contours toward the dynamic trough and a 

 high dynamic stand on the Banks, inferring a 

 strong Labrador Current with considerable 

 flow over the northeast corner of the Banks 

 west of section A2. The meander at the tail 

 of the Banks appears to have shifted eastward. 

 The semipermanent meander at 42° N. 45.5° W. 

 appears to have shifted west of its normal 

 position. In June the flow of the Labrador Cur- 

 rent past section A3 appears about normal. 

 However, at the Tail of the Banks a wide slow 

 westward flow appears to have shifted the 

 meander southward. There are indications that 

 the semipermanent meander at 42° N. 45.5° W. 

 was still some distance west of its normal po- 

 sition. 



Temperature and salinity profiles for the 

 standard section on the calibration surveys 

 appear in figures 7 through 9. Differences in 

 the bottom topography of the same sections 

 are due to the navigational difficulty of reoc- 

 cupying the exact same line of stations. Com- 

 parison of the profiles for section A2 shows 

 a slight warming as the season progresses. 

 This was accompanied by a slight freshening at 

 depth and a spreading of less saline water from 

 the Banks eastward. At section A3 the cold 

 core of Labrador Current water was quite small 

 in the first week of April. However, by the 

 middle of May the size of the core, as well as 

 the temperature of the North Atlantic Current 

 water intrusion, had increased considerably. 

 The final survey in June shows a slight decrease 

 in the size of the Labrador Current water core. 

 The salinity profiles at section A3 are charac- 

 terized by a massive influx of fresher water 

 from the Grand Banks onto the continental 

 slope between April and May. This is gen- 

 erally attributed to spring melt and runoff from 

 Newfoundland and Labrador. By June the 

 water had become more saline again. 



Proceeding further south to section A4 pro- 

 files, a core of Labrador Current water is no- 

 ticeable on the edge of the Banks in April 

 and May. By June, however, the profiles show 

 that warming of water on the Grand Banks and 

 mixing with the North Atlantic Current had 

 caused a considerable rise in temperature. The 

 salinity profile shows no well developed min- 

 imum core in April; however, in May a well 

 developed core of less than 33.0%., is evident. 



The profile for June shows that the salinity had 

 again increased. 



Figures 10 through 21 show the results of the 

 time-series observations of section A3. The 

 left hand edges of the profiles of temperature, 

 sahnity, sigma-t and dynamic height are 

 adjusted to a common base line running be- 

 tween 45-00 N., 49-18 W. and 44-00 N., 49-40 

 W. Comparison of the figures shows details in 

 the time changes occurring throughout the 

 season. These time-series studies indicate that 

 very rapid changes were occurring in the struc- 

 tures of the water. It is not clear whether the 

 observed changes were due to advection of 

 water from the north, or tidal, or other wave 

 effects. 



The expendable bathythermograph profile 

 across the Labrador Current at section A3 is 

 shown in figure 22. An attempt to use this 

 temperature profile with the interpolated sa- 

 linity profile from stations 9907 to 9911 to 

 compute volume flows gave unrealistic results. 

 Making slight changes in the salinity values, 

 which amounted to introducing turbulence into 

 the salinity profile, and using the expendable 

 bathythermograph data gave volume flows 

 comparable to those computed from tempera- 

 tures and salinity data from stations 9907 to 

 9911 alone. This indicates that perhaps spatial 

 turbulence in the temperature and salinity pro- 

 file tends to compensate in such a manner that 

 the density profile remains fairly smooth. 



Figures 23 and 24 show the dynamic topog- 

 raphy and the temperature and salinity profiles 

 from the research cruise. This profile extends 

 into the Gulf Stream and shows temperature 

 and salinity maximums of 26.3° C. and 36.72%o 

 in the vicinity of stations 10026 and 10027. 



The water mass analysis, figure 25, shows 

 the 20 year mean and the 1967 average charac- 

 teristics of the Labrador Current, mixed, and 

 Atlantic Current water masses. Volume flow, 

 heat transport, salinity transport, average tem- 

 perature and average salinity were computed 

 for each station-depth solenoid using the meth- 

 ods described by Kollmeyer (1967). The volume 

 flow, average temperature, average salinity, 

 and minimum temperature of the Labrador 

 Current were calculated for each section and 

 are shown on a time-series plot in figures 26 

 through 29. 



