Yahia H., Garçon V., Sudre J., Maes Christophe. (2018). Effect of wind stress forcing on ocean dynamics at air-sea interface. Frontiers of Information Technology and Electronic Engineering, 19 (8), p. 1056-1062. ISSN 2095-9184.
Titre du document
Effect of wind stress forcing on ocean dynamics at air-sea interface
Frontiers of Information Technology and Electronic Engineering, 2018,
19 (8), p. 1056-1062 ISSN 2095-9184
We evidence and study the differences in turbulence statistics in ocean dynamics carried by wind forcing at the air-sea interface. Surface currents at the air-sea interaction are of crucial importance because they transport heat from low to high latitudes. At first order, oceanic currents are generated by the balance of the Coriolis and pressure gradient forces (geostrophic current) and the balance of the Coriolis and the frictional forces dominated by wind stress (Ekman current) in the surface ocean layers. The study was conducted by computing statistical moments on the shapes of spectra computed within the framework of microcanonical multi-fractal formalism. Remotely sensed daily datasets derived from one year of altimetry and wind data were used in this study, allowing for the computation of two kinds of vector fields: geostrophy with and geostrophy without wind stress forcing. We explore the statistical properties of singularity spectra computed from velocity norms and vorticity data, notably in relation with kurtosis information to underline the differences in the turbulent regimes associated with both kinds of velocity fields.
Plan de classement
Dynamique des eaux [032DYNEAU]
;
Océanographie [126TELAPP05]
Descripteurs
OCEANOGRAPHIE PHYSIQUE ; INTERFACE OCEAN ATMOSPHERE ; DYNAMIQUE DE L'EAU ; TURBULENCE MARINE ; COURANT MARIN ; TENSION DU VENT ; TELEDETECTION SPATIALE ; TRAITEMENT DU SIGNAL ; ANALYSE STATISTIQUE ; COURANT D'EKMAN
