114 



from offshore to the southwest, and this action, moreover, had 

 tended to deepen the vortex by about 10 dynamic centimeters. The 

 steepening of the sides of this hollow had correspondingly intensified 

 the currents around the center so that velocities as high as 1.3 knots 

 per hour are recorded on Figure 54. The distribution of critical 

 temperatures on Figure 55 discloses a wedge of warm water had 

 invaded the locality immediately off the southwest slope from off- 

 shore. The western side of the picture shows cold inshore water of 

 northern origin curling around the western extremity of this warm 

 wedge to the southeastward, so that the birth of an anticyclonic 



^^ 



SURFACE. OlSTK,ie>UTlON OF LIG-HTEL&T WATER. 



S-3 S> 52. 



Fig. 56. — Set II. Distribution of light and heavy water on the surface of the sea 



rotating eddy is clearly indicated off the southwest slope of the 

 Bank. The lightest water on the surface lay in over the Bank and 

 also offshore at the outer stations, a distribution very similar to that 

 which prevailed two weeks earlier. 



SET III 



A study of the dynamic topographical map for the period June 25 

 to 29 shows that the hollow in the sea surface off the southwest slope 

 of the Bank (figs. 49 and 53) had again expanded to about the same 

 form as in early May, except for being slightly more elongate and 

 curling a few miles further to the eastward. A trough extended 

 southward paralleling the east slope of the Bank and at a distance 

 out about 50 miles. The direction and velocity of the currents are 

 shown on Figure 58 as also the drift of two bergs which were sighted 



