ihc Labrador and Atlantic ( "urreiits. the effect of such an ahtionnality 

 oil the departure from normal T-S curves would be great in the case of 

 the mixed water and nil in the case of the Atlantic Current. During 

 the summer of 195U. the volume transport of the West Greenland 

 Current off Cape Farewell was 3.2 million cubic meters per second in 

 excess of its seasonal normal and this excess was contributed l)y its 

 East Greenland Current component. This could have resulted in the 

 stimulation of the Baffin Bay circulation necessary to produce the 

 eff'ect outlined al)ove. The unsatisfactory part of such an explanation 

 of the shape of the curves in figure 29 is that one would expect to find 

 the effect at shallower levels in the Labrador Current water tlian in 

 the mixed water and this is not the case. 



The 1960 curve for Atlantic Current water very nearly coincides 

 willi the normal curve. However, individual levels are displaced along 

 the curve indicating denser water than normal at levels deejier tlian 

 300 meters with ligliter than normal water down to ami inchuhng the 

 300 meter level. To avoid the possibility of overweighting the 1960 

 observations from extra southerly stations, no data were included 

 from stations taken south of 41° X.. during the first survey. 



To show the dift'erences between the nican T S relationships found 

 (Uuing the prewar period of 1934-41 and the postwar period 1948-60 

 the mean curves for })oth periods have been shown in figure 30. The 

 curves for Atlantic Current water are not as specific as those for mixed 

 water and Labrador ( 'urrent water because the data are heavily 

 weighted by the larger number of stations from the outer margins of 

 the current and the small number of cases when surveys completely 

 crossed the Atlantic ( 'urreiit. The salinity minimum at a temperature 

 of about o..5° which seemed chai'act eiist ic of tlie outer margins of the 

 Atlantic Current during the prewar period has not been noticeable 

 during the postwar period. There has been little change in salinity 

 at levels of 800 meters and deeper but above that level the salinities 

 have been higher. Temperatures have been highei' at all levels during 

 the postwar period. 



In the mixed watci' there has been little temperature change above 

 400 meters but the temperatures have increased below that level and 

 salinities have decreased at all levels. In the Labrador Current water 

 also the salinities have decreased at all levels except 200 meters where 

 they remained about tlie same. The water has become somewhat 

 colder at levels above 1.000 meters and warmer at 1,500 meters. 



Figure 31 shows a plot of the values of a^ corresponding to the 

 average temperature and average salinity, for indivi(hial years, of 

 tlie r^abrador Current water foiuid at particular levels in tlie Grand 

 Banks region for the periods 1934-41 and l'.)4S-(l(). This revises figure 

 23 (p. 92) in Bulletin 43 of this series in the light of the salinity cor- 

 rections to the postwar data, and extends the figure to include 1900. 



49 



