Coherent Lagrangian swirls among submesoscale motions

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Abstract

The emergence of coherent Lagrangian swirls (CLSs) among submesoscale motions in the ocean is illustrated. This is done by applying recent nonlinear dynamics tools for Lagrangian coherence detection on a surface flow realization produced by a data-assimilative submesoscale-permitting ocean general circulation model simulation of the Gulf of Mexico. Both mesoscale and submesoscale CLSs are extracted. These extractions prove the relevance of coherent Lagrangian eddies detected in satellite-altimetry–based geostrophic flow data for the arguably more realistic ageostrophic multiscale flow.

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Beron-Vera, F. J., Hadjighasem, A., Xia, Q., Olascoaga, M. J., & Haller, G. (2019). Coherent Lagrangian swirls among submesoscale motions. Proceedings of the National Academy of Sciences of the United States of America, 116(37), 18251–18256. https://doi.org/10.1073/pnas.1701392115

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