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Relative current effect on short wave growth

Abstract

Short waves growth is characterized by nonlinear and dynamic processes that couple ocean and atmosphere. Ocean surface currents can have a strong impact on short wave steepness and breaking, modifying the surface roughness, and consequently their growth. However, this interplay is poorly understood and observations are scarce. This work uses in situ measurements of near-surface winds, surface current, and waves under strong tidal current conditions to investigate the relative wind speed effect on the local short waves growth. Those observations were extensive compared with numerical modeling using WAVEWACHIII, where the simulations repeatedly fail to reproduce the observed wind sea energy under strong current conditions. Our field observations and coupled ocean-atmosphere numerical simulations suggest that surface currents can strongly modulate surface winds. That is a local process, better observed closer to the boundary layer than at 10 m height. Yet, it can cause a significant impact on the local wind shear estimation and consequently on the local waves’ growth source term. The results presented here show that the relative wind effect is not well solved inside spectral waves models, causing a significant bias around the peak of wind sea energy.

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Notes

  1. Global Navigation Satellite System

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Acknowledgements

We thank all the TOIS group at LOPS, O. Peden, for his contributions to buoy tests and the crew of R/V Thalia for their performance during the BBWAVES-2016 experiment.

Funding

The work described here is supported by DGA under the PROTEVS program, LabexMer via grant ANR-10-LABX-19-01, and CNES as part of the CFOSAT and SWOT preparatory program.

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Correspondence to Pedro Veras Guimarães.

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Conflict of interest

The authors declare no competing interests.

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Responsible Editor: Amin Chabchoub

Author contribution

P.V. Guimarães, F. Ardhuin: Conceptualization, methodology, field experiment, numerical simulations, investigation, writing. Y. Perignon, A. Benetazzo: Conceptualization, methodology, field experiment, investigation, writing. M-N. Bouin: Field experiment, coupled air-sea numerical simulations and OCARINA data processing. M. Accensi: Discussion, field experimental and numerical simulations support. V. Garnier, J-L. Redelsperger: Discussion and coupled numerical simulation support. J. Thomson: Discussion and SWIFT data processing.

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The datasets generated during the current study are available from the corresponding author on reasonable request.

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Fabrice Ardhuin and Yves Perignon contributed equally to this work.

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Guimarães, P.V., Ardhuin, F., Perignon, Y. et al. Relative current effect on short wave growth. Ocean Dynamics 72, 621–639 (2022). https://doi.org/10.1007/s10236-022-01520-0

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  • DOI: https://doi.org/10.1007/s10236-022-01520-0

Keywords

  • Air-sea interaction
  • Wind waves
  • Waves growth
  • Strong current