Ill bulletin 42, figures 23, 24, 25 and 26, year to year fluctuations in 

 the temperature, salinity, and density of the intermediate and deep 

 water of the Labrador wSea were presented for the prewar and postwar 

 periods. With the necessary corrections applied to the postwar data 

 much of the difference l)ctweeii the two periods disappears. Figure 

 26 of bulletin 42 has been redrawn with corrected values and extended 

 through 1960 and is presented in this bulletin as figure 44. 



Figures 24 through 28 show chronologically the dynamic topography 

 found during the four surveys made during the season and the post- 

 season occupation of the Bonavista triangle. Notable in the first 

 survey, figure 24, is the weakness of the Labrador Current at the 

 Tail of the Banks, the relatively small area of cold mixed water 

 southeastward of the Tail, and the correspondingly great northwest- 

 ward and westward incursion of Atlantic Current water toward the 

 Grand Banks at the 42d and 44th parallels. 



Comparison of figure 24 with figure 25 indicates a weakening of the 

 Labrador Current between about latitudes 45° X., and 45°30' N. 

 (the northern margin of the first survey and the southwestern margin 

 of the second survey). The pronounced meander of Atlantic Current 

 water toward the Grand Banks seen at the 44tli parallel in figure 24 

 is probably responsible for the clockwise eddy present in the southern 

 edge of the second survey between longitudes 46° W., and 47° W. 

 It is also noted that figure 25 sliows some possibility of ])ergs moving 

 southeastward between Flemish Cap and the Grand Banks. 



Figure 26 sliows the dynamic topography of the Bonavista triangle 

 found during the third survey. The current pattern along the south- 

 western side of the triangle is somewhat simpler than usual, although 

 the westward flow near the southei'ii corner may recurve eastward 

 south of tlie surveyed area instead of continuing westward across the 

 banks as suggested by the figure. 



The fourtli survey (fig. 27) again shows a warm water clockwise 

 eddy, centered at about 44°30' X., 48° W., which is considered to be 

 a remnant of an earlier meander of the Atlantic Current. Between 

 this eddy and another Atlantic ( 'ui-i'cnt meander northeastward of it, 

 there is a weak eastward meander of Labrador Current water. As in 

 tiie second survey, some of the Labrador Current meanders onto the 

 Grand Banks at about the 46th parallel. The southern edge of the 

 surveyed area shows a remarkably wide quiet area south of tiie north- 

 ernmost band of the Atlantic Current. 



Comparison of figure 28 with figure 26 shows that there was a slight 

 weakening of the Labrador Current between the third survey and the 

 l^ostseason cruise. Xormally the change would be in the other direc- 

 tion. The geographical division between the eastern and western 

 branches of the Labrador ( \irrent changed oft"shore during the interval. 

 Figure 26 indicates that southward moving bergs crossing the 49th 

 parallel eastward of about 51°4()' \V., would follow the eastern branch 



43 



