Breaking of Internal Waves and Turbulent Dissipation in an Anticyclonic Mode Water Eddy
A four-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 100–450 m, with maximum radial velocities of 0.5 m s−1 and Rossby number...
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American Meteorological Society
2020
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Online Access: | https://doi.org/10.1175/JPO-D-19-0168.1 https://archimer.ifremer.fr/doc/00615/72734/71841.pdf https://archimer.ifremer.fr/doc/00615/72734/88217.pdf https://archimer.ifremer.fr/doc/00615/72734/ |
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fttriple:oai:gotriple.eu:10670/1.g7cbdi 2023-05-15T17:33:54+02:00 Breaking of Internal Waves and Turbulent Dissipation in an Anticyclonic Mode Water Eddy Fernández-castro, Bieito Evans, Dafydd Gwyn Frajka-williams, Eleanor Vic, Clement Naveira-garabato, Alberto C. 2020-01-01 https://doi.org/10.1175/JPO-D-19-0168.1 https://archimer.ifremer.fr/doc/00615/72734/71841.pdf https://archimer.ifremer.fr/doc/00615/72734/88217.pdf https://archimer.ifremer.fr/doc/00615/72734/ en eng American Meteorological Society doi:10.1175/JPO-D-19-0168.1 10670/1.g7cbdi https://archimer.ifremer.fr/doc/00615/72734/71841.pdf https://archimer.ifremer.fr/doc/00615/72734/88217.pdf https://archimer.ifremer.fr/doc/00615/72734/ Archimer, archive institutionnelle de l'Ifremer Journal Of Physical Oceanography (0022-3670) (American Meteorological Society), 2020-07 , Vol. 50 , N. 7 , P. 1893-1914 envir geo Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ 2020 fttriple https://doi.org/10.1175/JPO-D-19-0168.1 2023-01-22T17:02:23Z A four-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 100–450 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 quasi-periodic 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 basins’ interior. Text North Atlantic Unknown Journal of Physical Oceanography 50 7 1893 1914 |
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envir geo Fernández-castro, Bieito Evans, Dafydd Gwyn Frajka-williams, Eleanor Vic, Clement Naveira-garabato, Alberto C. Breaking of Internal Waves and Turbulent Dissipation in an Anticyclonic Mode Water Eddy |
topic_facet |
envir geo |
description |
A four-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 100–450 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 quasi-periodic 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 basins’ interior. |
format |
Text |
author |
Fernández-castro, Bieito Evans, Dafydd Gwyn Frajka-williams, Eleanor Vic, Clement Naveira-garabato, Alberto C. |
author_facet |
Fernández-castro, Bieito Evans, Dafydd Gwyn Frajka-williams, Eleanor Vic, Clement Naveira-garabato, Alberto C. |
author_sort |
Fernández-castro, Bieito |
title |
Breaking of Internal Waves and Turbulent Dissipation in an Anticyclonic Mode Water Eddy |
title_short |
Breaking of Internal Waves and Turbulent Dissipation in an Anticyclonic Mode Water Eddy |
title_full |
Breaking of Internal Waves and Turbulent Dissipation in an Anticyclonic Mode Water Eddy |
title_fullStr |
Breaking of Internal Waves and Turbulent Dissipation in an Anticyclonic Mode Water Eddy |
title_full_unstemmed |
Breaking of Internal Waves and Turbulent Dissipation in an Anticyclonic Mode Water Eddy |
title_sort |
breaking of internal waves and turbulent dissipation in an anticyclonic mode water eddy |
publisher |
American Meteorological Society |
publishDate |
2020 |
url |
https://doi.org/10.1175/JPO-D-19-0168.1 https://archimer.ifremer.fr/doc/00615/72734/71841.pdf https://archimer.ifremer.fr/doc/00615/72734/88217.pdf https://archimer.ifremer.fr/doc/00615/72734/ |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Archimer, archive institutionnelle de l'Ifremer Journal Of Physical Oceanography (0022-3670) (American Meteorological Society), 2020-07 , Vol. 50 , N. 7 , P. 1893-1914 |
op_relation |
doi:10.1175/JPO-D-19-0168.1 10670/1.g7cbdi https://archimer.ifremer.fr/doc/00615/72734/71841.pdf https://archimer.ifremer.fr/doc/00615/72734/88217.pdf https://archimer.ifremer.fr/doc/00615/72734/ |
op_doi |
https://doi.org/10.1175/JPO-D-19-0168.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
50 |
container_issue |
7 |
container_start_page |
1893 |
op_container_end_page |
1914 |
_version_ |
1766132539552956416 |