dorsal/arxiv
View SchemaLagrangian transport through an ocean front in the North-Western Mediterranean Sea
| Authors | Ana M. Mancho, Emilio Hernandez-Garcia, Des Small, Stephen Wiggins, Vicente Fernandez |
|---|---|
| Categories | |
| ArXiv ID | physics/0608105 |
| URL | https://arxiv.org/abs/physics/0608105 |
| DOI | 10.1175/2007JPO3677.1 |
| Journal | Journal of Physical Oceanography 38, 1222-1237 (2008). |
Abstract
We analyze with the tools of lobe dynamics the velocity field from a numerical simulation of the surface circulation in the Northwestern Mediterranean Sea. We identify relevant hyperbolic trajectories and their manifolds, and show that the transport mechanism known as the `turnstile', previously identified in abstract dynamical systems and simplified model flows, is also at work in this complex and rather realistic ocean flow. In addition nonlinear dynamics techniques are shown to be powerful enough to identify the key geometric structures in this part of the Mediterranean. In particular the North Balearic Front, the westernmost part of the transition zone between saltier and fresher waters in the Western Mediterranean is interpreted in terms of the presence of a semipermanent ``Lagrangian barrier'' across which little transport occurs. Our construction also reveals the routes along which this transport happens. Topological changes in that picture, associated with the crossing by eddies and that may be interpreted as the breakdown of the front, are also observed during the simulation.
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"abstract": "We analyze with the tools of lobe dynamics the velocity field from a\nnumerical simulation of the surface circulation in the Northwestern\nMediterranean Sea. We identify relevant hyperbolic trajectories and their\nmanifolds, and show that the transport mechanism known as the `turnstile\u0027,\npreviously identified in abstract dynamical systems and simplified model flows,\nis also at work in this complex and rather realistic ocean flow. In addition\nnonlinear dynamics techniques are shown to be powerful enough to identify the\nkey geometric structures in this part of the Mediterranean. In particular the\nNorth Balearic Front, the westernmost part of the transition zone between\nsaltier and fresher waters in the Western Mediterranean is interpreted in terms\nof the presence of a semipermanent ``Lagrangian barrier\u0027\u0027 across which little\ntransport occurs. Our construction also reveals the routes along which this\ntransport happens. Topological changes in that picture, associated with the\ncrossing by eddies and that may be interpreted as the breakdown of the front,\nare also observed during the simulation.",
"arxiv_id": "physics/0608105",
"authors": [
"Ana M. Mancho",
"Emilio Hernandez-Garcia",
"Des Small",
"Stephen Wiggins",
"Vicente Fernandez"
],
"categories": [
"physics.ao-ph",
"nlin.CD",
"physics.flu-dyn"
],
"doi": "10.1175/2007JPO3677.1",
"journal_ref": "Journal of Physical Oceanography 38, 1222-1237 (2008).",
"title": "Lagrangian transport through an ocean front in the North-Western Mediterranean Sea",
"url": "https://arxiv.org/abs/physics/0608105"
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