0.35 



0.30 



0.25 



0.20 



a 0.15 



0.10 



0.05 



0.00 



1.2- 



1.1 



1.5. 



1.6 



1.4- . 1. 

 1.3- 



2-2 1.4, 



1.3 



1.3 1-7 



1.2- " -1.4 



2 - 4 1.7, 



! 1.4 1.5 



: 2j" 



1-5 ! 



■1.6 



•1.7 1.4 Il3 



•1 2 .1-4 



'■ z 1.5- 



'1.4 



1.4- -T.4 



1.2 



1.2 



1.5 M.l 



1.6 



2.1 



"1.3 1-3' 



1.3 



1.9 



1.2 



•4- --1.1 

 1.4 



1.1 



.1.5 



1-4 1 } 1. 



1.6 



1.4- '1.5 1-4 \ 



1.4 {f. 9 



1.4- yl.5 



1.2 



,1.2 L4 V 



1.4 



.1.1 



1.4- 

 1.3- 



1.2 



1.5 

 1.3. -1-3 

 1.2>1-1 



3 1.2^1-2 

 1.3' 1-2 



1.6 



V^l.8 1.3- 1-6 

 - ; 1.4 l-fr-.';2.2 



1.2 



1.4 



12 -1.3- -- 1 - 4 



1.6- "l.i 2.0 • 

 1.3-1.4 l- 5 r 1~7 L6 ] - 2 



1.2- 



1.2- 



1.3 



1.5-1.5 

 7 1.4 - 



' 1.4 



1.5 



1.3 



1.2 



1.2 1-3 



1*2 



1.2' 

 1.4 



1 3 i 

 1.5-1.5 . J 1.6- 



1.2 



1.5- 



1.5. 



: 1.3 



1.1 "1-1 



1 9 

 ! 4 . '' V 1.7M.3 

 • 1 2 



16 '..'.• ' 5 '.,8 



2.0. • ^.3 

 1.4 1.4 1.3-. 1-2 .1.1 



1.1, 1 - 3 '-1.3 

 ] - 2 - 1.3 ' 



I 1.4 1-3 



45 90 135 180 225 270 



DIRECTION OF TOW (DEGREES) 



315 



360 



Figure 29. Summary of di rect ion of tow distributions of power spectrum from successive 

 half-minute readings of isotherm depth below the main thermoct ine (deeper i sotherm). 

 Circled are the more significant ratios. 



accordance with the 90-percent confidence limits. The important 

 circled points fall at all frequencies and all directions of tow. 



The values show that the zones of significant frequencies of 

 vertical changes in isotherm depths vary widely from sample to 

 sample. No power spectrum peak ratio to background value 

 exceeds 2.5. The higher values appear to be distributed in patches. 



A similar presentation of the deeper isotherm power 

 spectrum (fig. 28) shows the circled higher peak values again 

 occurring at all directions of tow. However, slightly more 

 values over 1.6 at the higher frequencies are apparent, especially 

 when towing to the east or south. This contrasts with the omni- 

 directional distribution of the shallow-isotherm power spectrum. 



58 



