620 



BULLETIN OF THE BUREAU OF FISHEKIES 



eastern side of the picture 

 (station 10311), resulting 

 from the active tidal stir- 

 rmg, is characteristic of late 

 sumnier.^^ 



The low surface read- 

 ing of 9.4° on German Bank 

 was unexpected, because the 

 whole underlying column 

 and the surface water to the 

 east as well as to the west 

 of the station were slightly 

 warmer. Probably this 

 local chilling had its source 

 in some upwelling from the 

 still colder bottom water 

 close in to Cape Sable. 



In summers following 



periods when the inflowing 



g. bottom current has been 



weaker, or at least less regu- 

 M lar (1913, for instance), cross 



1 profiles of the gulf bring out 

 I the cold mid layer even 

 ■J more clearly (fig. 63), with 



minimum readings of about 

 5.2° in both sides of the 

 gulf at depths of 75 to 90 

 meters in this particular 

 year. But, contrasting 

 with tliis same month of 

 1914 and of 1915, the profile 

 for 1913 shows only a frac- 

 tional warming with in- 

 creasing depth, from this 

 level downward toward the 

 bottom, with no apparent 

 banking up of the warmer 

 bottom water against the 

 eastern slope.'^ 



".'The isotherm for 10° for this regioii, 

 ou my earlier representation o( tliis pro- 

 file, is incorrect (Bigelow, 1017, fig. '1). 



'« Highest value at n.l meters 0.6° off 

 Cashes Ledge (station 10090); lowest 6.9° 

 in the eastern side of the hasiii Cstation 

 10093). 



