52° 51° 50° 49° 48° 47° 46° 45° 44° 43° 42°N. 



50 



I 100 



I- 



Q_ 

 bJ 

 Q 



150 



200 



1967 



52° 51° 50° 49° 48° 47° 46° 45° 44° 43° 42°N. 



50 



x 100 



Q. 

 UJ 



Q 



150 - 



200 



1968 



Figure 3. — Vertical sections of temperature (° C.) 

 along long. 170° E., spring 1967 and 1968. 



Stream and other water areas. Along 175° W. 

 in May (fig. 5), salinities were lower than 

 32.8%, above 100 m. from about lat. 48°30' 

 N. to 51°45' N. Salinity was 32.7% in the 

 upper water from lat. 51° 15' N. to 51°45' N. 

 The increase in salinity (33.2 and 33.3/<«) in 

 the surface layers near the islands appears 

 to reflect the intrusion of water from the Ber- 

 ing Sea. The temperature structure showed a 

 characteristic of the Alaskan Stream: Water 

 warmer than 4° below 100 m. was north of 

 lat. 50°30' N. The axis of the stream was 

 near lat. 51°20' N. To the south of the warm 

 water (lat. 48°30' N. to 50° N. and from about 



70 m. to 140 m.) was cold water, less than 

 3.5° C, which represents minimum temper- 

 atures of surface waters from the previous 

 winter. 



Along long. 177°30' W. in May, observations 

 of temperature to depths of 200 m., made every 

 9 to 19 km. between lat. 50° N. and 51°30' N. 

 (fig. 6) were useful in defining the precise lo- 

 cation of the stream axis. Water warmer than 

 4° C. (between 100 m. and 200 m.) indicated 

 that the axis of the stream was at lat. 51°16' N. 

 This position was similar to its location on long. 

 175° W. (51°20'N.). 



At long. 164° W. (fig. 7), the salinity and 

 temperature structures were similar to those 



51° 50° 49° 48° 47° 46° 45° 44° N. 



I 

 I- 



CL 



50 - 



IOO 



150 



200 



1967 



51° 50° 49° 48° 47° 46° 45° 44° 43° 42° 41° 40°N 



200 



1968 



Figure 4. — Vertical sections of temperature (° C.) 

 along long. 175° E., spring 1967 and 1968. 



