3ta llonslb 



96. 



86.9 



58.0 7 CO 



87.0 



55.5 



Figure 16. The N-S Vertical Temperature Section in degrees Fahrenheit. 



August 11, 1954. 



ing is not the major cause for the greater thickness of ECC farther offshore. 

 More probably the varying thickness of the ECC is better explained in 

 terms of the varying wind stress westward. For qualitative indication of 

 this relationship one may use the Ekman wind transport equation (see e.g. 

 The Oceans, 1946:498): 



Tr ^ fw dz = (1/f ) Ta 

 where Ta is the wind stress at right angle to the current speed, w, and 

 transport, Tr, while f is the Coriolis parameter and the integration is taken 

 to large depth. 

 Take 



Ta — kv^ (2) 



where k is the product of the density of the air immediately above the 

 water surface and a resistance coefficient (Taylor, 1916). If the wind 

 stress is a sole function of x, then differentiating ( 1 ) with respect to x and 

 considering (2) one has 



dTr _ 1 dTa _ k dv^ 



dx "■ f dx ~ f dx (3) 

 For simplicity, suppose 



v^ = a sin (2nx/L) +b (4) 



• 59 



