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Journal Articles Boundary-Layer Meteorology Year : 2020

On the Impact of Long Wind-Waves on Near-Surface Turbulence and Momentum Fluxes

A Ayet
L. Marié
  • Function : Author

Abstract

We propose a new phenomenological model to represent the impact of wind-waves on the dissipa-tion of turbulence kinetic energy near the sea surface. In this model, the momentum flux at a given height results from the averaged contribution of eddies attached to the sea surface whose sizes are related to the surface geometry. This yields a coupling between long wind-waves and turbulence at heights of about 10 m. This new wind-and-waves coupling is thus not exclusively confined to the short wave range and heights below 5 m, where most of the momentum transfer to the waves is known to occur. The proposed framework clarifies the impact of wind-waves on Monin-Obukhov similarity theory, and the role of long wind-waves on the observed variability of momentum fluxes. This work reveals which state variables related to the wind-and-waves coupling require more accurate measurements to further improve wind-over-waves models and parametrizations.
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Dates and versions

hal-02384291 , version 1 (28-11-2019)

Identifiers

Cite

A Ayet, Bertrand Chapron, Jean-Luc Redelsperger, Guillaume Lapeyre, L. Marié. On the Impact of Long Wind-Waves on Near-Surface Turbulence and Momentum Fluxes. Boundary-Layer Meteorology, 2020, 174, pp.465-491. ⟨10.1007/S10546-019-00492-X⟩. ⟨hal-02384291⟩
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