscale instabilities in mesoscale eddies, J. Phys. Oceanogr., 47, 3061–3085, 2017. a
Callies, J. and Wu, W.: Some Expectations for Submesoscale Sea Surface Height Variance Spectra, J. Phys. Oceanogr., 49, 2271–2289, 2019. a
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Editorial statement
The authors present the first synoptic characterisation of an oceanic mesoscale eddy’s full life cycle using groundbreaking SWOT satellite altimetry. This unprecedented view challenges the long-standing perception of eddies as simple, elliptical structures, revealing the crucial role of mesoscale interactions in their evolution. The SWOT results capture intense submesoscale turbulence at the eddy’s rim, exposing secondary instabilities that likely drive its dissipation. These findings not only validate decades of vortex theory but also open new frontiers in our understanding of oceanic turbulence.
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Short summary
Oceanic eddies are giant swirling currents that help transport heat, nutrients, and pollutants across the ocean. However, their life cycle has never been observed in detail. Using new satellite data, we tracked an intense eddy in the Gulf of Mexico, describing its life cycle from birth during a 6-month period. Our observations reveal small-scale turbulence surrounding it and interactions with other structures that shape its evolution, validating decades of numerical studies.
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