a gradual cooling and an increase in density which results in sinking. 

 This water is depicted by a T-S diagram (Figure 29). Residual Water 

 is exhibited at station 13 with a sigma-t of 28, a temperature of 

 -1.75°C, and a salinity of 34.76%o. The isolated nature of the East 

 Noyaya Zemlya Trough restricts mixing with other water; therefore, 

 the coldest temperatures observed on this survey were found in this 

 trough. 



29 30 

 SALINITY •/.. 



34 

 of Stat 



35 

 Ions 



FIGURE 29. Temperoture/Sallnity Diagram for a Selected Line 

 (Cross Section C-C', see Figure A-1) 



F. Water from the Laptev Sea. 



Current measurements at the western entrance to Proliv Vilkitskogo 

 indicated a continuous inflow into the Kara Sea from the Laptev Sea. 

 The surface current, measured by ice movement, averaged 0.5 knot, 

 and the bottom current, measured by a current meter, averaged 0.2 

 knot V7ith a range of to 0.3 knot. Measurement of various parameters 

 (Fig. 10) at the start and finish of the current station allowed 

 an examination of this water; temperature at depth approached -l.A°C 

 and salinity was 34.4 %o . A T-S plot (Fig. 8) shows that the bottom 

 water at station 104 closely approximated that of station 90 indicating 

 inflow of similar water north of Severnaya Zemlya. Also, Russian 

 sources (Zenkevitch, 1963) suggest the Laptev Sea to be the origin 

 of fauna found in Proliv Vilkitskogo. Zenkevitch also notes that 

 the second route for the penetration of fauna from the central part 

 of the Arctic Basin into the Kara Sea ".. .passes .. .through the northern 

 deep part of the Laptev Sea and through the deep. . .Vilkitsky Strait 

 [Proliv Vilkitskogo]...". 



44 



