time never exceeded 2 hours) in 150-milliliter glass bottles with ground 

 and lapped glass stoppers. The sodium thiosulfate solution was 

 standardized daily with a previously prepared potassium bi-iodate 

 solution. Aliquot samples of the treated sea water were withdrawn 

 by a 50-ml. automatic pipet and titrations were made with a 10-ml. 

 microbm-ette. The precision is generally considered to be ±0.03 

 ml. /liter. 



The question mentioned in Bulletin 48 of this series regarding the 

 validity of the oxygen solubility values of Truesdale, et al.,^ still 

 persists. Because of strong belief by many personnel of the Woods 

 Hole Oceanographic Institution that more accurate values for solu- 

 bilities may lie somewhere between those of Fox** and Truesdale 

 et al., and presumably closer to Fox's the oxygen solubilities for the 

 1963 season were computed according to Fox. When comparing the 

 percent saturation for 1963 with that for 1961 and 1962, consideration 

 must be given the fact that the solubility values of Fox are higher and 

 therefore the percent saturation will be lower. 



Programs in Fortran for use on the digital computer of the Woods 

 Hole Oceanographic Institution were prepared for computation of 

 sigma-t, specific volume anomaly, dynamic height integration, for 

 interpolation of salinity and temperature at standard depths, for 

 determination of the amount of dissolved oxygen in milliliters per 

 liter, for the computation of percent oxygen saturation based on Fox, 

 for correction of reversing thermometers, and for determination of 

 thermometric depths. Each of the above programs was used for data 

 from the Labrador-Greenland section of the postseason survey with 

 the exception of the dynamic height integration, which was used for 

 data from the postseason Bona vista triangle. 



Figures 20 through 24 show chronologically the dynamic topography 

 found during the four surveys made during the season and the post- 

 season occupation of the Bonavista triangle. As in past years the 

 reference surface used was that of 1,000 decibars. The topography 

 found during the fu'st survey, figure 20, shows a Labrador Current 

 that is well defined from section T, south along the eastward slope of 

 the banks to the Tail of the Banks where it makes a westward turn, 

 flowing across the deeper slopes of the Tail of the Banks. There is 

 some slowing of the surface current as noticed by the spreading at the 

 southeast corner of the Tail; however, the warmer temperatures at 

 station 8409 offer no trace of Labrador Current water there. The 

 Atlantic Current south of the Tail turns to the right as it approaches 

 the shoaling bottom; northeast of the ridge it heads north at 42° N. 

 but then veers to the east near 44° N. The mixed water found 



3 Truesdale, G. A., A. L. Downing, and G. F. Lowden. The solubility of oxygen in pure water and sea 

 water. J. Appl. Chem. Vol. 5(2), pp. 53-62, 1955. 



* Fo.x, C. J. .7. On the coefficients of absorption of nitrogen and oxygen in distilled water and sea water 

 and of atmospheric carbonic acid in Sea Water. Faraday Soc. Trans., Vol. 5, pp. 68-87, 1909. 



47 



