vertical movement past the 1,000-decibar surface within the triangle 

 has been considered to be negligibly small. 



The dynamic height of the sea surface at South Wolf Island, 

 Labrador, was somewhat higher than the dynamic height of the sea 

 surface at Cape Farewell, Greenland (with reference to the 1,500- 

 decibar surface m each case) . This is not unusual and has been inter- 

 preted as the result of water entering the Baffin Bay-Labrador Sea 

 system through the northern openmgs. Below a depth of about 200 

 meters, however, the water above the 1,500-decibar surface had a net 

 northwesterly direction of flow, and for the entire section from South 

 Wolf Island to Cape Farewell between the sea surface and the 1,500- 

 decibar surface the net volume transport of 0.75 million cu.m/sec 

 northwesterly was found. If there is a net transport through the 

 northern openings into the Baffin Bay-Labrador Sea system, then 

 the sinking past the 1,500-decibar surface must have exceeded these 

 contributions by three-quarter million cu.m/sec. 



SUMMARY 



1. The surface circulation in the Grand Banks region and the adja- 

 cent area northward of the Grand Banks has been discussed on the 

 basis of the dynamic topography found during tliree surveys made 

 during the season. The exceptional absence of ice permitted, for the 

 first time, the survey in April of the area from 47° N., to 54° N., 

 between the Labrador Shelf and about 45° W. The season was char- 

 acterized by a major recurvature of Labrador Current water north- 

 ward, north of the latitude of Flemish Cap. 



2. The circulation in the upper 1,000 meters in the Grand Banks 

 region, with particular reference to the Labrador Current, has been 

 given in greater detail on the basis of volume transport, mean tem- 

 perature, minimum observed temperature and heat transport found 

 during 18 occupations of 9 selected sections during the 1952 season. 

 At three of these sections, for which the normal seasonal variation is 

 available, the 1952 deficiency of the Labrador Current has been given. 



3. The temperature-salinity relationships for the three water masses 

 found in the Grand Banks region in 1952 have been compared with 

 conditions found in other years. 



4. The relationship between the location of the northern boundary 

 of North Atlantic Current water m the Grand Banks region, the 

 strength of the Labrador Current, and the difference in sea level be- 

 tween Bermuda and Charleston has been given further study with 

 the results indicating that whereas the time lag between the Charles- 

 ton-Bermuda section and the Grand Banks region was about 13K 

 months for the 27 surveys made during the period 1934-41, the lag 

 was apparently 11}^ months for the 10 surveys made during the period 

 1948-52. 



5. The circulation m the southern part of the Labrador Sea has 

 been inferred from examination of the dynamic heights along a section 



54 



