Figure 36. — Schematic diagram of currents crossing the meridian of 50° 15' W., 

 south of the Grand Banks. 



proximatioa of E + C for 1950. In that year E + C + B was available 

 but B was completely south of tlie section. The mean value of B for 

 1938, 1958 and 1960 was subtracted to derive E + C for 1950.^ Bearing 

 in mind the large luicertainty in this value it is still of interest to note 

 that while there has been no consistent change in E + C, for the three 

 occupations 1950, 1958 and 1960, for which separate values of E and 

 C can be deduced, there has been a continued decrease in the northern 

 component E aud an increase in the southern component C. The 

 tabulation shows a small negative value for G in 1960. This means 

 that D was greater than E and is further interpreted to mean that D 

 included the eastern part of a closed coiuiterclockwise eddy having 

 a volume transport of this difference between D and E. The gross 

 value of A has been reduced by the amount of this difference to derive 

 the tabulated value of A. 



As in 1958 the volume transport of F, referred to tlie 2,000-decibar 

 surface is larger than when referred to the 1,000-tlecibar surface. The 

 larger value has been used in this tabulation to permit the use of a 

 common reference surface in the construction of the velocity profile 

 shown in figure 37 and used in graphical determination of heat trans- 

 ports of the various components. The components shown in figure 36 

 have been interpreted as being made up of the following components 

 shown in figure 37: F=Vi; E = Y2 + Vi — Vi; D = V2— V3; A=V4 — Vg 

 -(D-E); B = V4-eddy between 7301 and 7300; C = A-D-B. The 

 heat transport expressed as millions of cu. m°C/sec and mean tempera- 

 ture of the contribution of the Atlantic CiuTcnt to the eastward of the 



5 A fifth value of E + C may be approximate'! from the 1937 postseason cruise in which the net volume 

 transport between stations 2475 and 2486 (southeastward of tlie Tail of the Hanks) was computed to be 

 52.3 X 10« cu.m/sec. As the Labrador Current between stations 2471 and 2475. computed as 3.0 X IQs 

 cu.m/sec, recurved as a part of the northeasterly flow between stations 2475 and 248fi. the net contribution 

 of the Atlantic Current to the eastward of the Grand Banks (K+C) was equal to or greater than (52.3—3.0) X 

 109=49.3 X 106 cu.m/sec. 



591759—61- 



57 



