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Breaking of Internal Waves and Turbulent Dissipation in an Anticyclonic Mode Water Eddy.
- Source :
-
Journal of Physical Oceanography . Jul2020, Vol. 50 Issue 7, p1893-1914. 22p. - Publication Year :
- 2020
-
Abstract
- 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 0.5ms-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 X 10-10W kg-1) and enhanced below it (>10-9W kg-1). Elevated dissipation was coincident with quasiperiodic structures in the vertical velocity and pressure perturbations, suggesting internal waves as the drivers of dissipation. Aheuristic 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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00223670
- Volume :
- 50
- Issue :
- 7
- Database :
- Academic Search Index
- Journal :
- Journal of Physical Oceanography
- Publication Type :
- Academic Journal
- Accession number :
- 145424589
- Full Text :
- https://doi.org/10.1175/JPO-D-19-0168.1