GEOGRAPHIC DISTRIBUTION 



From the power spectrum slopes of each data sample a 

 geographic distribution of slope values for the shallower isotherm 

 is presented (fig. 37). Values of power spectrum slopes range 

 from -0.66 to -1.94. The lower values are generally near the 

 coast and describe a pattern similar to that of other variables. 

 A similar geographic distribution of the deeper-isotherm slope 

 values (fig. 38) is more irregular than that of the shallower one 

 and has slightly smaller values. 



24 



23° H 



22 c 



21 c 

 N 



20 c 



-1.7 

 Hi 



-1.3 



.#// ' 15 



1 1' I i ~? 7 SAN LUCAS 

 -1.3 / 7/ -1-5. „ 



SHALLOW ISOTHERM 

 SLOPE, U(h) 



T 



MAZATLAN 



„-- --1.5 



113 c 



112° 



lll c 



110° 



109 c 



107° 



106 c 



Figure 37. Geographic distribution of slope of power spectrum curve from successi\ 

 half-minute readings of isotherm depth in the main thermocl ine (shallower isotherm) 

 (frequencies 0.05 to 0.30). 



70 



