160 W 150 140° 130° 120° 1 10 c 

 40 N 



30 



20" 











> SAN 



a\diego 







^ 



HONOLULU 











Figure 9. Track of USS MARYSVILLE showing locations where temperature 

 data were collected between San Diego and Honolulu during NEL Thermistor 

 Chain Cruise 4. 



smoothed spectral ordinates for two isotherms, one in the main 

 thermocline and one below, for each of the 16 data sections A 

 through P, were obtained as follows: 



U(h) 



X = n-1 



R(0) 



V R(\)/l + cos nh\ 



A= 1 



n\h 



(6) 



where h = 0, 1, 2, 3 



and A = 0, 1, 2, 3 



n, index number of frequency 

 (actual frequencies are given by 

 h/ ( 2AO cycles/ minute, 

 M = 1/2 minute), 



n, lag number. 



The individual spectrum for the 32 computations showed no 

 single dominant frequency but, instead, showed many peaks in the 

 spectral curves within the range of to 0.35 cycle per minute. 

 The resolution into narrow frequency bands was prevented by the 

 short duration of the sample sections. The frequency band re- 

 solved was 0.007 cycle per minute for 144 lags. However, 



24 



