136 



not be considered to be solely the result of contributions from the 

 north but from the Labrador and Greenland margins of the basin as 

 well. Attention is again dh-ected to figure 54 from which it will be 

 seen that the thickness of this temperature maximum layer is much 

 greater nearer the Labrador side than it is at station 2822 (wliich 

 station also forms the end of the longitudinal section). As it has 

 been shown also that the mixed water formed by these processes 

 slowly moves cyclonically with the parent currents it is understand- 

 able that the cross-sectional area of this water of the temperature 

 maximum is greater on the Labrador side than on the Greenland side. 

 Simdarly the intermediate temperature minimum may be looked upon 

 as indicating water of least activity. 



SUMMARY 



1 The four current surveys of the Ice Patrol area in the vicinity 

 of the Grand Banks, made during the 1938 season, have been described. 



2 Computations have been made and the results presented to show 

 the seasonal variation of the Labrador Current during 1938 as com- 

 pared with similar variations found during the previous four ice 



seasons. i t u i 



3 The boundary between Atlantic Current water and Labrador 

 Current water, based on the horizontal projection of the course of 

 the zero salinitv anomaly at the intermediate salinity anomaly max- 

 imum, was investigated, but found to be outside the limits of the 1938 



surveys. , ^^ . i • ^^ 



4 A section across the Gulf Stream near the fiftieth meridian, 

 occupied during June 1938, has been discussed with respect to volume 

 of flow, heat transport, and mean temperature. 



5 Quantitative consideration has been given an actual section with 

 regard to the magnitude of the effect of a storm-produced, hypotheti- 

 cally uniform, vertical mixing of the upper 100 meters. 



6 The circulatory system of the upper layers of the Labrador bea 

 has been discussed from the standpoint of volumes of flow, mean 

 temperatures and heat transport values derived from measurements 

 made during 1938 on sections across the Labrador Current off South 

 Wolf Island, across the West Greenland Current off Cape Farewell, 

 across the west-flowing branch of the West Greenland Current south 

 of Davis Strait Ridge, and across a part of the Baffin Land Current 

 and the West Greenland Current at Davis Strait. ^ 



7 New data on the oxygen distribution along a longitudinal sec^- , 

 tion through the northern part of the Labrador Sea are presented and 1 

 discussed with relation to the source of the bottom water of tlie 



Labrador Sea. , i • xi moo 



In the following table are given the data collected during the 1938 



season and post-season cruises. The individual station headings give 



