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Título: | Breaking of Internal Waves and Turbulent Dissipation in an Anticyclonic Mode Water Eddy |
Autor: | Fernández-Castro, Bieito CSIC ORCID; Ebans, D. Gwyn; Frajka-Williams, Eleanor; Vic, C.; Naveira-Garabato, Alberto | Palabras clave: | Eddies Internal waves Mesoscale processes Turbulence |
Fecha de publicación: | 2020 | Editor: | American Meteorological Society | Citación: | Journal of Physical Oceanography 50(7): 1893–1914 (2020) | Resumen: | A 4-month glider mission was analyzed to assess turbulent dissipation in an anticyclonic eddy at the western boundary of the subtropical North Atlantic. The eddy (radius ≈ 60 km) had a core of low potential vorticity between 100 and 450 m, with maximum radial velocities of 0.5 m s−1 and Rossby number ≈ −0.1. Turbulent dissipation was inferred from vertical water velocities derived from the glider flight model. Dissipation was suppressed in the eddy core (ε ≈ 5 × 10−10 W kg−1) and enhanced below it (>10−9 W kg−1). Elevated dissipation was coincident with quasiperiodic structures in the vertical velocity and pressure perturbations, suggesting internal waves as the drivers of dissipation. A heuristic ray-tracing approximation was used to investigate the wave–eddy interactions leading to turbulent dissipation. Ray-tracing simulations were consistent with two types of wave–eddy interactions that may induce dissipation: the trapping of near-inertial wave energy by the eddy’s relative vorticity, or the entry of an internal tide (generated at the nearby continental slope) to a critical layer in the eddy shear. The latter scenario suggests that the intense mesoscale field characterizing the western boundaries of ocean basins might act as a “leaky wall” controlling the propagation of internal tides into the basin’s interior | Descripción: | 22 pages, 13 figures.-- This article is licensed under a Creative Commons Attribution 4.0 license | Versión del editor: | https://doi.org/10.1175/JPO-D-19-0168.1 | URI: | http://hdl.handle.net/10261/217297 | DOI: | 10.1175/JPO-D-19-0168.1 | ISSN: | 0022-3670 | E-ISSN: | 1520-0485 |
Aparece en las colecciones: | (IIM) Artículos |
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