On the west side of the Atlantic, this high level of motion would take 

 place in a strip about 50 miles wide and 800 meters deep. The velocity 

 gradients in this strip would generally not exceed 0.0002 sec in a 

 horizontal direction and 0.005 sec" vertically. 



Additional energy concentrations are found in "eddies" outside 

 the general course of the Gulf Stream as well as in the counter current 

 flowing beneath it. In both cases, measurements by Swallow and Worthing- 

 ton (1957) showed that mean velocities of about 10 cm sec were not the 

 exception. These eddies are not considered to be included in the random 

 background turbulence. On the other hand, Swallow (1957) has obtained 

 deep current velocities of the order of 1 cm sec" near Salvage Island. 



Outside the relatively small volume of strong streaming motion, 

 the highest velocities are probably tidally induced. These velocities, 

 of the order of 10 cm sec (Bowden 1954), have the additional feature 

 of being periodic. 



The above considerations do not give a very firm basis for esti- 

 mating the turbulent velocity fluctuations in deep ocean. For want of a 

 better guess, it will be assumed that they do not exceed about 1 cm sec . 



Energy Dissipation 

 An estimate of the maximum rate at which mechanical energy is 

 supplied to the ocean by the moon can be made on the basis of the 



secular acceleration of the moon. Jeffries (1952) estimates that lunar 



19 -1 

 forces do work on the earth at the rate of 1.4x10 ergs sec . If 



the assumption is made that this energy is delivered uniformly over the 



