The difference vector U - U represents approximately the 

 anisobaric mass transport M 2 to balance the mass transport M, 

 in the steady state, and 



*2 



= - f si na / 3j c 

 -D 



(19) 



With the hydrostatic equation 







0^ = " g / 37 dz ' 



and 



/ 



5y dz = " g 



-D 







o7 dz 



dz , 



the mass transport Mp can be written, approximately, 



?( 0A - PB } 



CL 9 , 



M2 = j g sina 



-D 7 - 1 * 



Ay 



dz 



dz 



(20) 



for two closely spaced stations, A and B, with a distance A y apart 



From the steady state condition, div M = 0, and from (18) and 

 (20) we have with the assumption that between the two closely 

 spaced stations the variation of M, and Mp can be neglected 



'0 r ,0 



T x = g sina 



AY J [J (p A - PB )d2 J dz ' 



(21) 



<-D -D 



This equation can be solved numerically for D, the level of no 

 motion. The zonal wind stress, T , can be determined from the 

 wind field, and with regard to a the assumption may be made that a 

 in the region of the equatorial current is approximately 5°-6° and 

 decreases to 1.5° in 60° latitude. 



26 



