ABSTRACT 



Oceanographic data from fifteen cruises on Ocean Station DELTA 

 (44°N, 41°W) during the period August 1968 to August 1969 are presented. 

 These data consist of observed and interpolated temperatures and salinities 

 from 257 shallow and 11 deep casts. Analysis of the data on OS DELTA 

 indicates that the North Atlantic Current intrudes on OS DELTA during 

 most of the year. Temperature-salinity (T-S) curves and salinity anomaly 

 analysis indicate the following water masses on OS DELTA : 



• North Atlantic Central water 



• Subarctic Intermediate water 



• Mediterranean water 



• Labrador Sea water 



• A mixture of Labrador Sea water and Northeast Atlantic Deep water 



• North Atlantic Deep water 



The dominating water mass of OS DELTA is North Atlantic Central 

 water. The maximum intrusion of Subarctic Intermediate water on OS 

 DELTA occurred during April to May 1969. Mediterranean water is ob- 

 served as a salinity maximum between 700 and 1100 meters. Labrador Sea 

 water is present throughout the year and may be a layer as thick as 400 

 meters. A water mass of 60% Labrador Sea water and 40% Northeast 

 Atlantic Deep water is indicated by deep potential temperature-salinity 

 curves. North Atlantic Deep water is the dominant deep water mass below 

 3000 meters. 



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