cross section are nearly synoptic in nature. Analysis of all salinity 

 profiles for this period show an intrusion of higher saline water at 

 depths ranging from 140 meters at station 3 to 70 meters at station 6 

 (Fig. 16). Probably, this intrusion of high saline water originates 

 from the shoal water area surrounding the Tongue. The magnitude of the 

 salinity increase ranges from .39 /00 at station 3 to .08 /00 at station 

 6. A marked halocline exists below the depth of maximum salinity, with 

 gradual decreasing salinity values to depths of 600 meters. For the most 

 part, the halocline slopes generally upward from west to east. 



b. Stations 10, 11 and 12 - As in the southern transect, these 

 stations were occupied during a three to four hour period; and hence, 

 are nearly synoptic. Similar properties can be found in this transect as 

 were found in the southern transect. First, the increase in salinity 

 with depth can be found at each station. TMs salinity increase varies 

 from .26/00 at the western station to .40 /00 at station 11 to .35 /00 

 at the easternmost station (Fig. 17). The depth of maximum salinity 

 ranges from 160 meters at station 10 to 180 meters at station 11 to 



150 meters at station 12. The halocline that exists below these depths 

 is quite marked, with salinity values decreasing gradually. 



c. Stations 15 through 18 - Although the horizontal distribution 

 of sea surface salinity shows little change between stations 14 and 18 

 (Fig. 18), the vertical distribution shows a radical change at each 

 station. As in the previous transects, the intrusion of high saline 

 water can be found at approximately the same depths. For example, at 

 station 15, the increase in salinity from the surface to 190 meters is 



.28 /00. Similar increases can be found at the other stations, with 

 gradients ranging from .31 /00 at station 16 to .37°/00 at station 18. 

 The depth of maximum salinity along this transect is nearly horizontal, 

 ranging from 190 meters at station 15 to 185 meters at station 16, 170 

 at station 17 to 180 at station 18. The salinity decrease below this 

 level is less marked than at the southern transects, and in all obser- 

 vations, salinity values are above 36.00 /00. 



3. Longitudinal Cross Section - Figure 19 has been prepared to show 

 the longitudinal distribution of horizontal and vertical salinity 

 variations in the Tongue of the Ocean. This figure clearly illustrates 

 the general increase in surface salinity values, with highest readings 

 being obtained in the southern portion and lowest values being obtained 

 in the northern portion. It also clearly illustrates the intrusion of 

 high saline water throughout the entire Tongue of the Ocean. Figure 

 19 illustrates that the depth of maximum salinity slopes downward 

 from a least depth of 100 meters at station 1 to a maximum depth of 

 180 meters at station 11. Variation in salinity below these depths 

 appears generally constant. On the other hand, the distribution of 

 salinity above this level varied considerably from north to south. The 

 Tongue of the Ocean appears to be divided into two cells, one being typical 

 of the region between station 1 and station 7 and the other being typical 

 of the area between stations 7 and 18. The isohalines between station 7 



