parallel. There are also some meanders of Labrador Current water 

 on the northeast region of the Grand Banks and meanders of mixed 

 water extending from the eastern edge of the Labrador Current to 

 Flemish Cap and northward. Topographically there do not appear 

 to be any abnormalities for this time of the year and there do not 

 appear to be any atypical temperatures. 



In figure 22, drawn from data collected during the third survey, the 

 Labrador Current is found to be very well defined with only slightly 

 diminished current velocities from those found during the first and 

 second surveys. Labrador Current water now extends as far east- 

 ward as station 8568, farther westward onto the Banks, and farther 

 south than during the first survey. The southerly deflection of the 

 Atlantic Current water south of the Tail is more pronounced than 

 previously. There is also considerable wandering of northward- 

 flowing mixed water between 43° N. and 45° N. that was not previously 

 present and Atlantic water velocities are higher than they had been. 

 At stations 8596, 8613, 8615, and 8616, varying from 150 meters to 

 bottom, T-S relationships hint at an intrusion of Labrador Current 

 water, which ma}" have reached this location via the northern and 

 eastern slopes of Flemish Cap. 



The dynamic topography found during the fourth survey is shown in 

 figure 23. There appears to be little change between conditions 

 found during the second and fourth surveys. The Labrador Cur- 

 rent follows essentially the same path wnth slightly lower magnitudes. 

 The dynamic topography shows little relief in the northeastern part 

 of the area during both the second and fourth surveys, and consider- 

 ably less relief in the area of Flemish Cap than was found during the 

 second survey. Labrador Current velocities are slightly less than 

 they were during the second survey. 



Figure 24 represents the dynamic topography of the Bonavista 

 triangle found during the postseason survey. The Labrador Cur- 

 rent shows a remarkably simple pattern, with the greatest amount 

 of w^ater moving directly across the surveyed area from the northwest 

 to the southeast with less meandering of Labrador Current water 

 across the southwest leg of the Bonavista triangle onto the Banks 

 than there was during earlier surveys of this year. The western 

 branch of the Labrador Current represents a very small and minor 

 portion of the current as a whole, and unless bergs were kept close 

 inshore by easterly winds, they would probably be carried out over 

 the slope of the banks by the main body of the current. 



Labrador Current water and Atlantic Current water present in tlie 

 Grand Banks region have characteristic temperature-salinity relation- 

 ships that identify them as water masses. Usually the mixed water 

 formed from these parent water masses has a sufficiently uniform 

 proportion so that it can be regarded as a virtual water mass. The 

 solid lines in figure 25 represent the 1963 T-S averages based on 



53 



