Thermodynamical effects of ocean current feedback in a quasi-geostrophic coupled model - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Physical Oceanography Année : 2024

Thermodynamical effects of ocean current feedback in a quasi-geostrophic coupled model

Résumé

Abstract Air-sea fluxes are the main drivers of ocean circulation, yet their representation in ocean only models remains challenging. While a zeroth-order formulation accounting only for the state of the atmosphere is well adopted by the community, surface ocean feedback has gained attention over the last decades. In this paper, we focus on thermodynamical indirect feedback of surface ocean currents, which completes the ’ eddy killing ’ effect induced by the mechanical feedback. In this study, we quantify both the mechanical and thermodynamical contributions in the context of idealized, coupled Quasi-Geostrophic simulations through sensitivity experiments on wind stress formulation. As compared to eddy killing which impacts kinetic energy levels, the indirect thermodynamical feedback induces significant changes in potential energy levels. The thermodynamical feedback also enhances by +27% the potential-to-kinetic turbulent energy conversion induced by relative wind stress formulation, as well as significant changes in both forward and inverse cascades of Potential Energy (PE). That is, accounting for ocean surface currents in the computation of wind stress significantly changes transfers of PE from the mean to the turbulent flow. These changes are mostly controlled by a reduced upscale energy flux rather than a more vigorous downscale flux, a process in line with results obtained for kinetic energy fluxes associated with the eddy killing effect.
Fichier principal
Vignette du fichier
Lorenz_QGCM_rev02_submitted_no_cover_letter.pdf (31.73 Mo) Télécharger le fichier
Origine Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-04606538 , version 1 (10-06-2024)

Licence

Identifiants

Citer

Quentin Jamet, Alexandre Berger, Bruno Deremble, Thierry Penduff. Thermodynamical effects of ocean current feedback in a quasi-geostrophic coupled model. Journal of Physical Oceanography, 2024, pp.1-33. ⟨10.1175/JPO-D-23-0159.1⟩. ⟨hal-04606538⟩
25 Consultations
5 Téléchargements

Altmetric

Partager

Gmail Mastodon Facebook X LinkedIn More