MEAN TEMPERATURE IN C. 



VOL OF FLOW IN CUM/SEC X 10" 



15 MARCH 



15 APRIL 



15 MAY 



I5JUNE 



15 JULY 



Figure 19. — Normal seasonal variation in volume of flow and mean temperature 

 of the Labrador Current at sections T, U, and W. Curves are provisional 

 and most reliable point on each curve is encircled. 



Th(^ normal curves were then extended in each direction by mean 

 monthly rates of change. Each year in which a section was occupied 

 during two successive months gave a monthly rate of change for that 

 month for that year. The mean monthly rates of change were deter- 

 mined by giving each year equal weight. It is considered that the 

 normal curves thus derived are nearer the true normals than the 1948 

 normals for the month centered around 1 May and are equally as good 

 for other parts of the season. Similar computations were made for 

 minimum observed temperature but are not shown in figure 19 as a 

 normal minimum observed temperature is considered of doubtful 

 significance. 



It is expected that additional data from future occupations of these 

 sections will require changes in the normal curves given here but that 

 the changes will be least hi that part of the season near 1 May. Thus 

 the computed normal values of volume of flow past sections T and U 

 are as follows: 



70 



