the observed salinity value was .20°/oo less than 

 the salinity of Iselin's North Atlantic Central 

 water T-S curve at the observed temperature. 



The core of the Subarctic Intermediate water 

 intrusion on any individual station vvould be the 

 most negative salinity anomaly that has the 



temperature and salinity chaTact«ristics as stated 

 by Bubnov. The means and standard deviations 

 of the depth, temperature, salinity, and salinity 

 anomaly of the core of the Subarctic Intermedi- 

 ate water for each cruise on OS DELTA are 

 given in Table 3. 



Table 3. The means and standard deviations of the depth, temperature, salinity, and salinity 

 anomaly of the core of Subarctic Intermediate water found on Ocean Station DELTA, 

 August 1968-August 1969. 



Stations taken with a Salinity-Temperature-Depth (STD) sensor. 



Not all stations on any one particular cruise hadnegative salinity anomalies that 



were indicative of an SAl intrusion. 



The maximum intrusion occurred on cruise 

 D32, April to May 1969 where 38 out of 42 sta- 

 tions indicated Subarctic Intermediate water. 

 This was also the period of the most negative 

 salinity anomalies (Table 3). The STD sensor 

 was used on the cruise thus allowing a continuous 

 monitoring of the water column as it descended. 



The lowest anomalies (—25 to —44) on cruise 

 D32 occurred on eight almost consecutive stations 

 (D32-1, 2, 3, 5, 6, 7, 9, and 15). The mean and 

 standard deviation of the most negative salinity 

 anomalies for these stations was 5.34°Cdz.27 for 

 temperature, 34.668%o±.070 for salinity and 

 628m±63 for depth. These values are very close 

 to what one might expect to find in the area of 

 formation. The mean and standard deviation 

 of the temperatures and salinities of the salinity 

 minimum on OS CHARLIE during the maxi- 



mum formation period of Subarctic Intermediate 

 water in March 1969 was 6.01°C±.36 and 

 34.634 °/oo± .037. Apparently very little mixing 

 had occurred with surrounding water between 

 OS CHARLIE and OS DELTA. The intrusion 

 is very evident as a pronounced salinity mini- 

 mum between 4°C and 6°C on the T-S curves on 

 cruise D32 (fig. 12). 



During January and February 1969, cruises 

 D29 and D30, and July and August 1969, cruises 

 D36 and D37, no Subarctic Intermediate water 

 could be detected at OS DELTA. The T-S 

 curves for these periods (fig. 9 and 10, and 15 

 and 16) were typical of North Atlantic Central 

 water except for some low surface salinities on 

 cruises D36 and D37. This further supports the 

 hypothesis, (Hannon, 1973), that Subarctic In- 

 termediate water is not formed year-round at 

 OS CHARLIE. 



