The tables show the corrected vahies of salinity, but since the dynamic 

 heights had already been computed and the topography delineated, 

 the tabulated values of a^ have not been recomputed but are the 

 originally computed values to which a flat correction of 0.01 has 

 been applied where a correction of 0.01 °/oo salinity was necessary. 

 Similarly, the tabulated dynamic heights in these instances have 

 been adjusted by a constant correction of 8 mm. The dynamic 

 topographic charts showing the results of the first and second cruises 

 and the first triangle have not been corrected and show topography 

 which is about 8 mm too high. 



The oceanographic work was under the supervision of Ocean- 

 ographer Floyd M. Soule, Avho was assisted by LT. Harry H. Carter. 

 Other assistants in the observational work were "William B. Arndt, 

 aerographer's mate third class; Kaymond "W. Wood, boatswain's 

 mate second class; Francis N. Brown, yeoman third class, and Lydle 

 L. Rickard, boatswain's mate tliird class. 



The seven oceanographic stations occupied during the first cruise 

 are shown in figure 14. Inasmuch as they are disposed in the form 

 of a single section, current patterns cannot be derived from them 

 with accuracy, but the dynamic heights considered with respect to 

 other indicators permit an inference as to the general features of 

 circulation within a limited area bordering the section as shown in 

 figure 14. A von Arx geomagnetic electrokinetograph was in opera- 

 tion along the section and its indications have been taken into 

 account in the preparation of the figure. No negative temperatures 

 were observed, even near the edge of the Grand Banks, the lowest 

 temperature recorded being 1.50° C at a depth of 129 meters at 

 station 3749. The effects of the Gulf Stream system were in evi- 

 dence at station 3753, where water of more than 11° C and cor- 

 respondingly higli salinity was present just below the surface. The 

 currents in this area were weak and indicated little opportunity for 

 bergs to drift as far west as this section. It was concluded, there- 

 fore, that subsequent surveys of the 1949 season need not extend as 

 far westward as this. 



The dynamic topography found during the second cruise is shown 

 in figure 15. As in the first cruise, the indications of the von Arx 

 current meter have been considered in drawing the dynamic isobaths. 

 The figure shows the Labrador Current flowing southward along the 

 eastern slope of the Grand Banks. Southward of the Tail of the 

 Banks the western limit of about 50°25' W. was attained at about 

 42°30' N. Although the velocity of tlie Labrador Current was not 

 great, the oft'shore limit of the southward moving water was well 

 outside the 1,000-fathom curve and the southern limit of the cold 

 mixed water was south of the area surveyed. Thus any bergs enter- 

 ing the northern part of the area in the Labrador Current and not 



56 



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