536 



BULLETIN OF THE BUBEAU OF FISHEBIES 



O Q O Q 



"<T to CO O 



CNJ oi CM (^ 



the simpler explanation that 



temperatures slightly higher 



at the surface than a few 



meters down merely reflect 



the first stage in the vernal 



warming by the sun, which 



proceeds throughout the 



i spring months. Probably 



?f the upper 10 meters would 



;;;; have been found homogen- 



f eous in temperature in the 



S coastal zone, or the surface 



I slightly the coldest level 



" then, had the profile been 



§ run two weeks earlier in 



■^ the season. 



c The increase of tem- 



■> perature from the shore 

 S seaward is again illustrated 



o 



'^. on the corresponding pro- 

 « file of the eastern side of 

 I the gulf (fig. 16). In this 

 I case, however, the courses 

 I of the isotherms are com- 

 ^ plicated by the fact that 

 £ this particular profile cuts 

 g, the westward extension of 

 I the warm core that enters 

 a the gulf via the Eastern 

 I Channel (pp. 526 and 529). 

 ^ Consequently, the profile 

 I shows the curves for 2, 3, 

 I 4, and 5 degrees, rising con- 

 fe siderably nearer to the sur- 

 B face over the northern 

 f slope of the basin (station 

 " 20055) than closer inshore, 

 £ on the one hand (station 

 20056), or in the deeper 

 water of the basin, on the 

 other (station 20054), in- 

 denting the cold (1° to 2°) 

 surface layer from below. 

 Readings taken at a 

 depth of 40 to 50 meters 



