Pierson, Tick, and Baer 



frequencies toward low frequencies. It would be useful to discuss the ways 

 these modern methods actually improve on earlier methods. They are substan- 

 tial, but, nevertheless, the earlier methods had considerable validity. 



With reference to nonlinear energy transfer, there are contradicting theo- 

 ries as to what actually happens to trains of long-crested intersecting waves. 

 There is some evidence that a simple frequency adjustment is all that is needed 

 to obtain realistic steady-state third-order results. The cited work of Snod- 

 grass et al. (1), in our opinion, does not conclusively demonstrate the existence 

 of this phenomenon on a geophysical scale. More definitive theories and obser- 

 vations are both needed. 



ADDITIONAL REFERENCES 



29. Phillips, O.M., "The Dsmamics of the Upper Ocean," Cambridge University 

 Press, 1966 



30. Inoue, T., "On the Growth of Ocean Wave Spectra in Terms of a Miles- 

 Phillips Mechanism" (abstract only). Trans. A. G. U. Vol. 48(No. 1):139 

 (1967) 



31. Cardone, V.J., "Specification of the Wind Distribution in the Marine Bound- 

 ary Layer for Wave Forecasting" (abstract only), Trans. A. G. U. 48(No. 1): 

 139 (1967) 



32. Kitaigorodskii, S.A., and Volkov, Yu.A., "On the Roughness Parameter of 

 the Sea Surface and the Calculation of Momentum Flux in the Near-Water 

 Layer of the Atmosphere," Izv. Atmospheric and Oceanics Physics Series, 

 VoL l(No.9):973-988 (1965) 



532 



