the relative strengths of the Labrador Current and the Atlantic 

 Current. The relationship was adopted that the area would be 

 increased by 10,000 square kHometers for each million cubic meters 

 per second volume of flow of the Labrador Current entering the area 

 past section U. After adjustment of the measured area by the sub- 

 traction of the appropriate area for the measured volume transport of 

 the Labrador Current, the remaining adjusted area, A, was considered 

 to represent the effects of causes associated with the North Atlantic 

 eddy. 



Assuming that changes in the strength of the North Atlantic eddy 

 were proportional to changes in the difference in sea level between 

 Bermuda and Charleston, S. C, the fluctuation of the value, sea level 

 at Charleston mmus the departure from average at Bermuda, was 

 studied m relation to fluctuations in the adjusted area If A is 

 expressed m units of 10,000 square kflometers and H is the sea level at 

 Charleston minus the Bermuda departure m feet 13% months earlier 

 tor 27 surveys made over the period 1934 to 1941 the adjusted area 

 was given by the expression 



A=6.8(H-5.07) + I.34 



Since the resumption of oceanographic work by the International 

 Ice Patrol following World War II the following surveys have been 

 made; one m 1948, two in 1949, three in 1950, two m 1951 and two in 

 1952. The above relationship could not be followed for these 10 

 postwar surveys, even approximately, untfl it was realized that 

 instead of a phase difference of 13}^ months, the postwar observations 

 had a similar relationship but with a phase difference of 11}^ months 

 Keepmg these two different time lags, the combmed 37 surveys give 

 the relationship 



A-6.97(H-5.07) + 1.67 



for computing the adjusted area with a probable error of ±1 5X10* 

 square kilometers. No explanation is offered for the apparent 

 change of 2 months in the time lag. 



The dynamic topography of the sea surface deduced from the data 

 coUected during the occupation of the section across the Labrador Sea 

 from South Wolf Island, Labrador, to Cape Farewell, Greenland, 

 durmg the postseason cruise is shown in figure 13. Off South Wolf 

 Island the Labrador Current is seen to have two bands separated by 

 the shoal off Hamilton Inlet. Offshore of the major band over the 

 continental slope there seems to be a closed cyclonic eddy. Seaward 

 of this, at about 56° N., 52° W., the dynamic topography is inter- 

 preted as showing the extreme northwestern margins of the North 

 Atlantic eddy as this northward flowing water curves to the eastward; 

 Northward of this the outer margin of the North Atlantic eddy is 



46 



