On Growth Rate of Wind Waves: Impact of Short-Scale Breaking Modulations

Type Article
Date 2016-01
Language English
Author(s) Kudryavtsev Vladimir1, 2, Chapron Bertrand1, 3
Affiliation(s) 1 : Russian State Hydrometeorol Univ, 98 Malookhtinskii, St Petersburg 195196, Russia.
2 : Inst Marine Hydrophys, Sebastopol, Russia.
3 : IFREMER, Lab Oceanog Spatiale, Plouzane, France.
Source Journal Of Physical Oceanography (0022-3670) (Amer Meteorological Soc), 2016-01 , Vol. 46 , N. 1 , P. 349-360
DOI 10.1175/JPO-D-14-0216.1
WOS© Times Cited 11
Keyword(s) Atm, Ocean Structure, Phenomena, Atmosphere-ocean interaction
Abstract The wave generation model based on the rapid distortion concept significantly underestimates empirical values of the wave growth rate. As suggested before, inclusion of the aerodynamic roughness modulations effect on the amplitude of the slope-correlated surface pressure could potentially reconcile this model approach with observations. This study explores the role of short-scale breaking modulations to amplify the growth rate of modulating longer waves. As developed, airflow separations from modulated breaking waves result in strong modulations of the turbulent stress in the inner region of the modulating waves. In turn, this leads to amplifying the slope-correlated surface pressure anomalies. As evaluated, such a mechanism can be very efficient for enhancing the wind-wave growth rate by a factor of 2-3.
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