Figure 25. — Temperature-salinity relationships for Labrador Current water, 

 Atlantic Current water and mixed water found in the Grand Banks region. 

 Solid lines show conditions found during 1963 and broken lines represent the 

 16-year means. 



observations made during the first, southern part of the second, and 

 third surveys; the dashed hnes illustrate the normals for the 16-year 

 period 1948-63. As in 1962, the 1963 temperature minimum in the 

 Labrador Current was located near 50 meters rather than the more 

 normal depth of 75 meters. The Labrador Current was warmer and 

 saltier than normal through the greatest depths examined (1,500 

 meters), resulting in slightly greater densities than normal. The 

 Atlantic Current was colder than normal to 1,500 meters and fresher 

 than normal to 800 meters; the resultant increase from normal of 

 the densities was significant only below 400 meters. The mixed water 

 was warmer than normal to 600 meters; the salinities and densities 

 were greater than normal through 1,500 meters. On the third survey 

 (May) the Atlantic Current was colder than the first survey (April) 

 at the depths 100 to 600 meters. 



Figure 26 shows the location of the section across the Labrador Sea 

 occupied during the postseason survey and gives the dynamic topog- 

 raphy of the sea surface in the vicinity of the section. It must be 

 remembered that the fragmentary dynamic topography shown is not 

 the result of a network survey and while having some support from 

 GEK observations, it is principally useful in showing the location of 

 the steeper gradients. It is interesting to note that in location, direc- 

 tion, and density, the dynamic topography of the Labrador Sea section 

 has been fairly uniform through the years, although the West Green- 

 land Current is much weaker in 1963. 



In figure 27 the Labrador Current shows the usual characteristic 

 temperature distribution with a negative temperature core over the 



54 



