measured X-dial readings, m, for water of known salinity permitted 

 deriving new values for A and C in the formula 



S=-^ — O 



This resulted in the following numercial expression: 



200. 2+m 



For a salinity of about 35°/oo, the new expression gives a salinity 

 approximately 0.015°/oo lower than the expression used at the be- 

 ginning of the 1963 season. It would be difficult to say when this 

 change had occurred and if it was a gradual or an abrupt change. 

 Because of the uncertainty involved, no changes connected with this 

 new curve have been made to 1963 data. 



In Bulletin 48 of this series, mention was made of the acquisition 

 and performance of one inductive salinometer constructed in Sydney, 

 Australia. At the completion of the duplicate salinometer runs in 

 September 1962, the instrument began a drift that is still uncorrected 

 and that has rendered it nonoperational. In December 1962, four 

 inductive salinometers manufactured by Hytech, San Diego, Calif., 

 were received. Various of these were tested and used aboard both 

 the CGC Casco and CGC Evergreen. When running warm water 

 samples aboard Casco on station off Bermuda, no drift from bubbles 

 was noted; however, when running cold water samples aboard Ever- 

 green on station in the Labrador Current, many bubbles in the cell 

 caused a drift. It was observed that when the Labrador Current 

 (—1° C.) water came to equilibrium with the lab temperature (20° C), 

 many bubbles of dissolved gas formed on the interior walls of the citrate 

 of magnesia bottles used to store the samples until run on the bridge. 

 After shaking the bottle vigorously, there were no bubbles noticed in 

 the cell to cause drift. There was so little change between the sea 

 water temperature off Bermuda (18° C.) and lab temperature that 

 such bubble effect was not present. There have been difficulties with 

 either the electronic or mechanical sections of the salinometers and so, 

 of the four, only three are presently operational. 



Dissolved oxygen determinations were conducted as in 1961 and 

 1962 according to the method described by Jacobsen, J. P., et al.,^ 

 as modified slightly by the Woods Hole Oceanographic Institution. 

 Samples for dissolved oxygen were taken at all levels except the surface 

 from station 8728 through station 8749. Nansen-type water bottles 

 with Teflon-coated interiors were used for all oxygen sampling. The 

 samples were chemically treated and stored until analysis (storage 



2 Jacobsen, J. P., Rex J. Robinson, and Thomas G. Thompson. A review of the determination of dissolved 

 oxygen in sea water by the Winkler method. Union Geodes. et Geophys. Int., Assoc. d'Oceanog. Phy., 

 Pub. Scientif. No. 11, 1950. 



46 



