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On momentum flux and velocity spectra over waves

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Abstract

Data from a research tower in Lake Ontario are used to study the validity of Monin--Obukhov scaling in the marine atmospheric boundary layer under various wave conditions. It is found that over pure wind seas, the velocity spectra and cospectra follow established universal scaling laws. However, in the presence of swells outrunning weak winds, velocity spectra and cospectra no longer satisfy universal spectral shapes. Here, Monin–Obukhov similarity theory, and the classical logarithmic boundary layers, are no longer valid. It is further shown that, in the presence of such swells, the momentum flux can be significantly modified in comparison to pure wind sea values. The implications of these findings for bulk flux estimations and on the inertial dissipation method for calculating fluxes are discussed.

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Drennan, W.M., Kahma, K.K. & Donelan, M.A. On momentum flux and velocity spectra over waves. Boundary-Layer Meteorology 92, 489–515 (1999). https://doi.org/10.1023/A:1002054820455

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