The use of significant wave height to improve the accuracy of wind derived stress.

Dr. Mark A. Bourassa, COAPS/FSU, Tallahassee FL 32306-3041
email: bourassa@coaps.fsu.edu
WWW: http://coaps.fsu.edu/~bourassa

With David M. Legler and James J. O'Brien

Satellite derived wave heights can be used in conjunction with observed winds to remove the assumption of wind-wave local equilibrium. A model for significant wave height is coupled with a surface flux model to demonstrate the dependence of surface fluxes on wave characteristics.





Wave age (cp /u*) as a function of wind speed and significant wave height. The red line shows local-equilibrium values predicted by Bourassa et al. (1996).


Significant slope (Hs / L , where L is the dominant wavelength ) as a function of wind speed and significant wave height. The red line shows local-equilibrium values predicted by Bourassa et al. (1996).


Change in stress from the local equilibrium value at the same wind speed (% relative to the equilibrium value). The upturn at low wind speeds occurs because of mixing induced by capillary waves.

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