1934 1935 1936 1937 1938 !939 1940 1941 



^APPOX. VOL.OF FLOW FROM 



MEAN Ot CORRESPONDING 

 TO YEARLY AVE. T AND S 

 N;; OF LABRADOR CURRENT- 



lAROMETRIG PRESSURE 

 ANOMALIES ^""^ 



to 



6x 



2§ 



J 



A 



T 



o ^ 



> o 



< 



-4 



Igure 17. — Year to year fluctuations in volume of flow of Labrador Current at Section U: gradient in 

 barometric pressure anomalies between Cape Race, Belle Isle and Julianehaab; formula for forecasting 

 volume of flow at section U; and approximate fluctuation in volume of flow of the Labrador Current 

 in the Grand Banks region from yearly average temperatures and salinities. 



during an>- \ear A^; ^ is the average of the preceding December and 

 January gradients in barometric pressure anomaly in milHbars, Belle 

 Isle minus Julianehaab; and B is the preceding January gradient in 

 barometric pressure anomaly in millibars, Cape Race minus Belle Isle. 

 In figure 17 the line of short dashes represents this formula. Evidenth' 

 the empirical part of the formula, containing the secular increase of 

 1.58 millibars per year, makes the formula unsafe for extended extra- 

 polation until it can be adequately explained ph\'sically and quantita- 

 tively verified. 



Figure 13 showed the values of at corresponding to yearh" average 

 temperatures and salinities for various levels from the surface to 1,000 

 meters. Using these values, we can compute yearly average dynamic 

 heights of the Labrador Current. If we assume constant conditions in 

 the waters immediately adjacent to the Labrador Current, then fluctua- 

 tions in the results of a second depth integration would represent some- 

 thing more than half of the fluctuations in volume of flow corresponding 

 to the long period changes in density-. These fluctuations in volume of 

 flow are shown in figure 17 h\ the line of dots. It will be seen that this 



24 



