Greenland Current was made up of an East Greenland Current com- 

 ponent having a constant mean temperature of 3.2° and an Irminger 

 Current component having a constant mean temperature of 5.5°. 

 While the mean temperatures of the components probably are not 

 constant and their means may differ from these values, the method 

 gives a first approximation which is useful in studying the changes 

 at this section, both seasonal and year to year. In figure 28 the 

 similar figure shown in Bulletin No. 35 has been brought up-to-date 

 presenting, on these assumptions, a curvilinear representation of the 

 tentative normal seasonal variation in the volume transport of the 

 West Greenland Current and its components at this section, consider- 

 ing the occupation by Meteor in March 1935, that of Godthaab in 

 May 1928, that of Marion in September 1928 and all occupations by 

 General Greene and Evergreen at various dates from June to August 

 during 8 different years from 1931 to 1941 and 15 different years from 

 1948 to 1962. 



Figure 29 is a schematic representation of the normal circulation as 

 of 1 July in terms of volume transport deduced from the tentative 

 normal seasonal variation relationships discussed above. The broken 

 line indicating the offshore recurvature southeastward of 1.6 million 

 cubic meters per second of the West Greenland Current passing the 

 Cape Farewell section neglects any exchange through Hudson Strait 

 or the northern openings to Baffin Bay. It also neglects any net 

 vertical transfer across the reference surface. Losses from and gains 

 to the volume transport of the Labrador Current have been deduced 

 from consideration of the differences in mean temperature and in vol- 

 ume transport from section to section. At the Bonavista triangle the 

 values for the mean triangle have been used, thus neglecting any 

 possible upwelling in the triangle. One consequence of this is to call 

 upon the Gulf of St. Lawrence for a net outflow through the Strait 

 of Belle Isle of 0.4 to make up the difference between the volume 

 transport passing the South Wolf Island section and that passing the 

 Bonavista triangle. If the individual sections of the triangle were 

 used instead of the mean triangle the difference required from the 

 Strait of Belle Isle would be only 0.2. Between sections U and W the 

 decrease in volume amounts to about a million cubic meters per second. 

 The thermal alteration which occurs between these sections is so 

 marked, however, as to indicate some larger loss by recurvature, with 

 a partial replacement by much warmer water from the area south- 

 eastward of the Tail of the Banks. The volume of this replacement 

 has been estimated as 1 million cubic meters per second for the purpose 

 of constructing figure 29 in which question marks indicate this 

 estimation. 



50 



