Figure 17. — Correspondence between adjusted area in Grand Banks sector 

 and sea level difference, Charlston-Bermuda departure, 131/2 months earlier. 

 Dots show adjusted area derived from observed boundary. Circles show 

 adjusted area computed from A - 6.4 (H - 5.07) + 1.85. Shape of curves 

 derived from changes in H. 



from a consideration of the dynamic topography of the sea surface 

 alone. The dynamic topography at the 100-decibar surface has 

 been compared with that at the surface in surveys made in previous 

 years and in general the current patterns have been found to be 

 similar. The current patterns found at the surface and at the 

 100-decibar surface have been compared and found to be similar 

 for each of the two occupations of the triangle made in 1951. The 

 dynamic topography of the surface found during the second cruise 

 has been shown in figure 8. That found during the post-season 

 cruise is shown in figure 18. The dynamic topography of the sea 

 surface obtained from the triangle indicates that any bergs enter- 

 ing the area from the north would have followed the eastern branch 

 of the Labrador Current if they had crossed the 49th parallel east- 

 ward of about 53° W., whereas those crossing the 49th parallel 

 westward of that longitude would have either followed the western 

 branch or stranded on the northern slope of the Grand Banks. It 



47 



