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

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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⟩
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