The computed autocorrelations of all the selected isotherms on 

 each sample section of the cruise were plotted for comparison in 

 Appendix B. 



One example of the autocorrelation is shown in figure 6 . 

 Starting with zero lags (0 minutes) the autocorrelation R-^ is 1.0, 

 but as the lags increase the correlation becomes less and in some 

 cases negative. In this example, after 60 lags the value of R-^ is 

 reduced to 0.76; 120 lags, 0.64; and 144 lags, 0.61. 



In order to summarize the autocorrelation of successive 

 depth changes with time and distance, two points were scaled off 

 the individual plots of autocorrelation, one at 60 lags (30 minutes) 

 and another at 120 lags (60 minutes). Then, in order to compare 

 these autocorrelations with those of other sample sections they 

 were plotted with reference to longitude on the section between San 

 Diego and Honolulu (fig. 7). 



The upper part of figure 7, identified as A, shows the auto- 

 correlations for the lags at 60 and 120 half -minute stops (is A = 60 

 and 120) for the isotherm in the main thermocline whereas the 

 lower figure, B, is a similar presentation for the isotherm chosen 



30 40 



MINUTES 



Figure 6. Example of aulocorrelaHon of successive half-minute readings of ffie depth of 

 20° C isotherm on section H. The 60-lag (30-minute) and 120-lag (60-minute) values are 

 indicated. (\=60 and 120 respectively ). 



17 



