SEA SURFACE 





CURRENT 20°Cl. COLDER AREA w*. 



DIRECTION ,f 'X 20 °C ,\ ... 



T" —. "■'""' ^"'"i'v' '„ r-'\-i5°c~.' : '' ; r " : ^v^ :: >--~. .-."^"-' --.""" --'•'.■■ •-•-.^.c, '.."•• '"""'-•■■C-.-— : — .Cii 

 y^^w^i^c' "'"^^colderI^^/^ "z"-shaped pattern 



^"..>~Cr ' 13°0~AREA ^_ _,__ 13 o c 



13°C ~ r"~*\J 



na^^ 1 



^ QJJ6 '^" 



Figure 8. Colder thermal area above and below the thermocline (Position 3; fig. 5). 



Here the "Z"-shaped temperature inversion implied that the upper 

 part was moving to the right or in the same direction as the tow, 

 whereas the "S"-shaped inversion of the second example implied 

 that the upper of the two layers was moving in a direction opposite 

 to the tow. 



Ridge (or Dome] 



The fourth example (fig. 9), located just south of Baja 

 California, is marked as Position 4 (fig. 5). This thermal struc- 

 ture was characterized by a general ridge (or dome), and colder 

 water was found at the surface where the isotherms curved up to 

 intersect it. Maximum bowing occurred on the uppermost iso- 

 therms, but some doming was detectable to a depth of 500 feet. 

 The sloping isotherms of the ridge imply a geostropic current, 

 which probably means the presence of a current boundary at the 

 ridge. A net-divergency -type transport away from the ridge, as 

 well as parallel to it, is evident. 



13 



