Turbulence Over Camarinal Sill and Its Impact on Water Mixing—Strait of Gibraltar - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Geophysical Research. Oceans Année : 2024

Turbulence Over Camarinal Sill and Its Impact on Water Mixing—Strait of Gibraltar

Résumé

Abstract Straits and narrows are the place of intensified turbulent mixing. Deep understanding of the turbulent dynamics at these locations is of crucial importance as it conditions the properties of the water masses flowing in the open ocean. A new extensive field experiment, PROTEVS GIB20, with high frequency measurements has been conducted in the Strait of Gibraltar. It allows us to infer dissipation rates of the turbulent kinetic energy, ϵ , from two consistent methods. The range of ϵ is depicted for the different processes which developed in the vicinity of Camarinal Sill, the main topographic feature of the Strait of Gibraltar. It evidences that the bottom boundary layer, hydraulic jumps and large overturns are the main loci of intensified turbulence reaching 10 −3 W.kg −1 . The variability of the turbulence is mainly controlled by semi‐diurnal, diurnal and fortnightly tidal oscillations. Spatially, the western flank of Camarinal Sill is evidenced as the hotspot for turbulent mixing. We confirm a weak variation of the spatially averaged vertically integrated turbulent dissipation rate. This result needs to be qualified in view of the differentiated impact of the various processes on adjacent water masses. The dynamics of the spring tide directly mix Atlantic and Mediterranean waters, resulting in a large spreading of the T‐S diagram.
Fichier principal
Vignette du fichier
JGR Oceans - 2024 - Roustan - Turbulence Over Camarinal Sill and Its Impact on Water Mixing Strait of Gibraltar.pdf (6.03 Mo) Télécharger le fichier
Origine Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-04650354 , version 1 (17-07-2024)

Licence

Identifiants

Citer

Jean‐Baptiste Roustan, Pascale Bouruet-Aubertot, Lucie Bordois, Yannis Cuypers, Xavier Carton, et al.. Turbulence Over Camarinal Sill and Its Impact on Water Mixing—Strait of Gibraltar. Journal of Geophysical Research. Oceans, 2024, 129 (6), ⟨10.1029/2023jc020709⟩. ⟨hal-04650354⟩
0 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Mastodon Facebook X LinkedIn More