Near-inertial energy propagation inside a Mediterranean anticyclonic Eddy - Archive ouverte HAL
Article Dans Une Revue Journal of Physical Oceanography Année : 2020

Near-inertial energy propagation inside a Mediterranean anticyclonic Eddy

Résumé

Motivated by observations of a strong near-inertial wave signal at the base of the semipermanent anticyclonic Cyprus Eddy during the 2010 Biogeochemistry from the Oligotrophic to the Ultraoligotrophic Mediterranean (BOUM) experiment, a numerical study is performed to investigate the role of near-inertial/eddy interactions in energy transfer out of the mixed layer. A hybrid temporal–spatial decomposition is used to split all variables into three independent components: slow (eddy) and fast (inertial oscillations 1 waves), which proves useful in understanding the flow dynamics. Through a detailed energy budget analysis, we find that the anticyclonic eddy acts as a catalyst in transferring wind-driven inertial energy to propagating waves. While the eddy sets the spatial scales of the waves, it does not participate in any energy exchange. Near-inertial propagation through the eddy core results in the formation of multiple critical levels with the largest accumulation of wave energy at the base of the eddy. A complementary ray-tracing analysis reveals critical-level formation when the surface-confined inertial rays originate within the negative vorticity region. In contrast, rays originating outside this region focus at the base of the eddy and can propagate at depth.
Fichier principal
Vignette du fichier
[15200485 - Journal of Physical Oceanography] Near-Inertial Energy Propagation inside a Mediterranean Anticyclonic Eddy.pdf (2.13 Mo) Télécharger le fichier
Origine Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-03145828 , version 1 (03-12-2021)

Licence

Copyright (Tous droits réservés)

Identifiants

Citer

Marie-Pascale Lelong, Yannis Cuypers, Pascale Bouruet-Aubertot. Near-inertial energy propagation inside a Mediterranean anticyclonic Eddy. Journal of Physical Oceanography, 2020, 50 (8), pp.2271-2288. ⟨10.1175/jpo-d-19-0211.1⟩. ⟨hal-03145828⟩
130 Consultations
33 Téléchargements

Altmetric

Partager

More