The 1-4 July survey of 3 oceanographic sections (figure 24) 

 compared reasonably well with the June normal dynamic topography 

 chart, thus the previous month's average current values were 

 assumed in the entire Grand Banks area and continued for the 

 remainder of July. 



The remaining figures (25-27) are 60-mile squares of 

 concentrated oceanographic stations for the previously mentioned 

 Labrador Current model. The resulting dynamic topography is 

 very detailed, as expected, and does not compare well with 

 either the June normal nor the contours obtained from the much 

 wider spaced stations surveyed 1-4 July. They do point out 

 three very important factors. First, the closer the oceano- 

 graphic stations, the greater the detail, but the smaller the 

 area that can be surveyed in the same amount of time. Second, 

 the greater the station spacing, the larger the area that can 

 be surveyed, but the dynamic contours are more averaged - 

 producing a chart with less defined features. Finally, each 

 of these special surveys exhibits different dynamic contours , 

 and although they are spaced only four days apart, they indicate 

 a rapidly changing surface current structure. 



The above discussion was based on preliminary data collected 

 during the surveys. A more detailed analysis of the oceano- 

 graphic conditions of the Grand Banks in 1973, including water 

 temperatures, geostrophic currents, and volume transport will 

 be published in the U.S. Coast Guard Oceanographic Report 

 series, CG-373. 



-15- 



